The charge of the electrical impulses sent from stimuli is extremely positive. Thus, the correct option is A. The net charge of such electrical impulses is positive because of the positively charged ions of the Na+.
What is an electrical impulse?An electrical impulse may be defined as a nerve impulse that contains an electrical signal which travels throughout the body by the axon terminal.
In the resting potential state, the potential difference is -80mV, while after reaching the electrical impulse it changes to +40mV. This happens due to an electrical imbalance between sodium and potassium influx and efflux.
Therefore, the correct option is A.
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Three cells are placed in three solutions of different concentrations. Determine the concentration of the solutions based on the predominant
movement of water molecules through the cells.
isotonic
hypertonic
hypotonic
Solution 2
Solution 1
Solution 3
The three types of solutions and concentrations can be classified as:
Solution 1: HypertonicSolution 2: HypotonicSolution 3: IsotonicWhat is the concentration of a solution?The concentration of a solution must be expressed in quantitative units. So-called concentration units are used, which are quantitative measures of the affinity of solute that dissolves. The relative amount of a substance is known as the concentration and is expressed in different units.
In this case we can classify these solutions as :
Hypertonic solution: has higher osmotic pressure and solute concentration.Hypotonic solution: has lower osmotic pressure and solute concentration. Isotonic solution: the solute concentration and osmotic pressure are equal, thus reaching equilibrium.See more about solution at brainly.com/question/7932885
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A student made a model of a cell. First, she filled a clear plastic bag with gelatin.
Then, she added a rubber ball.
What are two limitations of the student's cell model?
A. The model is not as easy to see and hold as a real cell is.
B. The model does not show that cells can contain smaller structures inside
them.
C.The model does not show how a real cell gets the energy it needs to live.
D.The model is made up of materials that are different from those found in
real cells.
9. Which of the following is a natural pesticide that's sometimes applied to organic crops?
O A. Organophosphates
OB. Nitrogen
C. Neem oil
D. Nitrate
Neem oil is a natural pesticide that's sometimes applied to organic crops because of its repellent composition.
What is natural pesticides?Natural pesticides are those pesticides that are made for their own defense by organisms such as plant, animal, bacteria. Neem has long been used for its medicinal and culinary properties.
So we can conclude that Neem oil is a natural pesticide that's sometimes applied to organic crops because of its repellent composition.
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Neem oil is a natural pesticide that is sometimes applied to organic crops
C. Neem oil
What is neem oil used for in agriculture?It is a product to control the populations of undesirable insects in agriculture, being harmless to humans and warm-blooded animals. It is fully biodegradable and does not bioaccumulate.
With this information, we can conclude that Neem oil is a natural pesticide that is sometimes applied to organic crops
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In what year did Oxford scientist Robert Brown discover the motion of small particles?
1880
1908
1987
1827
Microorganisms are involved in all of the following EXCEPT production of medicinal products. food production. converting nitrogen to a form useful to plants. There are no exceptions here. There are microorganisms that participate in each of these activities. pollution cleanup.
Microorganisms are involved in
a. production of medicinal products.
b.transforming atmospheric nitrogen to a form useful to plants.
c.food production.
d.pollution cleanup.
e.All of the choices are correct.
Microorganisms participate in all the processes mentioned. All of the choices are correct
Economic importance of microbesMicrobes can be beneficial as well as harmful.
Some of the beneficial importance of microbes include:
Production of medicine or medicinal products. E.g penicillin Conversion of atmospheric nitrogen to usable nitrogen forms to plants, otherwise known as nitrogen fixation.Food production. E.g yeast in the production of bread and Lactobacillus in the production of yogurts.Bioremediation of pollutants.More on the importance of microbes can be found here: https://brainly.com/question/17188351
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The typing of human blood is determined by three alleles: A, B, and O. Alleles A and B are codominant to one another and O is recessive to both alleles, A and B.
AA/ AO – type A blood, AB – type AB blood, BB/ BO – type B blood, OO – type O blood.
A woman who is homozygous for type B blood marries a man who is heterozygous for type A.
What is the genotype ratio of their offspring?
What is the phenotype ratio of their offspring?
A female homozygous for blood type B marries a male heterozygous for blood type A, the offspring will be 75% AB and 25% Bo.
What is the genotype ratio of your offspring?AB 75% BO 25%What is the phenotypic ratio of your offspring?75% codominate AB zygotes25% B heterozygous.What is a heterozygous being?Homozygous and Heterozygous, in genetics, are individuals who have pairs of genes that are identical or different alleles. This means that while the homozygote has two identical genes alleles, with the heterozygous beings the opposite happens, since they have two different genes alleles.
