Select the two correct statements about the lac operon:(a) Glucose or galactose may bind with the repressor and inactivate it.(b) In the absence of lactose the repressor binds with the operator region.(c) The -gene codes for permease.(d) This was elucidated by Francois Jacob and Jacques Monod.
- A(a) and (b)
- B(b) and (c)
- C(a) and (c)
- D(b) and (d)
Solution & Step-by-step Explanation
(b) is correct: Without the inducer (lactose), the repressor protein binds to the operator, blocking transcription.(d) is correct: Jacob and Monod were the first to elucidate the lac operon model.(a) is wrong because only lactose (allolactose) acts as an inducer.(c) is wrong because the -gene codes for -galactosidase; the -gene codes for permease.