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

Multiple Choice

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.