Microcheck

End products of biosynthetic pathways typically repress expression of the associated enzymes, whereas substrates of degradative pathways typically induce the expression of the associated enzymes. Signal

Future Challenges transduction allows a cell to respond to changing conditions outside of that cell. The expression of some genes changes randomly, presumably enhancing the chances of survival of at least a subset of a population of cells under varying environmental conditions.

■ Explain the mechanism by which glucose represses the lactose operon.

■ Explain the mechanism by which certain bacteria can "sense'' the density of cells.

■ Why would it be advantageous for a bacterium to be able to synthesize more than one type of homoserine lactone?

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