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?

Detox Diet Basics

Detox Diet Basics

Our internal organs, the colon, liver and intestines, help our bodies eliminate toxic and harmful  matter from our bloodstreams and tissues. Often, our systems become overloaded with waste. The very air we breathe, and all of its pollutants, build up in our bodies. Today’s over processed foods and environmental pollutants can easily overwhelm our delicate systems and cause toxic matter to build up in our bodies.

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