Question

question 9
rna polymerase will be blocked from transcription if there is no lactose as the operator will be repressed
true
false

question 10
when glucose is present the lac operon should be repressed as the cell doesnt need to metabolize lactose for energy with glucose present
true
false

question 11
the lac operon was one of the first regulatory gene models studied and is found in e. coli regulating lactose metabolism
true
false

Explanation:

• Question 9: Without lactose, the lac repressor binds to the operator, blocking RNA polymerase from transcribing lac operon genes.
• Question 10: Glucose is the preferred energy source; when present, the lac operon is repressed via catabolite repression, so cells don’t use lactose unnecessarily.
• Question 11: The lac operon in E. coli was a foundational model for understanding gene regulation, studied early in molecular biology.

Answer:

Question 9: True
Question 10: True
Question 11: True