False, timing of a mutation during development has no negligible effects on the severity of the genetic defect.
Mutation are considered as beneficial, harmful, or neutral, depending on their context or location. Many of the non-neutral mutations are deleterious. In general, if the larger number of base pairs are affected by mutation, the impact of mutation will be greater, and the larger the mutation's probability of being deleterious.
Mutations can also result from errors in DNA replication during cell division, reason can be the exposure to mutagens or a viral infection. Germline mutations can be passed on to offspring, while somatic mutations cannot be transferred.
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PLSSS HELP IF YOU TURLY KNOW THISS
Answer:
B, polluting.
flooding is Natural, documenting wouldn't hurt anything,and photographing wouldn't hurt anything.
Answer:
pollutiong
Explanation:
polluting is when some habitat is getting harmed by a chemical or physical substance such as acid or things like plastic
PLEASE HELP FAST!
Which statement best compares potential and kinetic energy?
A.) Objects always have more potential energy than kinetic energy.
B.) Kinetic energy increases and potential energy decreases when the velocity of an object increases.
C.)Only potential energy decreases when an object’s height increases.
D.) Objects always have more kinetic energy than potential energy.
Dna has two strands. If the sequence of nucleotides of one strand was known, is it possible to use that information to determine the sequence of the second strand? explain your reasoning for your response using an example dna sequence.
Yes, it is possible to identify the sequence of the second strand using knowledge of the nucleotide order of one strand.
The genetic material, DNA, is a double-stranded molecule, meaning it has two strands. A series of complementary nucleotide bases make up the individual strands of each DNA molecule. According to Chargaff's proposed complementary base pairing rule, the bases Adenine (A) and Thymine (T) will always hydrogen pair, whereas Guanine (G) will always pair with Cytosine (C), or A-T, G-C.For instance, if one strand's nucleotide sequence was CTAGCGGATC, the other strand's nucleotide sequence would be GATCGCCTAG. As a result, using the knowledge about the base sequence on one strand, it is possible to infer the sequence of the second strand.
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primary somatosensory cortex as well as many other sensory functions are located in this lobe of the brain.
The parietal lobe contains the postcentral gyrus, a ridge of cortex that houses the primary somatosensory cortex.
What function does the somatosensory cortex perform?The primary somatic nervous system (S1) is essential for processing afferent somatosensory information and helps to integrate the sensory and motor impulses required for dexterous movement.
what is The somatosensory cortex is what, where, ?Brodmann's areas 3a, 3b, 1 and 2 are four separate regions, or fields, that make up the somatic sensory cortex in mammals, which itself is situated in the parietal lobe. All four regions are involved in the processing of tactile input, because although area 3b is typically referred to as the major sensory nerve cortex (also known as SI).
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how do veins differ arteries and capilleries in their structure and function
Hello,
Vascular smooth muscle (VSM), which is present in ALL arteries regardless of size, has a different role depending on the kind of artery. Similar to a stretched rubber band returning to its original size, a major conduit artery like the aorta has a lot of elastic tissue inside of it, which enables it to expand during systole and then elastically recoil to shrink back to its original diameter during diastole. This function smooths out the difference between systolic and diastolic pressures during each cardiac cycle, preventing systemic blood pressure from experiencing as much variation in pressure as the Because of this, we refer to the major arteies as acting as a pressure reservoir.
The VSM becomes increasingly significant as arteries narrow, and by the time you reach the arterioles, the so-called resistance vessels, you have VSM capable of causing significant changes in artery width. This is what regulates blood pressure and blood flow to certain tissues. Both the autonomic nervous system and regional cues from the tissue being fed play a complicated role in controlling artery VSM.
Capillaries are just a single layer of endothelial cells backed by some basement membrane; they lack a VSM and elastic tissue. Due to their extreme thinness, they serve their primary purpose as exchange vessels, which allows for the quick exchange of nutrients, wastes, and gases (O2, CO2). functioning as a pressure reservoir.
