The Accompanying Graph Shows a Growth Curve of E

question 2

Multiple Choice

The accompanying graph shows a growth curve of E.coli growing in a defined medium containing equal molar amounts of glucose and lactose. Based on your knowledge of the regulation of the lac operon,the best explanation of these results is that

• A)early on,due to the presence of lactose,the bacteria use the lac operon.Glucose is used later.
• B)the bacteria use both sugars simultaneously.
• C)the presence of glucose causes the formation of cAMP catabolic repressor protein (CR
• P)complexes,which shut down the lac operon until the glucose is used up.
• D)glucose is used first.Once glucose becomes limiting,intracellular cAMP increases,forming cAMP-CRP complexes that activate the lac operon to use lactose.
• E)early on the glucose binds to the repressor protein lacI and shuts down the lac operon.

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Definitions:

Real-time Adjustments

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