Question

question 1
if there is a mutation of the repressor, the lac operon will be permanently induced regardless if glucose or lactose are present
true
false

question 2
lactose binds to the repressor and causes a conformational change so it no longer can repress the operon
true
false

question 3
the lac z, lac y and lac a genes are all transcribed separately depending on the environment the cell is in
true
false

Explanation:

Question 1: A repressor mutation may not always cause permanent induction (e.g., some mutations could inactivate the repressor, but glucose still inhibits via catabolite repression).
Question 2: Lactose (as allolactose) binds the repressor, changing its shape so it can’t bind the operator, lifting repression.
Question 3: LacZ, LacY, LacA are part of a single polycistronic mRNA, so they are transcribed together, not separately.

Answer:

Question 1: False
Question 2: True
Question 3: False