Which of the following is true of a methylation?
A) the particular methylation is passed on in mitosis
B) chemicals in cigarette smoke remove methyl groups
C) methylation is never a random event
D) histones are immune to methylation
E) methylation is always harmful

Question

Quizplus · Accepted Answer

Methylation is a heritable modification to DNA and can be passed on from parent cells to daughter cells during mitosis.

Answer: B 
 Chemicals in cigarette smoke can cause demethylation, or the removal of methyl groups, from DNA. This can lead to changes in gene expression and potential health consequences.

Answer: E 
 None of the answer choices mention that methylation is always harmful, and it is not necessarily the case. Methylation can have various effects on gene expression and cellular processes, some of which may be beneficial.

Therefore, the best choices are A and B.

Which of the Following Is True of a Methylation