Copy of Among the four available choices, which one best describes the following statement: chemical modifications...

Copy of

Among the four available choices, which one best describes the following statement:

chemical modifications on the tails of histones determine whether chromatin is open (decondensed) or closed

	A.	in eukaryotes (euks) only
	B.	in neither proks nor euks
	C.	in prokaryotes (proks) only
	D.	in both proks and euks

When comparing replication and transcription, pick the best answer that describes this property:

in eukaryotes, the new strands are modified by addition of a string of A nucleotides

	A.	both
	B.	transcription only
	C.	neither
	D.	replication only

Expert Solution

Q. Histones are the positively charged proteins that are present only in eukaryotic cells. DNA coils around these proteins for packaging. Acetylation of histone proteins increases the gene expression and deacetylation decreases gene expression. These chemical modifications target gene expression by decondensation and condensation of chromatin.

Prokaryotic cells do not contain histone proteins, so, the process mentioned above is exclusive to eukaryotes.

So, correct answer is (A) In eukaryotes (euks) only.

Q. After trascription in eukaryotes pre mRNA is synthesized. This pre mRNA is further treated to synthesize functional mRNA. Introns are removed by splicing, 5' cap is added and a poly A tail is added to pre mRNA. The process of addition of poly A tail is called poly adenylation. These modifications are called post translational modifications.

No such adenylation happens in case of DNA replication.

So, correct answer is (B) transcritpion only.

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gladiator answered 1 year ago

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