The Graph Below Shows a Growth Curve of E

question 9

Multiple Choice

The graph below shows a growth curve of E.coli growing in a defined medium containing equal molar amounts of glucose and lactose.

Figure 23.1
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 utilize the lac operon. Glucose is used later.
• B)the bacteria are utilizing 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)none of the above

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Definitions:

Decision-Making Process

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Departmentalization

The organizational practice of dividing a business into specialized functional areas or departments to improve efficiency.

Span of Control

It refers to the number of subordinates that a manager or supervisor can directly control.

First-Line Managers

Managers at the lowest level of an organization who directly supervise and support the work of non-managerial employees.