Term
| The role of a metabolite that controls a repressible operon is to |
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Definition
| bind to the repressor protein and activate it. |
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Term
| The tryptophan operon is a repressible operon that is |
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Definition
| turned off whenever tryptophan is added to the growth medium. |
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Term
| In humans, the hormone testosterone enters cells and binds to specific proteins, which in turn bind to specific sites on the cells' DNA. These proteins probably act to do what? |
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Definition
| help RNA polymerase transcribe certain genes |
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Term
| A gene on human chromosome 15 is expressed throughout the body. However, in the brain, only the maternal copy of the gene is expressed, whereas the paternal copy of the gene is silent and not transcribed. What accounts for this pattern of expression this gene displays in the brain? |
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Definition
| Through genomic imprinting, methylation regulates expression of the paternal copy of the gene in the brain. |
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