The Lac Regulatory System Is Important to Bacteria Because the Sugar

question 9

Multiple Choice

The lac regulatory system is important to bacteria because the sugar lactose

• A)cannot be made by bacteria unless the genes are turned on.
• B)is the most common source of food;enzymes are needed all the time.
• C)is only rarely available;producing enzymes all the time is costly.
• D)is incorporated into the nucleic acid of the bacteria.
• E)switches the system off and on whether lactose is present or not.

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