Regulation of Gene Expression

AP Biology· difficulty 3/5

The trp operon is <strong> repressed </strong> when

A
$Lactose is abundant (the inducer binds and inactivates the repressor protein)$
B
$Glucose is depleted (cAMP rises and CAP activates transcription at the promoter)$
C
$Tryptophan is abundant (the corepressor activates the repressor, blocking transcription)$
check_circle
D
$Tryptophan is absent (the corepressor cannot activate the repressor protein)$

Explanation

When trp is plentiful, the cell halts trp biosynthesis. Trp itself binds the TrpR repressor, activating it.

Want 10 more like this — adaptive to your weak spots?

Related questions