Question

francois jacob and jacques monod studied escherichia coli (e. coli) bacteria by using lab experimentation. what revision to their initial hypothesis did they come (a) 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

Explanation:

François Jacob and Jacques Monod studied gene regulation in E. coli. Their work on operons (like lac operon) led to understanding that two operons (e.g., lac and trp) regulate gene control. The first option: allolactose induces lac operon, not repress. Second: E. coli can process lactose. Third: Operons aren't always on. The correct idea from their research is that two operons regulate gene control in E. coli.

Answer:

Two operons regulate gene control in E. coli (the last option among the given choices, assuming the options are ordered as presented: the fourth option textually is "Two operons regulate gene control in E. coli")