Question

Amino acid production is commonly regulated by

• A. \( \text{Feedback inhibition} \)
• B. \( \text{Catabolite repression} \)
• C. \( \text{Heat shock} \)
• D. \( \text{Osmotic stress} \)

Hint:

In industrial biotechnology, scientists create "overproducing" strains by mutating enzymes so they are no longer sensitive to feedback inhibition.

Answer 1

The Correct Option is A

Concept: Cells must efficiently manage their resources and avoid the wasteful overproduction of metabolites.
• Metabolic pathways are often organized in a assembly-line fashion.
• Regulation usually occurs at the first committed step of the pathway.

Step 1: The Logic of Feedback.
In the biosynthesis of amino acids, the final product acts as a regulatory signal. When the concentration of the amino acid reaches a sufficient level, the molecules bind to the first enzyme in the chain.

Step 2: Enzyme Inhibition.
This binding is usually allosteric, meaning it changes the enzyme's shape and shuts off its activity. This "Feedback Inhibition" ensures that the pathway stops as soon as the cell has enough of that specific amino acid. Final Answer: The production of amino acids is most commonly regulated by Feedback inhibition.