lac operon: synthesizes proteins for the metabolism of lactose (lac genes)
• when lactose and glucose are present, lac genes are not expressed
• when only lactose is present, lac genes are expressed
What is the role of glucose in catabolite repression?
a) It increases the levels of cAMP in the cell, stimulating transcription from the lac operon.
b) It decreases the levels of cAMP in the cell, repressing transcription from the lac operon.
c) It represses transcription from the lac operon, causing a decrease in cAMP levels in the cell.
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