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Over [174]
3 years ago
5

Top layer of the leaf that serves as waterproof covering is the​

Biology
1 answer:
Irina-Kira [14]3 years ago
8 0

Answer:

Its covering the Epidermis

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The correct answers are:  

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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.

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What does an H-R diagram relate a star's temperature to?
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a horse has 64 chromosomes and a donkey has 62, using your knowledge of meiosis explain why a cross between these animals produc
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