Lac Operon Video Lessons

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Problem: Which of the following E. coli strains with the lac genotypes will synthesize beta-galactosidase in the presence of lactose?A. lacI– lacP– lacO– lacZ– lacY–B. lacIs lacP+ lacO+ lacZ+ lacY–/lacI+ lacP+ lacO+ lacZ– lacY+C. lacIs lacP– lacO+ lacZ– lacY+/lacI+ lacP+ lacO+ lacZ+ lacY+D. lacI– lacP– lacO+ lacZ+ lacY+E. lacI+ lacP+ lacO+ lacZ+ lacY+

FREE Expert Solution

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


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Problem Details

Which of the following E. coli strains with the lac genotypes will synthesize beta-galactosidase in the presence of lactose?


A. lacI lacP lacO lacZ lacY

B. lacIs lacP+ lacO+ lacZ+ lacY/lacI+ lacP+ lacO+ lacZ lacY+

C. lacIs lacP lacO+ lacZ lacY+/lacI+ lacP+ lacO+ lacZ+ lacY+

D. lacI lacP lacO+ lacZ+ lacY+

E. lacI+ lacP+ lacO+ lacZ+ lacY+

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