View the animation below, then complete the quiz to test your knowledge of the concept.
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1 | When glucose is present |
![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | cyclic AMP is high, the catabolite activator protein (CAP) binds to the activator binding site, and transcription of lactose is turned on |
![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | cyclic AMP is low, CAP binds to the site activator binding site, and transcription of lactose is turned on |
![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | cyclic AMP is high, CAP does not bind to the activator binding site, and transcription of lactose is turned on |
![](/olcweb/styles/shared/spacer.gif) | D)![](/olcweb/styles/shared/spacer.gif) | 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 |
![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | binds to the operator and prevents transcription |
![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | binds to the CAP site and prevents transcription |
![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | binds to the CAP site and facilitates transcription |
![](/olcweb/styles/shared/spacer.gif) | D)![](/olcweb/styles/shared/spacer.gif) | binds to the operator and facilitates transcription |
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3 | When both glucose and lactose are present |
![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | cyclic AMP is high so transcription occurs |
![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | the lac repressor binds with the lactose and transcription occurs |
![](/olcweb/styles/shared/spacer.gif) | C)![](/olcweb/styles/shared/spacer.gif) | RNA polymerase is able to bind to the operator so transcription occurs |
![](/olcweb/styles/shared/spacer.gif) | D)![](/olcweb/styles/shared/spacer.gif) | 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. |
![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | True |
![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | False |
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5 | When both glucose and lactose are absent, transcription occurs. |
![](/olcweb/styles/shared/spacer.gif) | A)![](/olcweb/styles/shared/spacer.gif) | True |
![](/olcweb/styles/shared/spacer.gif) | B)![](/olcweb/styles/shared/spacer.gif) | False |