2025 · Q89
Which one of the following statements regarding allosteric enzymes is correct?
general-sciencebiology-human-body
- ALike other enzymes, allosteric enzymes also obey Michaelis-Menten kinetics.
- BThe velocity versus substrate concentration graph is a hyperbolic graph, like any other enzyme.
- CThey are always one-subunit enzymes.
- DEach subunit of allosteric enzyme also contains a regulatory site in addition to the active site.
Explanation
Allosteric enzymes do not obey Michaelis-Menten kinetics — their velocity-substrate curve is sigmoidal, not hyperbolic — and they are multi-subunit enzymes, not single-subunit ones. Each subunit of an allosteric enzyme carries both a catalytic (active) site and a separate regulatory (allosteric) site where effectors bind. Hence option D is correct.