Veins serve as a large volume reservoir for the cardiovascular system because they have less elastic tissue than arteries and are more compliant (they stretch easier). In fact, the venous system contains around 70% of all blood volume at any given time. Veins are therefore referred to as "capacitance vessels" for this reason. Veins also have autonomic-controlled VSM that can contract, sending more blood back to the heart so that more can be put into the arterial system—for example, during emergency situations like major blood loss or during exercise. This volume reservoir can be used as needed. Return of blood to the heart (so-called venous return) is also helped by veins' compliance--as muscles contract, they can easily squeeze the veins, to propel blood back to the heart, and their one-way valves ensure that the flow goes one way.
Thanks,
Eddie
Answer:
Explanation:
Arteries transport blood away from the heart. Veins return blood back toward the heart. Capillaries surround body cells and tissues to deliver and absorb oxygen, nutrients, and other substances. The capillaries also connect the branches of arteries and to the branches of veins.
WICH OF THE FOLLOWING SCIENTIST WORK DID NOT CONTRIBUTE TO THE DISOVERY OF STRUCTRE
WICH OF THE FOLLOWING SCIENTIST WORK DID NOT CONTRIBUTE TO THE DISOVERY OF STRUCTRE
So, the appropriate response is "Meselson and Stahl."
Who are the five scientists who contributed?
10 most outstanding minds whose backing the Science Laid Foundation for Modern Technology has received
Max Planck (1858–1947), Ernest Rutherford (1871–1937), Guglielmo Marconi (1874–1937), Alan Turing (1815–1852), James Maxwell (1831–1879), Nikola Tesla (1856–1943), Ernest Rutherford (1871–1937), Guglielmo Marconi (1874–1937), and Michael Faraday (1912-1954)
Why were only three of the four important scholars who made significant contributions to our understanding of the structure of DNA awarded the Nobel Prize?
The molecular structure of DNA was discovered by James Watson, Francis Crick, and Maurice Wilkins, who jointly shared the Nobel Prize in Physiology or Medicine in 1962. This discovery helped to solve one of the biggest biological mysteries.
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how are dtc ancestry databases used in identification of individuals from a dna sample? select all that apply.
These examinations reveal a person's ancestry and can facilitate relationships between individuals and their families.
What distinguishes ancestry based on genealogy from ancestry based on genetics?The natural term for this type of ancestry is genetic ancestry, which varies from genealogical ancestry in that it refers to the subset of routes within your lineage by which the genetic material in your genome has been passed down.
How would one define genetics?Watch your pronunciation. (jeh-NEH-tix) research into genes and heredity. The transmission of genetic features and information from parents to children is known as heredity. These qualities can include eye color and a higher risk of contracting a certain disease.
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need help please
How do organs in the respiratory system work together to allow a fish to take oxygen into its body?
A. Blood enters the heart through blood vessels, where muscles absorb oxygen. B. Water passes over the gills, where oxygen enters tiny blood vessels.
C. Air enters the windpipe through the alveoli, where the filaments take in oxygen.
D. Lymph enters the lymph nodes, where oxygen is absorbed by the blood.
Answer:
B. Water passes over the gills, where oxygen enters tiny blood vessels.
Fish take water into their mouth, passing the gills just behind its head on each side.Hope Helps:)
which processes are driven primarily by energy from the sun
The processes are driven primarily by energy from the sun include the following below:
EvaporationPhotosynthesisTranspiration.What is Photosynthesis?This is referred to as the process in which green plants manufacture food in the presence of sunlight and other compounds. The green pigment which is referred to as chlorophyll is responsible for the trapping of solar energy which is used for the process.
Another process which is driven by the sun is the water cycle which involves the sun heating up the water bodies. This leads to evaporation of water vapor into the atmosphere and undergoes condensation to form precipitation such as rainfall, snow etc.
Plants also undergo transpiration which is the evaporation of water from parts of the plants such as leaves etc thereby making the mentioned processes correct.
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multicellular organisms ensure that most proteins are produced at appropriate times and in appropriate cell types via the regulation of the that encode these proteins.
By controlling the expression of the genes encoding these proteins, multicellular organisms make sure that the majority of proteins are created when necessary and in the right cell types.
Why are the genes that are expressed at any given time in multicellular eukaryotes required to be regulated?Conserving energy and space is achieved through the regulation of gene expression. Since expressing every gene would cost a large amount of energy from the organism, turning on the genes just when necessary would be more energy-efficient.
