If a Particular Operon Encodes Enzymes for Making an Essential

question 38

Multiple Choice

If a particular operon encodes enzymes for making an essential amino acid and is regulated like the trp operon, then ________.

• A) the amino acid inactivates the repressor
• B) the repressor is active in the absence of the amino acid
• C) the amino acid acts as a corepressor
• D) the amino acid turns on transcription of the operon

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Definitions:

Blood Plasma

The liquid component of blood where cells are suspended, comprising water, salts, proteins, and various other substances.

Medullary Osmotic Gradient

A concentration gradient of solutes in the kidney's medulla that helps in the reabsorption of water from urine, contributing to the body's water balance.

Loop Of Henle

A section of the nephron in the kidney that is responsible for concentrating urine and conserving water.

Glomerular Filtration Membrane

A selective filtration barrier in the kidneys that separates blood plasma from the filtrate, leading to urine formation.