Suppose That There Is a Mutation in the Lac Operon

question 11

Multiple Choice

Suppose that there is a mutation in the lac operon that prevents the repressor from binding to the operator.In the absence of lactose (or allolactose) ,the genes of the operon will be _______.In the presence of lactose (or allolactose) ,the genes will be _______.

• A) on;on
• B) on;off
• C) off;on
• D) off;off
• E) None of the above;in both cases the presence or absence of the corepressor would dictate whether the genes are on or off.

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Definitions:

Canalization

A concept in developmental biology and psychology referring to the degree to which the development of an organism is restricted to certain paths by its genes.

Cerebellum

A part of the brain located at the back of the skull, primarily responsible for coordinating and regulating muscular activity.

Cerebrum

The largest part of the human brain, responsible for cognitive functions such as thinking, language, and emotion.

Hypothalamus

A region of the brain that plays a critical role in the regulation of many bodily functions, including temperature control, hunger, thirst, and emotional activity.