What controls the creation of proteins?Most proteins can be modified covalently or by joining with other molecules after they have been produced, allowing them to be controlled in response to signals from the extracellular environment. Differential rates of protein cleavage can regulate the amount of proteins in cells.
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drag each of the following labels into the appropriate box to identify which motor division of the peripheral nervous system is identified by the given function.
The peripheral nervous system is simply divided into 2 types, which are the somatic nervous system and the autonomic nervous system.
SOMATIC - Voluntary
principally involved with movement "of" body skeletal muscles activation
AUTONOMIC - Involuntary
lacrimal gland activation
intestinal smooth muscle activation
principally involved with movement "through" body
sweat gland activation
arrector pili activation
can be excitatory or inhibitory on target organ
What is peripheral nervous system (PNS) ?The peripheral nervous system (PNS) is the simply known as the division of the nervous system that has all the nerves that is found outside of the central
centralnervous system (CNS).
Its primary role is to connect the central nervous system to various organs such as the limbs, and skin. simply divided into 2 types, which are the somatic nervous system and the autonomic nervous system.
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If two areas on separate continents have similar climates do they have similar communities Explain your answer
Answer:Yes they are similar.
Explanation:
100 POINTS!!
An organism's ability to maintain balance and stability within its vital internal systems is best referred to as what
process?
Question 6 options:
mitosis
homeostasis
photosynthesis
asexual reproduction
Which helps a paramecium maintain homeostasis in aquatic environments.
Question 7 options:
contractile vacuole
macronucleus
mitochondria
eyespot
Question 8 (4 points)
When placed into a solution that is 30% water and 70% salt, what would happen to a cell that has a 70% water concentration?
Question 8 options:
The cell will maintain its 70% water concentration and remain the same size.
The cell will lose water and shrink to reach equilibrium with the environment.
The cell will take in water and swell to reach equilibrium with the environment.
The cell will maintain its 70% water concentration and swell to allow for some salt to enter the cell to reach
equilibrium with the environment.
Question 9 (4 points)
Which uses energy to maintain cellular homeostasis?
Question 9 options:
passive transport of ions into a cell
movement of a solute from low to high concentration
movement of a solute from high to low concentration
water flowing into a cell until it reaches the same concentration as water surrounding the cell
Question 10 (4 points)
Root cells must pump ions inward so they maintain homeostasis. This is considered what type of transport?
Question 10 options:
passive
diffusion
osmosis
active
Question 11 (4 points)
A student noticed that placing wilted lettuce in a bowl of cool water caused the lettuce to become more crisp and firm.
What is the best explanation for his observation?
Question 11 options:
water moved into the lettuce cells by active transport
water moved out of the lettuce by osmosis
water moved into the lettuce by osmosis
salt moved into the lettuce by diffusion
Question 12 (4 points)
An animal cell with a concentration of 7% dissolved sugars, salts, and other substances is placed in a cup containing a
15% sugar solution.
What would a student most likely observe after 30 minutes?
Question 12 options:
Water molecules will move into the cell causing it to swell.
Water molecules will move out of the cell causing it to shrivel.
The dissolved substances will move out of the cell causing it to shrivel.
The dissolved sugars in the cup will move into the cell causing it to burst.
Question 13 (4 points)
Which factor affects osmosis through a membrane?
Question 13 options:
how fast the carrier proteins move substances through the plasma membrane
how slow the carrier proteins move substances through the plasma membrane
concentration of water on one side of the membrane and the permeability of the membrane
concentration of water on both sides of the membrane and the permeability of the membrane
Question 14 (4 points)
Each beaker shown below contains an amphibian egg collected from one of four different locations.
Which of these beakers contains an egg that would shrink?
Question 14 options:
1
2
3
4
Question 15 (4 points)
A cell with a 10% salt concentration is placed into a beaker that contains a 20% salt concentration. The cell shrinks,
as shown in the diagram below.
which part of the cell controls the movement of substances?
Question 15 options:
mitochondria
cell membrane
chloroplast
nucleus
Question 16 (4 points)
Which component of the cell membrane functions to actively transport molecules into the cell?
Question 16 options:
carbohydrate
cytoplasm
phospholipid
protein
Question 17 (4 points)
What part of the phospholipid is most likely to reject water molecules?