With this information, we can conclude that a female homozygous for blood type B marries a male heterozygous for blood type A, the offspring will be 75% AB and 25% Bo.
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Which type of cell transport is used by chloroplasts to make hydrogen (H*) ions move against their concentration gradient?
O A. Exocytosis
O B. Passive transport
O C. Active transport
O D. Diffusion
Answer:
The answer to the question is C
Q2. A student used cubes of potato to investigate the effect of surface area and volume on the rate of osmosis. The diagram shows two of the cubes of potato the student used. lem 2 cm 1 cm 1 cm Cube 1 The surface area to volume ratio of cube 1 is 6:1. Calculate the total surface area of cube 2. (a) 2 cm Cube 2 2 cm
The total surface area of the cube 2 is 24
How to calculate the total surface area of the cube?
The surface area is equal to six times the square of the length of the cube's sides. It is denoted as 6a₂, where an is the cube's side length.
As per formulae of the total surface area of a cube
A = 6a₂
Given a= 2,
A= 6.2.2= 24
Hence the answer is 24.
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As increased global population beneficial or harmful for the climate????
Charles darwin found fossils that looked like ancient versions of living species. From this evidence darwin suggested that earth was.
The fossil that was discovered by Charles Darwin goes a long way to suggest that the earth is older than 6000 years.
Who is Charles Darwin?The man Charles Darwin is the renowned proponent of the theory of evolution. According to this theory, living things all evolved from simple life forms many years ago.
The fossil that was discovered by Charles Darwin goes a long way to suggest that the earth is older than 6000 years.
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How does the white-tailed deer overpopulation affect the ecosystem
What occurs during the mitosis stage of the cell cycle?
Answer:
The dna Seprates into two
Explanation:
also the cytoplasm divdes causing it to create two whole new cells
I need help with this
Energy in this ecosystem passes directly from the sun to.
Answer:
Through photosynthesis, certain organisms convert solar energy (sunlight) into chemical energy, which is then used to build carbohydrate molecules. The energy stored in the bonds to hold these molecules together is released when an organism breaks down food. Cells then use this energy to perform work, such as movement.
Explanation:
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What process creates mRNA?
Fruits grown in hot climates are usually less sweet than those grown in cooler temperatures
Increased respiration in the leaves and stems reduce the sugar content in the fruits of a plant because sugars produced in the leaves are used as an energy source instead of being stored in fruits.
What is fruit?
A fruit is a mature, ripened ovary, along with the contents of the ovary. The ovary is the ovule-bearing reproductive structure in the plant flower.
Cellular respiration is the process wherein nutrients (glucose) are oxidized into carbon dioxide and water with release of lots of energy. The released energy is stored in form of ATP which serves as energy currency for cells. Since high temperatures increase the rate of respiration in the plants, sugars produced in the leaves are used as an energy source instead of being stored in fruits.
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In terms of natural selection what is the best description of an organism that is fit
Answer:
The organism is physically stronger than competing organisms.
Explanation:
Which of the following best describes the contributions of Robert Remak to our understanding of cells?
*
a. developed the first compound microscope to view cells
b. observed the first prokaryotic cells in pond water
c. coined the term "cell" when looking at cork under the microscope
d. obeserved cell division under the microscope proving cells come from other cells
Answer:
a)A dutch father-son team named hans zacharias janssen invented the first so called compound microscope in late 16th century when they discoveted that if they put a lens at the top and bottom of a tube and looked throught lit , objects on the other and became magnified
b) leeuwenhoek the first prokaryotic cells in pond water
Before harvesting your vegetables,Why is it important to check first the maturity?
Answer: The quality of vegetables does not improve after harvest so it is important to gather crops at proper maturity. At this point vegetables are at their peak for flavor and nutrition.
Explanation:
The gene theory declares that all organisms contain coded information in __________ which dictates the form and function of organisms
The gene theory declares that all organisms contain coded information in DNA which dictates the form and function of organisms.
What does the gene theory state?Gene theory is one of the major principles of biology that explains the inheritance of traits coded by gene from parents to offspring.
This theory further explains that genes are located on chromosomes and consist of DNA, which stores them.
Therefore, the gene theory declares that all organisms contain coded information in DNA which dictates the form and function of organisms.
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How would you explain Darwin's mechanism for evolution called "natural selection"?
Uranus was originally thought to be the star Sagittarius A*.
True
False
Answer:
I think it's true
Explanation:
I'm so sorry if that's wrong
Lidocaine is an anesthetic that is used to prevent the propagation of action potentials. Which compartment would lidocaine MOST likely target
Large areas of forest have been cleared for construction of subdivisions in the region encompassing Ohio, Indiana, Illinois, Michigan, and Wisconsin. How will the region's climate be affected? (4 points)
A. Deforestation does not affect climate.
B. Deforestation increases the frequency of extreme summers in tropical regions.
D. Deforestation decreases the frequency of extreme summers in tropical regions.
C. Deforestation increases the frequency of extreme summers in the Midwestern United States.
Deforestation increases the frequency of extreme summers in the Midwestern United States.
