The earlier the cell intervenes in the process

The earlier the cell intervenes in the process of protein synthesis, the _______ energy it wastes. Thus, cells will tend to regulate protein synthesis _______.

a. more; at the earliest possible stage

b. more; at all stages

c. more; at the latest possible stage

d. less; at the earliest possible stage

e. less; at the latest possible stage

Helix-turn-helix is a _______ found in a _______.

a. structural motif; promoter

b. structural motif; transcription factor

c. consensus sequence; promoter

d. consensus sequence; enhancer

e. consensus sequence; transcription factor

Actin, which is part of many cellular structures and has several functions, is produced at constant levels in nearly all cells. It is best described as a(n) _______ protein.

a. inducible

b. repressible

c. conditional

d. constitutive

e. regulated

Two identical twins show very similar methylation patterns when they are 4 years old, but these patterns diverged considerably by the time they are 40 years old. What is the most likely explanation for this?

a. It is an effect of different genomic imprinting in the twins.

b. It is due to different alternative splicing in the twins.

c. It is due to the twins experiencing different environments as adults.

d. It is due to different levels of histone acetyltransferase in the twins.

e. It is due to differences the twins experienced in utero.