#Question id: 2997
#Unit 2. Cellular Organization
Composed of population of cell that at the same stage of their cell cycle
#Question id: 5562
#Unit 5. Developmental Biology
In an egg cell treated with a chemical that binds calcium and magnesium ions, the ________.
#Question id: 11107
#Unit 7. System Physiology – Animal
Which one of the following is NOT a factor influencing respiratory rate and depth:
#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: 10615
#Unit 10. Ecological Principles
The population size of a bird increased from 600 to 700 in one year. If the per capita birth rate of this population is 0.50, what is its per capita death rate?