Question 17 options:
hydrophobic lipid tails
proteins
hydrophilic phospho-head
carbohydrate chain
Question 18 (4 points)
A student is given a beaker full of water and a pipette with food coloring. The student dropped the food coloring into the water beaker. The student observed the food coloring beginning to disperse into the water. What process was most likely happening?
Question 18 options:
diffusion
osmosis
active transport
replication
Question 19 (3 points)
In which ways are prokaryotes and eukaryotes similar?
Question 19 options:
They both contain DNA
They both contain a nucleus
They both are highly complex
They both have membrane bound organelles
Question 20 (3 points)
Which function would an algal cell not be able to perform if its chloroplasts removed?
Question 20 options:
cellular respiration
protein synthesis
storage and transport
photosynthesis
The answers include the following below:
An organism's ability to maintain balance and stability within its vital internal systems is best referred to as homeostasis.Contractile vacuole helps a paramecium maintain homeostasis in aquatic environments.When placed into a solution that is 30% water and 70% salt, a cell that has a 70% water concentration will maintain its 70% water concentration and swell to allow for some salt to enter the cell to reach equilibrium with the environment.Movement of a solute from low to high concentration uses energy to maintain cellular homeostasis. Root cells must pump ions inward so they maintain homeostasis which is regarded as active transport.A student noticed that placing wilted lettuce in a bowl of cool water caused the lettuce to become more crisp and firm because water moved into the lettuce by osmosis.An animal cell with a concentration of 7% dissolved sugars, salts, and other substances is placed in a cup containing a 15% sugar solution which will result in the water molecules moving out of the cell causing it to shrivel.The factor which affects osmosis through a membrane is concentration of water on both sides of the membrane and the permeability of the membraneEach beaker shown below contains an amphibian egg collected from one of four different locations.The beakers which contains an egg that would shrink is beaker 3.The part of the cell which controls the movement of substances is cell membrane.The component of the cell membrane which functions to actively transport molecules into the cell is protein.The part of the phospholipid which is most likely to reject water molecules is hydrophobic lipid tails.What is Osmosis?This is referred to as the movement of solvent from a region of lower solute concentration to a region of higher solute concentration through a semi-permeable membrane.
This is responsible for the movement of different types of molecules in and out of the cells.
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Active transport can best be described as:
the movement of molecules against their concentration gradient, from areas of lower concentration to areas of higher concentration.
the diffusion of water from areas where water concentration is higher to areas where water concentration is lower.
the movement of molecules into a cell through phagocytosis and an invagination of the plasma membrane.
the movement of molecules with their concentration gradient, from areas of higher concentration to areas of lower concentration.
Active transport can best be described as:the movement of molecules against their concentration gradient, from areas of lower concentration to areas of higher concentration
What is Active transport?Typically, active transport is linked to the accumulation of significant amounts of substances that the cell requires, such as ions, glucose, and amino acids. Humans' intestines' ability to absorb glucose and plants' ability to absorb mineral ions into their root hair cells are two examples of active transport in action.Through the utilization of cellular energy, active transport involves the movement of molecules across a cell membrane. Passive transport, which uses just kinetic energy to move the molecules, is an alternative to active transport. The movement of molecules or ions across a cell membrane against a concentration gradient, from an area of lower concentration to a region of greater concentration, is known as active transport.To learn more about Active transport refer to:
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Active transport is the movement of chemicals from a low-concentration region to a high-concentration region, going against the gradient of concentration.
What is active transport against the concentration gradient?This procedure is "active" because it uses energy. Passive transport is at odds with it.Carrier proteins are needed for active transport, and they change conformation when ATP hydrolysis takes place.Typical errors and misunderstandingsFacilitated diffusion differs from active transport. Proteins are used to facilitate transport in both facilitated diffusion and active transport. However, active transport moves substances from low-concentration areas to high-concentration areas, working against the concentration gradient. They use various proteins, which is another difference. Listed below.Instead of channel proteins, active transport utilizes carrier proteins. Because they require ATP to change conformation, these carrier proteins are distinct from those observed in facilitated diffusion. Since substances can only pass through channel proteins along the concentration gradient, they are not used in active transport.To Learn more About Active transport refer To:
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chromosomal mutations can affect multiple genes, true or false?
