Choose the one most appropriate answer for each.
-histone
A)a condensed X chromosome
B)protein that combines with DNA all along its length
C)attaches or detaches from operator to regulate transcription
D)portion of the operon that binds RNA polymerase
E)genes that induce expression of other genes
F)genes controlling the development of the body plan
G)the mutated form of this gene is associated with breast cancer
H)binding sites on DNA for regulatory proteins that increase transcription rates

Question

Quizplus · Accepted Answer

Histones are proteins that combine with DNA all along its length, organizing and condensing it into a compact structure.

Answer: H
 Histones have binding sites on DNA for regulatory proteins that increase transcription rates. These proteins can attach or detach from the histones to regulate gene expression.

Answer: A
 Condensed X chromosomes are formed by wrapping DNA around the histone proteins.

Answer: D
 The operator is a region of DNA within an operon that acts as an "on/off" switch for transcription. The promoter is the portion of the operon that binds RNA polymerase, which then initiates transcription.

Answer: G
 Mutations in certain histone genes, such as HIST1H1C, have been associated with breast cancer.

Choose the One Most Appropriate Answer for Each