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chapter 18
gene expression
4
Biology
11/27/2012

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Term
The role of a metabolite that controls a repressible operon is to
Definition
bind to the repressor protein and activate it.
Term
The tryptophan operon is a repressible operon that is
Definition
turned off whenever tryptophan is added to the growth medium.
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?
Definition
help RNA polymerase transcribe certain genes
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?
Definition
Through genomic imprinting, methylation regulates expression of the paternal copy of the gene in the brain.