試題詳解

21. Which of the following is true of chromatin?
(A) Heterochromatin has more acetyl groups on the histones.
(B) Heterochromatin has fewer methyl groups on the DNA.
(C) Active genes are not bound by nucleosomes.
(D) Sequence-specific DNA binding proteins can only activate transcription.
(E) The chromatin structure on a particular gene may be different in different cells.