Practice question

MCQ

Question

Determine the correctness or otherwise of the following Assertion [a] and the Reason [r]. Assertion [a]: Diphtheria exotoxin is an example of A-B type toxin. Reason [r]: The A component of the toxin is released from the hot cell while the B component inhibits protein synthesis and kills the host cell.

Options

Choose one · Correct answer highlighted

Both [a] and [r] are true and [r] is the correct reason for [a] Both [a] and [r] are true but [r] is not the correct reason for [a] Both [a] and [r] are false [a] is true but [r] is false Correct

Explanation

Evidence for enzyme kinetics indicates substrate binding and catalytic efficiency determine reaction rates. Option D aligns with this, as it reflects active-site specificity and regulation, reflecting standard interpretations in biochemistry.

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