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:
For survival
Explanation:
All organisms need to adapt to their habitat to be able to survive. This means adapting to be able to survive the climatic conditions of the ecosystem, predators, and other species that compete for the same food and space.
Hope this helps:)
I believe it d<span>. the components of a cell that's not dealing with the environment
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It would be absolutely false to state that in <span>general, the median of a data set is less resistant to outliers than the mean. The correct option among all the options that are given in the question is the second option. I hope that this is the answer that you were looking for and it has come to your desired help.</span>
Answer:
zooplankton feed on phytoplankton, the main producers of the ocean, that provide a strong link for every marine food chain. without these consumers, there would be very little methods for energy to be distributed through the oceans ecosystem and life would diminish within the ocean.
Explanation:
