Suppose That You Perform an Experiment Where You Construct a Plasmid

question 23

Multiple Choice

Suppose that you perform an experiment where you construct a plasmid that carries a copy of the lac operator region (lacO) but no other part of the lac operon. (The lac repressor can bind to single operator regions.) This plasmid is placed in an E. coli cell, which has a normal copy of the lac operon in its chromosome. When this strain is grown, the number of plasmids reaches about 50 copies per bacterial cell. What is the expected phenotype of such a strain in the absence of glucose?

• A) The lac operon will be turned on even in the absence of lactose.
• B) The lac operon will be turned off even in the presence of lactose.
• C) The lac operon will be regulated normally.
• D) The lac operon will be initially turned on in the presence of lactose but eventually it will be turned off even though lactose is still present.
• E) The lac operon will be expressed only if galactose is added to the Moderate.

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Definitions:

ITQs

Individual Transferable Quotas, a regulatory tool in environmental policy that limits the total allowable catch in fishing, with quotas that can be bought, sold, or leased among fishermen.

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A species of salmon found in the Pacific Ocean, highly valued for its flavor and nutritional content, often considered a delicacy.

Market Price

The going rate at which a service or asset can be sold or bought in the marketplace.

Conservation

The responsible management of the environment and natural resources to prevent depletion and harm, ensuring their sustainability for future generations.