Answer:
Carbon-14 has a half-life of 5,730 years. Taking one atom of 14C, this will either have decayed after 5,730 years, or it will not. But if this experiment is repeated again and again, it will be seen that the atom decays within the half life 50% of the time.
Describe the basic storage mechanism for DNA using the words histone complex, nucleosome, chromatin and chromosome.
Answer:
Chromosomal DNA is packaged inside microscopic nuclei with the help of histones. These are positively-charged proteins that strongly adhere to negatively-charged DNA and form complexes called nucleosomes. ... Nucleosomes fold up to form a 30-nanometer chromatin fiber, which forms loops averaging 300 nanometers in length.
Explanation:
Histones help to package chromosomal DNA inside microscopic nuclei. These are positively charged proteins that bind to negatively charged DNA to form complexes known as nucleosomes.
What are nucleosomes?A nucleosome is made up of about 150 base pairs of DNA rolled up around a core of histone proteins.
The nucleosomes recurrently fold in on themselves to tighten and condense the packaged DNA when forming a chromosome.
Histones help to package chromosomal DNA inside microscopic nuclei. These are positively charged proteins that bind to negatively charged DNA to form complexes known as nucleosomes.
Thus, in this way, DNA gets stored.
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Organism x has an enzyme optimum temperature of 37°C. Organism y has an enzyme optimum temperature of 41°C.
Suppose organism X is infected by organism Y. In response, organism x’s body temperature rises to 40°C. How will this change in temperature affect enzyme activity in both organisms?
It will increase enzyme activity in both organism X and organism Y.
It will decrease enzyme activity in both organism X and organism Y.
It will increase enzyme activity in organism X and decrease enzyme activity in organism Y.
It will increase enzyme activity in organism Y and decrease enzyme activity in organism X.
It is definitely not B. I have already done it once, and b was not it.
elect the correct answer.
You're going to a restaurant for dinner. How can you select healthier foods without giving up on taste?
select a meal with thick sauces
select a grilled or steamed meal
select a fried meal
Answer:
Select a grilled or steamed meal.
Explanation:
Grilling over heat releases fat from meat. Grilled meats are lower in calories than others. Although grilled meats can cause cancer so..
refers to the application of food science to select, preserve, and process food.
Answer:
food technology
Explanation:
As a result of _______________, the incorrect sequence of amino acids will be translated into a protein, resulting in a mutation.
Answer: A
Explanation:
i think its A
Answer:
it is A
Explanation:
I did this on usa test prep
create a poster eduscating your family and your community about kitchen safety
Which part of your brain is responsible for speech?
Answer:
left hemisphere
Explanation:
Answer:
left side or hemisphere, temporal lobes
Explanation:
how big can earthquakes get?
Pls help i dont understand :( Will give Brainliest + 25 Points!!
Answer:
B I think....
Explanation:
ummm.... lmk if I'm wrong.
The cell spends most of its time in the _________________ stage of the cell cycle.
Answer:
Interphase
Explanation:
In Interphase the cell grows and the cells DNA is copied in a process called replication
Answer:
Interphase
Explanation:
If the age structure of a population is on the older side, birth rates tend
to be:
A.Higher than normal
B.Lower than normal
C.Has no effect
The cells found throughout the digestive system all look very similar.
true or false
Answer:
True
Explanation:
In the levels that make up the organization of life, CELLS are the smallest and simplest components of life. According to the hierarchy, cells make tissues, tissues make organs, organs make organ systems, organ systems make organisms. Based on this question, the DIGESTIVE SYSTEM falls under the SYSTEM category of the hierarchy meaning that it comprises of organs performing similar functions that makes it up.
However, these organs as well contain tissues and subsequently cells which makes up the digestive system. Since the cells, tissues, and organs all work together for the process of digestion, it means that the cells found in the digestive system are SIMILAR to one another in appearance.
types of transpiration
Answer:
Types of Transpiration
There are three different types of transpiration in plants:
Stomatal Transpiration
It is the evaporation of water from the stomata of the plants. Most of the water from the plants is transpired this way. The water near the surface of the leaves changes into vapour and evaporates when the stomata are open.
Lenticular Transpiration
Lenticels are minute openings in the bark of branches and twigs. Evaporation of water from the lenticels of the plants is known as lenticular transpiration.
