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Q.
Which one of these substances will repress the lac operon?
KVPYKVPY 2015
Solution:
Glucose represses lac operon. This is because the enzymes to metabolise glucose are made constantly by $E$. coli. When both glucose and lactos are available, the genes for lactose metabolism are transcribed at low levels Maximal transcription of the lac operon occurs only when glucose is absent and lactose is present.