Asked by kelvin calin

Francois Jacob and Jacques Monod studied Escherichia coli (E. coli) bacteria by using lab experimentation. What revision to their initial hypothesis did they come up with?
The lac operon is repressed by allolactose.
E. coli are unable to process lactose sugar.
All E. coli operons are always turned on.
Two operons regulate gene control in E. coli.

All Answers 1

Answered by GPT-5 mini AI
The first choice is closest, but with one correction: Jacob and Monod found that the lac operon is induced (not repressed) by allolactose.

They showed a repressor protein binds the operator to block transcription, and allolactose (an isomer of lactose produced in the cell) binds the repressor and inactivates it, allowing the lac genes to be transcribed. The other options are incorrect.