Lenticels are not present in all the plants. A minimal amount of water is lost through lenticels.
Cuticular Transpiration
It is the evaporation of water from the cuticle of the plants. The cuticle is a waxy covering on the surface of the leaves of the plants. About 5-10% of the water from the leaves is lost through cuticular transpiration. During dry conditions when the stomata are closed, more water is transpired through the cuticles.
What forces the fluid from the capillaries of the glomerulus into the Bowman's capsule?
Answer:
Blood pressure forces plasma minus its macromolecules (e.g., proteins) from the glomerular capillaries into the Bowman's capsule, which is continuous with the proximal convoluted tubule.
Use your answer to Question 1 to explain why most communities have only about three or four trophic levels.
Answer: Energy is passed up a food chain or web from lower to higher trophic levels. ... This loss of energy explains why there are rarely more than four trophic levels in a food chain or web.
Explanation:
When standing on the Earth, the Moon and Sun appear to rise in the east and set in the west. What is responsible for this apparent movement of the sun and moon?
Answer:
The Sun, the Moon, the planets, and the stars all rise in the east and set in the west. And that's because Earth spins -- toward the east. ... Earth rotates or spins toward the east, and that's why the Sun, Moon, planets, and stars all rise in the east and make their way westward across the sky.
The Sun, Moon, planets, and stars all rise in the east and travel westward across the sky because Earth rotates or spins in an eastward direction.
What is sun?
The Sun, a 4.5 billion year old yellow dwarf star and the center of our solar system, is a hot, burning ball of hydrogen and helium. It is the only star in our solar system and is located approximately 93 million miles (150 million kilometers) from Earth.
On our home planet, life as we know it would not be possible without the energy of the Sun. The Sun may appear to be a constant source of heat and light in the sky from Earth's perspective.
However, the Sun is a dynamic star that changes frequently and radiates energy into space. Heliophysics is the study of the Sun and how it affects the rest of the solar system. The largest body in our solar system is the Sun.
Therefore, The Sun, Moon, planets, and stars all rise in the east and travel westward across the sky because Earth rotates or spins in an eastward direction.
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The codon chart shown here uses the three base sequence found on the mRNA molecule after the information is
copied from DNA during transcription. If the mRNA message is ACC UAC UGC, what was the original DNA base
sequence?
A)
UGG AUG ACG
B)
TCC ATG ACG
C)
ACC UAC UGC
D)
TGG ATG ACG
What is a bacterial have?
A. Bacteria that destroys DNA
B. virus that causes pneumonia
C. Virus that infects and kills bacteria
Answer:
A.because dna is our blood not sure
Explanation:
Some types of bacteria can cause diseases in humans, such as cholera, diptheria, dysentery, bubonic plague, pneumonia, tuberculosis (TB), typhoid, and many more. If the human body is exposed to bacteria that the body does not recognize as helpful, the immune system will attack them.
the bacteria produce toxins which damage specific tissues in the body. invasiveness – the bacteria multiply rapidly at the site of infection and overwhelm the body's defence mechanisms. The bacteria may then spread to other parts of the body.
Which factor explains that in general, temperate and polar regions have less biodiversity than tropical regions ?
Answer:
The tropical regions are subjected to extreme changes of season. The polar regions were populated earliest in the history of Earth.
Hydrogen bonding allows for:
O adhesion
O cohesion
all of the answers are possible because of hydrogen bonds
O capillary action
Mice learning to avoid traps is an example of what type of tolerance?
a.
digestive tolerance
b.
genetic tolerance
c.
claustrophobia
d.
behavioral tolerance
e.
none of the above
Answer:
d
Explanation:
Answer:
D) behavioral tolerance
Explanation:
"Behavior tolerance results from changes in behavior. for example (choice d)" pg 314 EDGE 7th edition
why is DDT harmful to osprey ?
Answer:
it changes the way it metabolizes calcium, and so the bird can no longer make strong eggs and its bones are weakened.
Explanation:
Hope this helped
does climate change negatively or positively impact ecosystems in a biome?
Answer:
negativity
Explanation:
Answer:
Negatively
Explanation:
Climate change is a rapid change in heat in a ecosytem. This can melt the icecaps, cause fires, or even get rid of lakes.
