View the animation below, then complete the quiz to test your knowledge of the concept.
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1 | |
When glucose is present |
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| | A) | cyclic AMP is high, the catabolite activator protein (CAP) binds to the activator binding site, and transcription of lactose is turned on |
| | B) | cyclic AMP is low, CAP binds to the site activator binding site, and transcription of lactose is turned on |
| | C) | cyclic AMP is high, CAP does not bind to the activator binding site, and transcription of lactose is turned on |
| | D) | cyclic AMP is low, CAP does not bind to the activator binding site, and transcription is turned off |
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2 | |
The lac repressor |
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| | A) | binds to the operator and prevents transcription |
| | B) | binds to the CAP site and prevents transcription |
| | C) | binds to the CAP site and facilitates transcription |
| | D) | binds to the operator and facilitates transcription |
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3 | |
When both glucose and lactose are present |
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| | A) | cyclic AMP is high so transcription occurs |
| | B) | the lac repressor binds with the lactose and transcription occurs |
| | C) | RNA polymerase is able to bind to the operator so transcription occurs |
| | D) | transcription is turned off |
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4 | |
In the absence of glucose, when lactose is present it combines with the repressor, allowing RNA polymerase to carry on transcription. |
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| | A) | True |
| | B) | False |
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5 | |
When both glucose and lactose are absent, transcription occurs. |
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| | A) | True |
| | B) | False |
2008 McGraw-Hill Higher Education