A nucleotide deletion early in the coding sequence of a gene would most likely result in __________.
A nucleotide deletion early in the coding sequence of a gene would most likely result in the production of a truncated or nonfunctional protein.
A nucleotide deletion is a type of mutation in which one or more nucleotides are removed from a strand of DNA. This can occur due to errors during DNA replication or exposure to mutagenic agents, such as radiation or certain chemicals.
If a nucleotide deletion occurs within the coding sequence of a gene, it can affect the sequence of codons along the coding strand of DNA. A codon is a sequence of three nucleotides that encodes a specific amino acid or a stop signal for protein synthesis.
A nucleotide deletion early in the coding sequence of a gene can disrupt the reading frame of the DNA, resulting in the production of a truncated or nonfunctional protein. This is because the deletion will change the sequence of codons, leading to the synthesis of an incomplete or incorrect protein.
For example, if a nucleotide deletion occurs in the first nucleotide of a codon, the resulting codon will be missing its first nucleotide. This will change the sequence of the following codons, leading to the synthesis of an incomplete or incorrect protein.
Overall, a nucleotide deletion early in the coding sequence of a gene would most likely result in the production of a truncated or nonfunctional protein. This type of mutation has the potential to affect the structure and function of the protein, depending on the location and nature of the mutation.
Unlike signal transduction in many other sensory receptors, signal transduction in rods?
results in hyperpolarization of the sensory cell.
does not involve the participation of a G protein.
takes place entirely in the plasma membrane.
involves a second messenger.
Suppose a mutation greatly increases the affinity of a rod’s sodium channels for cGMP, such that once cGMP binds to a channel, it remains bound for much longer than normal. What would be the effect of this mutation on the rod’s sodium channels?
The sodium channels would open and close randomly, regardless of the presence of light.
The sodium channels would remain closed in the light and the dark, even when cGMP decreases after light stimulation.
The sodium channels would remain open in the dark and close rapidly in the light.
The sodium channels would remain open longer, even when cGMP decreases after light stimulation.
Brings about the sense cell becoming hyperpolarized. Even when cGMP drops following light stimulation, the sodium channels would stay open for a longer period of time.
What functions does your body's plasma serve?55% of the total volume of your blood is made up of the liquid substance called plasma. In addition to circulating throughout the circulatory system, plasma is essential for your body's ability to heal after damage, deliver nutrients, eliminate waste, and prevent infection.
Do you benefit from giving plasma?You become more conscious of your food in other ways as well after donating plasma. Additionally, your physical health could benefit from it. The possibility of lowering bad cholesterol levels and raising good cholesterol, particularly in women, is one health advantage of routine plasma donation.
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Which is NOT true about viruses?
A. are very small
B. invade healthy cells
C. contain genetic material
D. are living
Which is NOT true about viruses?
A. are very smallB. invade healthy cellsC. contain genetic materialD. are livingAnswer : D. are living Explanation: As we all know that, viruses are very small that we can't even see them with nakd eyes. To see viruses we need a good microscope. So, option A "are very small" is true. Hence, it is not the answer.Now, we also know that viruses use healthy cells as host and use these cells to produce more viruses which result in killing or damaging healthy cells. So, option B "invade healthy cells" is also true. Hence, it is also not the answer.We know that viruses have genetic materials inside them which are made up of nucleic acid. So, option C "contain genetic material" is also true. Hence, it is also not the answer.Viruses are not living as these are not made up of cells, instead they use cells of other organisms to multiply. So, option D "are living" is not true. Hence, option D is the correct answer of this question.Answer:
d) are living
Explanation:
Viruses are not living cells. They act like dead outside the host body and act like living inside the host body. Therefore, the option (d) is the correct answer.
preganglionic neurons of the parasympathetic nervous system have __________ origin.
The parasympathetic nervous system's preganglionic neurons have their roots in the craniosacral region.
What does a brain what does that do?The basic building blocks of the brain and nervous system are neurons, which are also the cells in charge of processing and relaying electrical signals at each stage of sensory input from the outside world, sending motor commands to our muscles, and receiving sensory input from the inside of our bodies.
Are neurons restricted to the brain?The brain's neurons are the cells responsible for transmitting and receiving electrical and chemical messages. They serve as the brain's building blocks and carry signals to all of the body's tissues, muscles, and other neurons.
