An event in a signal transduction pathway that has a direct effect on gene expression is activation of
A) an enzyme by the addition of a phosphate group.
B) a translation factor in the cytoplasm.
C) an enzyme in the cytoplasm.
D) a transcription factor and its relocation to the nucleus.
E) a ribosome to initiate protein synthesis.

Question

Quizplus · Accepted Answer

Activation of a transcription factor and its relocation to the nucleus is the event in a signal transduction pathway that has a direct effect on gene expression. Transcription factors bind to specific DNA sequences and control the initiation of transcription of specific genes. Therefore, when a transcription factor is activated and moves to the nucleus, it can directly affect the expression of target genes by binding to their promoter regions and regulating their transcription.

An Event in a Signal Transduction Pathway That Has a Direct