If an Operon Is Regulated by ____ Control, Genes Are

Multiple Choice

If an operon is regulated by ____ control, genes are ____ by a regulatory protein called a ____.

A) positive; on unless they are switched off; repressor
B) negative; off unless they are switched on; repressor
C) negative; on unless they are switched off; repressor
D) positive; off unless they are switched on; repressor
E) positive; on unless they are switched off; activator