Consider a gene affected by two transcription factors, U and V. Transcription of the gene takes place in the presence of U alone or of V alone, but when U and V are present together transcription is repressed. This is an example of:
A)epigenetic control.
B)hierarchical control.
C)chromatin remodeling.
D)combinatorial control.

Question

Quizplus · Accepted Answer

This scenario describes combinatorial control, where the presence of different transcription factors can lead to different or opposing effects on gene expression. In this case, U and V can activate transcription individually, but when they are both present, they inhibit transcription. This is a common mechanism for regulating gene expression in complex organisms.

Consider a Gene Affected by Two Transcription Factors, U and V