What is deforestation?Deforestation is the process whereby large forests areas are cleared without replacing the trees that were cut down.
Deforestation affects the climate of an area and leads to increased temperatures and global warming.
Therefore, Deforestation increases the frequency of extreme summers in the Midwestern United States.
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In the Japanese four o’clock flower, red flower (RR) color is incompletely dominant over white flower (rr) color; the heterozygous plants have pink flowers (Rr). What kinds of offspring can be produced if a red-flowered plant is crossed with a pink flowered plant?
What is the genotype ratio of this cross?
What is the phenotype ratio of this cross?
If a red-flowered plant is crossed with a pink flower plants, the genotype ratio would be 1:1 for RR and Rr, and 1:1 for red and pink flower phenotypes.
Monohybrid crossingRed trait has the genotype RR.
Pink trait has the genotype Rr:
Crossing both:
RR x Rr
RR Rr RR Rr
Thus, only RR (red flower) plants and Rr (pink flower) plants are produced.
Genotype ratio = 1RR : 1Rr
Phenotype ratio = 1 Red flower : 1 Pink flower
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Why are plants called producers
Answer:
they make there own good which creates energy for them to survive, grow and reproduce
Describe 2 causes of variation in humans
The two main causes of variation are "mutation" and "genetic recombination".
A mutation is a change in the DNA sequence of an organism. Mutations can result from errors in DNA replication during cell division, exposure to mutagens or a viral infection.
Genetic recombination refers to the rearrangement of DNA sequences by the breakage and rejoining of chromosomes or chromosome segments.
Answer:
The two main causes of variation are mutation and genetic recombination in se.xual reproduction.
Explanation:
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Runoff from a uranium mine stockpile has contaminated the surface water in a location. This might cause health problems among people in the location. Which of these is the best plan to solve this problem? (4 points)
Plant trees around uranium mines to absorb contaminants.
Put fences around uranium mines to check the flow of contaminants.
Wear protective clothing for prevention against harmful effects of radiation.
Collect the runoffs in retention ponds for isolation and recovery of contaminants.
The best best plan to solve the problem of contamination in the surface water is to collect the runoffs in retention ponds for isolation and recovery of contaminants.
What is surface runoff?Surface runoff is an overland flow of excess water (with or without accumulated contaminants) that cannot be absorbed by the ground as infiltration.
According to this question, runoff from a uranium mine stockpile has contaminated the surface water in a location. This might cause health problems among people in that region.
However, one way to curb the problem of contamination in the surface water is to collect the runoffs in retention ponds for isolation and recovery of contaminants.
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Autopsy results from people who have died of fatal familial insomnia show evidence of degeneration in the
According to the research, autopsy results from people who have died of fatal familial insomnia show evidence of degeneration in the thalamus.
What is fatal familial insomnia?It is an autosomal hereditary disease that prevents falling asleep, that is, it is an absolute inability to fall asleep or to do so in an extremely superficial way.
Its onset is abrupt and continues to progress until it causes the death of the patient and its main neuropathological manifestation is degeneration of the thalamus, which is responsible for sleep.
Therefore, we can conclude that according to the research, autopsy results from people who have died of fatal familial insomnia show evidence of degeneration in the thalamus.
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A student mixes various molecules needed for DNA replication. When he adds DNA, replication occurs, but each DNA duplex consists of a normal DNA strand paired with numerous segments of DNA that are a few hundred nucleotides long. What has been left out of the mixture
Answer: DNA Ligase
Explanation:
During DNA replication, both the parental DNA strands are separated and act as templates for the synthesis of new strands. The formation of the new strands occurs in only 5'-3' direction and thus both the strands are synthesized in a different manner. One new strand with the template of 3'-5' direction will be synthesized continuously and is called a leading strand. The other strand with the template of 5'-3' direction will be synthesized discontinuously in the form of DNA fragments. These fragments are called Okazaki fragments and the strand is called a lagging strand. DNA ligase connects these fragments later to form a continuous lagging strand.
Therefore, DNA ligase is required for ligation of Okazaki fragments, and in absence of DNA ligase, the ligation of fragments will not occur and the newly synthesized strand will be discontinuous. However, if DNA ligase is not present in the reaction mixture, then the chances are that not all the newly synthesized DNA strands will be discontinuous. Only the DNA molecule with the lagging strand will be in the form of fragments.