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
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+
Frequently Asked Questions
What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Lac Operon concept. You can view video lessons to learn Lac Operon. Or if you need more Lac Operon practice, you can also practice Lac Operon practice problems.