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.
62. I, there is less d.o. Eutrophication causes dead zones (areas where no fish can survive) in the water because the decomposition of the algae requires oxygen. An example of this can be seen in the Gulf of Mexico.
63. A. tempature. Corals depend on a specific tempature for their survival. The change in tempature is the direct cause of corals going into shock and releasing zooxanthellae. It's actually very sad, many of our reefs have died as a result of climate change.
Answer:
This is relatively easy for me to answer from my own knowledge: Invasive species disturb environments by increasing competition and destroying the peace in the ecosystem.
Copied answer
The invasive species are the species who are present in a non native ecosystem. The invasion of These species disturbs the environment of particular system by increasing the competition or destroying the vital component of the ecosystem.
(yes I did copy some words from online sources, but if you want to make your answer seem like it wasn't copy paste, I suggest you use my answer)
Answer:
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Explanation:
Jordan is adopted because if one if your parents has O blood you have O blood
and you cant roulette a blood type and get B