#Question id: 2860
#Unit 2. Cellular Organization
Lactose metabolism in E. coli is carried out by two enzymes, with possible involvement by a third. The genes for all three enzymes are clustered together and transcribed together from one promoter, yielding a polycistronic message. These three genes, linked in function, are therefore also linked in expression. They are turned off and on together.
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Negative control |
keeps the lac operon repressed in the absence of lactose. |
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positive control |
keeps the operon relatively inactive in the presence of glucose, even when lactose is present. |
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when all the glucose is gone and lactose is present, a mechanism should exist. |
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is mediated by a factor called catabolite activator protein (CAP), which, in conjunction with cyclic-AMP, stimulates transcription. |
#Question id: 32327
#Unit 1. Molecules and their Interaction Relevant to Biology
If these 2 reactions are happening together the what will the overall free energy of the
#Question id: 10458
#Unit 6. System Physiology – Plant
Which of the following statements is not true for cry proteins?
#Question id: 3961
#Unit 3. Fundamental Processes
If there were a mutation in the regulatory gene of an inducible promoter rendering the protein incapable of binding to the repressor, then
#Question id: 2144
#Unit 2. Cellular Organization
The type of membrane transport that uses ion gradients as the energy source is: