The lac operon is an example of ________ control in which the presence of an ________ is required for transcription to occur.
A. negative / activator
B. negative / inducer
C. positive / activator
D. positive / inducer
Answer:B
The lac operon is an example of ________ control in which the presence of an ________ is required for transcription to occur.
A. negative / activator B. negative / inducer C. positive / activator D. positive / inducer