Question

Which of the following condition will favour synthesis of $\beta$-galactosidase in E. coli cells

• A. Growing them in a nutrient medium containing glucose as a C source
• B. Growing them in a nutrient medium containing glycerol as a C source
• C. Growing them in a nutrient medium containing lactose as a C source
• D. Growing them in a nutrient medium containing some antibiotic into it

Hint:

The lac operon is under dual control:
- Negative regulation via the repressor (derepressed by lactose/allolactose).
- Positive regulation via CAP-cAMP (activated by low glucose).

Answer 1

The Correct Option is C