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when a stem cell divides, it produces two daughter cells. one daughter cell will remain a stem cell, while the other daughter cell will differentiate into a specialized cell. which factor will most directly determine what type of specialized cell will be produced?
Stem cells is that they undergo asymmetric cell division, results in producing two daughter cells that are different from one another. One daughter remains a stem cell, a process called self-renewal .
Stem cell generally divides into two, were one daughter cell goes on to make specialized type of cell, or even gives rise to several different cell types. While the other daughter cell remains a stem cell, ready to produce more stem cells when they are needed.
Stem cell differentiation involves the changing of a cell to form a more specialized cell structure, that involves a switch from proliferation to specialization.
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the mucous membrane that lines the eyelids and is reflected over the anterior surface of the eyeball is the conjunctiva.
True, the mucous membrane that lines the eyelids and is reflected over the anterior surface of the eyeball is the conjunctiva.
The mucous membrane that lines the eyelid and eye surface is known as the conjunctiva. The conjunctiva is clear and colorless in a healthy eye. The sclera is the eyeball's strong outer coat (the white of the eye).
The sclera is the white covering of tissue that covers and protects practically the entire surface of the eyeball. The conjunctiva is a transparent membrane that covers the front of the eye and lines the inside of the eyelids.
Some organs and bodily cavities have a wet inner lining (such as the nose, mouth, lungs, and stomach). Mucus is produced by glands in the mucous membrane (a thick, slippery fluid). Also known as mucosa.
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What is your opinion? Do you think viruses should be classified as life? __Why or why not?
Which lettered points would you use to show zoe’s voluntary action of choosing to move her leg out of the way? what should the labels be?
Point D is designated for Zoe's voluntarily moving her leg out of the way. The signal that travels down the spinal cord to the skeletal muscle originates at point B. Zoe moves her leg out of the way from point C by using her muscles.
When an action is carried out with the involvement of thoughts, it is referred to as voluntary action.
Usually, the brain is in charge of controlling voluntary actions. These are the deliberate activities that the brain and spinal cord work together to accomplish.
Point D in the scenario stands in for Zoe's voluntarily moving her leg out of the way. The signal reaches the skeletal muscle at Point B after travelling down the spinal cord. Zoe moves her leg away from point C by using muscle.
Point D is the solution as a result.
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A yeast cell is placed into an anaerobic glucose medium. Through which process will the yeast produce atp?.
Cellular respiration, a procedure used by the yeast in your bread, involves the conversion of glucose to ATP and carbon dioxide. The bread rises as a result of the carbon dioxide.
In what manner does yeast make ATP?Another process that can generate ATP without the need for oxygen is fermentation, which differs from anaerobic respiration since it does not involve an electron transport chain. Examples of organisms that employ fermentation to produce ATP include bacteria and yeast.
What is the name of the yeast's anaerobic respiration process?Anaerobic respiration, which occurs in microorganisms like yeast, a unicellular (or single cell) fungus, is known as fermentation. This process results in the production of carbon dioxide and an alcohol variant called ethanol. The fermentation equation is glucose.
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PLEASE HURRY!!!!! NEED HELP ASAP!!!!
Which physical adaptations increase a plant’s chances of growing in grasslands?
(Select all that apply.)
A. having deep roots to survive grazing animals
B. having leaf shapes that do not hold water
C. having waxy leaves
D. having deep roots to survive fires
Answer:
Explanation:
A. having deep roots to survive grazing animals
B. having leaf shapes that do not hold water
D. having deep roots to survive fires
Plants that grow in grasslands must be able to survive in a variety of conditions, including hot temperatures, dry conditions, and frequent fires. In order to do so, they have developed a number of physical adaptations that increase their chances of survival.
One adaptation that helps plants survive grazing animals is having deep roots. These roots can allow the plant to access water and nutrients that are deeper in the soil, which can help it survive even when the surface of the soil has been damaged by grazing animals.
Another adaptation that helps plants survive in grasslands is having leaf shapes that do not hold water. This can help prevent the plant from losing water through evaporation, which is especially important in hot and dry conditions.
Having deep roots can also help plants survive fires, as these roots can allow the plant to access water and nutrients that are deeper in the soil and help it regenerate after a fire.
