Question

Which of the following would not affect transcription in prokaryotic cells?

	A.	Mutation of promoters.
	B.	Mutation of histone acetylases.
	C.	Mutation of operators.
	D.	Inactivation of repressors.
	E.	Mutation of RNA polymerase.

Ubiquitylation of a cyclin marks the protein for destruction in proteasomes.

True

False

Of the two kinds of cell death (necrosis and apoptosis), necrosis is an important part of normal developmental processes.

True

False


Help all of them please

Answer 1

QUESTION 1

In this case, prokaryotic cells do not have histones. This means that histone acetylases are not relevant in the context of prokaryotic transcription. In fact, in order to compress their DNA, they posses small structures called fiber rolls. So, the correct answer is Mutation of histone acetylases

QUESTION 2

True. Once the cyclins accomplish their function during that cell cycle, they will be ubiquitinated and translocated to the proteasome where it will be degraded.

QUESTION 3

False. Generally, necrosis is produced by external factors that will lead to the death of the cell in a non natural way. On the other hand, apoptosis is considered a programmed cell death where cells regulated this process in determined points of the cell cycle and proliferation.