Discussion
Which of the following is false about feedback regulation?
Answer: D
Correct answer: The best example is the biosynthesis of L-isoleucine from L-threonine in bacteria
The threonine-to-isoleucine pathway illustrates feedback inhibition - the end product switching off an enzyme that already exists. The other three statements describe feedback repression, which acts on the gene and reduces how much enzyme is made at all. The two work on different timescales: inhibition in seconds, repression over a generation.
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