While having waxy leaves can help some plants retain moisture in dry conditions, it is not necessarily an adaptation that is specific to grasslands.
How are the ages of extinct organisms determined?
O by studying the concentration of radioactive atoms in their fossils
by measuring how much the fossils' appearance has changed
O by studying the hardness of their fossils
O by counting the number of fossils known for a species
Answer:
Second one
Explanation:
Why mitosis is necessary for growth?
In living organisms, mitosis helps with tissue repair and size expansion.
Before mitosis starts, the chromosomes have duplicated and the proteins that make up the spindle of the mitotic cell have been produced. Prophase is when mitosis begins, as shown by the chromosomes thickening and coiling. The nucleolus, an expanding sphere, collapses and disappears.
The commencement of a collection of fibers organizing to form a spindle and the breakdown of the nuclear membrane, respectively, mark the beginning and end of prophase.
Traditionally, mitosis is divided into five phases: Prophase, Prometaphase, Metaphase, Anaphase, Telophase, and Cytokinesis.
Prophase:- Prophase is the initial stage of cell division in both mitosis and meiosis. DNA replication begins after interphase and begins when the cell reaches prophase. The essential processes occur during prophase, including chromatin reticulum condensing and nucleolus disappearing.
Prometaphase:- Prometaphase, the second stage of mitosis, is the division of the duplicated genetic material present in a parent cell's nucleus into two identical daughter cells. Prometaphase is characterized by the breakdown of the nuclear envelope, a protective physical layer around the nucleus.
Metaphase:- Chromosomes enter mitosis, also known as metaphase, during the second most tightly wound and condensed condition of the eukaryotic cell cycle. Before being split into the two daughter cells, the genetically encoded chromosomes align at the cell's equator.
Anaphase:- The mitotic stage known as anaphase follows the metaphase procedure, which divides replicated chromosomes and transfers the freshly copied chromosomes to opposing poles of the cell.
Telophase:- When the chromosomes migrate in opposing directions during the telophase, the process of cell division's last phase, two new cells can be created from a single cell. When a cell completes the process of meiosis or mitosis, it enters a phase where it is effectively getting ready to split into two new cells.
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how rapidly are tropical forests being cleared and degraded and why is such cutting viewed as a serious global environmental problem?
Deforestation refers to destruction of naturally occurring forests, that takes place primarily due to human activities .
Activities includes cutting trees for fuel, burning agriculture, clearing land for livestock grazing, mining operations, oil extraction, dam building, and urban sprawl or other types of urban development and population expansion.
Their are many effects of deforestation that includes loss of trees and other vegetation that have major effects on climate, desertification, soil erosion, flooding, increased greenhouse gases in the atmosphere. It is one of the major environmental concern that may leads to loss of biodiversity, damage to natural habitats, disturbances in the water cycle, and soil erosion.
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the feature on the frontal bone (forehead) that is often used to make a positive identification by comparing antemortem and postmortem radiographs is called the:
By visually comparing the antemortem and postmortem, medical examiners can quickly make a positive identification.
Which of these three intraoral radiograph kinds are they?The upper and lower teeth in one area of the mouth are clearly visible in bite-wing X-rays.
Periapical X-rays display the entire tooth, including the crown, the remainder of the root, and the area of the tooth that is anchored in the jaw.
Full tooth development can be seen on occlusal X-rays, which are bigger.
How are radiographs employed in forensic research?After a firearm explosion or incident, radiographs may show that there are bullets or other foreign objects in the soft tissues. The existence of radio opaque items in the soft tissues after an air crash disaster may shed light on the crash's cause.
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the dna extraction protocol includes the heat inactivation of proteinase k. why is this step necessary? (3 pts)
The step of heat inactivation of proteinase k is necessary so that the DNA samples can be prevented from degradation.
In the DNA extraction protocol, the proteinase k is used at the beginning of the extraction process in order to separate our sample DNA from the entire strand that is not needed.
However, after doing so, the proteinase k has to be immediately inactivated by using heat. This is because proteinase k is an enzyme that degrades DNA by cutting it. Hence, in order for our DNA sample to remain intact and not be cut or degraded, the proteinase k is inactivated by using heat.
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