試題詳解

40. Enzymes that acetylate the s-amino group of lysine in the histidine tails are called_____and are involved in________. 
(A) histone deacetylases； restoring chromatin to a repressed state
(B) histone acety1transferases (HATs)； initial events in transcriptional activation
(C) histone activases； formation of the de-repression complex
(D) Schiff base formation； promoting the formation of closed complexes
(E) None of the above