A Primary Reason That the Kidneys Have One of the Highest

question 78

Multiple Choice

A primary reason that the kidneys have one of the highest metabolic rates of all body organs is that

• A) they store the body's excess fats.
• B) they have membranes of varying permeability to water.
• C) they operate an extensive set of active-transport ion pumps.
• D) they are the body's only means of shedding excess nutrients.
• E) they have an abundance of smooth muscle.

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Definitions:

Regulatory Sequences

Segments of DNA that are involved in controlling the activity of genes, including when, where, and how much of a gene product is made.

Constitutive

Expressed continuously under normal physiological conditions, not subject to regulation by environmental conditions.

Lac Operon

A set of genes involved in the metabolism of lactose in bacteria, along with their promoter and operator sequences that control their expression.

Repressor Protein

A type of protein that binds to specific DNA sequences and inhibits the expression of a gene by blocking RNA polymerase.