The correct answers are:
- Methylation of histone tails in chromatin can promote condensation of the chromatin.
- DNA is not transcribed when chromatin is packaged tightly in a condensed form.
- Acetylation of histone tails is a reversible process.
- Some forms of chromatin modification can be passed on to future generations of cells.
- Acetylation of histone tails in chromatin allows access to DNA for transcription.
Histone modifications are post-translational modifications of histone protein that can affect gene expression by altering chromatin structure or recruiting histone modifiers.The most common modifications are methylation, phosphorylation, acetylation and ubiquitylation. All of them affect the binding affinity between histones and DNA and thus loosening (gene activation) or tightening (gene repression) the condensed DNA.
Histone methylation is a transfer of methyl group by histone methyltransferases to lysine or arginine amino acid of protein. Effect of methylation depends on the type of protein that is modified. Demethylation is the reverse process.
Histone acetylation is the process of adding of an acetyl group(by histone acetyltransferases) to histone proteins and it can also activate or inhibit the gene expression. Deacetilation is reverse process.
Answer:
Yes The cap is present on all roots except those of parasites and in mycorrhizal roots .The roots of aquatic plants have vestigial caps when young but the initial soon die and the cap disappear. The calyptrogen initiate root cap in monocots. In the dicots the cap appears to be a specialized development of the epidermis. In Monocots the cap has attained independent origin.
When the capture starts to increase, the fish population
from 50 capture start to 100 capture start upsurges. At 200 capture start, though,
the population augmented in the beginning up until it touched 300 months where
it significantly dropped.
Numerous environmental factors can affect the populace of
fish. First, when there is a hurricane, the fish population will be affected
because the water will move and change.
Second, pollution. When individuals pollute the ocean, it
affects the fishes’ ability to live.
Lastly, when there is a lot of hunters that feed on fish. This
may cause many fishes to be consumed and their population will be reduced.
The evolution of the jaw contribute to diversification of early vertebrate lineages is It made additional food sources available.
<h3>What is evolution?</h3>
Evolution is the shift in a biological population's heritable traits over successive generations. These traits are the result of genes that are expressed during reproduction and transferred from parent to offspring. Mutation, genetic recombination, and other causes of genetic diversity frequently result in different traits existing within a population. When these variations are subjected to evolutionary processes like natural selection (which includes sexual selection) and genetic drift, specific traits within a population start to become more or less prevalent. This is when evolution happens.
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Sensory neurons and motor neurons are only two of the basic types of neurons. The basic function of neurons are in transmitting nerve impulses to the different parts of our body. Sensory neurons<span> carry signals from peripheral parts of our body into the central nervous system. On the other hand, m</span>otor neurons<span> carry impulses from the central nervous system to the peripheral parts of our body.
Best answer: </span><span>sensory neurons carry stimuli information to the brain; motor neurons carry processed information to muscles and glands. </span>