Pure-breeding pea plants with the dominant long-stem trait were crossed with pure-breeding pea plants with short stems. The F1 generation was allowed to self-pollinate. If the long-stemmed offspring of the F2 generation are test crossed, what fraction of their offspring are expected to have short stems? Select one: a. 3/4 b. 1/2c. 1/3 d. 1/4
Answer:
b
Explanation:
First, let us assume the long-stem trait to be represented by the allele A and its short stem counterpart by the allele a.
Pure-breeding long-stem = AA
Pure-breeding short-stem = aa
AA x aa
F1: Aa Aa Aa Aa
The F1 generation was allowed to self-pollinate
Aa x Aa
F2: AA Aa Aa aa
Test-crossing means crossing an organism of doubtful zygosity with a phenotypically recessive version of the same organism.
From the resulting F2, the long-stemmed offspring are of 2 genotypes - AA and Aa. If AA is test-crossed with a phenotypically recessive version:
AA x aa
Aa Aa Aa Aa
all the offspring are expected to have long stems.
If the Aa offspring is test-crossed with aa:
Aa x aa
Aa Aa aa aa
Half or 1/2 of the offspring are expected to have short stems.
Considering the second cross, the correct option is, therefore, b.
What is the relationship between the respiratory system and the circulatory system?
Question 8 options:
The respiratory system pumps the oxygen around the body from the circulatory system.
The respiratory system tells the circulatory system what to do.
The circulatory system tells the respiratory system what to do.
The circulatory system pumps the oxygen around the body from the respiratory system.
The circulatory system pumps oxygen around the body from the respiratory system. Therefore, option D is correct.
What are the respiratory and circulatory systems?The network of organs and tissues that aids in breathing is known as the respiratory system. It consists of your blood vessels, lungs, and airways. The respiratory system also includes the muscles that propel your lungs. Together, these components help the body circulate oxygen and eliminate waste gases like carbon dioxide.
Blood arteries in the circulatory system move blood away from and toward the heart. Blood leaves the heart through arteries and returns through veins. Cells receive oxygen, nutrition, and hormones through the circulatory system, which also eliminates wastes like carbon dioxide.
Hence, The circulatory system pumps oxygen around the body from the respiratory system. Therefore, option D is correct.
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Based upon your experimental data, which muscle type exhibited the lowest threshold of stimulation in all conditions tested?a. Lower forelimb muscleb. Upper forelimb musclec. Calf muscled. Thigh muscle
Answer:
a. Lower forelimb muscle
Explanation:
The forelimbs are the limbs that are found in the front parts of the body Which includes the arm and its muscles this makes them Different from the hind limbs that are found are the back parts of the body which includes our leg.
Based on the experimental data obtained the lower forelimb muscle displayed the lowest levels of stimulation in all the tests conducted.
Water has the ability to dissolve many
substances. This is due to which property of
water?
Answer:
Polarity
Explanation:
dissolve polar substances very easily, Because of its polarity and ability to form hydrogen bonds, water makes an excellent solvent making it able to dissolve molecules.
HELp I will mark brainlyest if correct
this is on science
The ------------ of a region can affect its day-to-day ----------
what's goes in the blanks???
Answer:
The climate of a region can affect its day-to-day weather.
Based on California’s experience with Caulerpa, the killer algae, explain why it is important to regulate the pet and aquarium trade.
Answer:
Based on California's experience with Caulerpa, the killer algae, explain why it is important to regulate the pet and aquarium trade. Even species that are kept as pets and in aquariums should be regulated and tracked because their accidental release can have serious negative environmental impacts.
Explanation:
Even species that are kept as pets and in aquariums should be regulated and tracked because their accidental release can have serious negative environmental impacts. Some owners and aquarium keepers intentionally release these species into the wild rather than destroy them, and accidental release is always a risk. Therefore, if a potentially destructive species is going to be kept as a pet or in an aquarium they should be regulated so proper safety precautions can be taken.
What would be the correct genotypes if you cross two (2) heterozygous guinea pigs?
HH x Hh
Hh x Hh
HH x HH
HH x hh
hh x hh
hh x Hh
Answer:
Hh x Hh
Explanation:
A capital and lower cap letter represent this.
Two capital letters represent a pure dominant trait.
Two lower cap letter represent a pure recessive trait.
Answer:
Hh x Hh
Explanation:
this popped up for me even tho its month old u m