Asked in Premeth Test 3 — The Cell, Evolution and Enzymes (5 March 2025) 2025Moderate

Regulatory sites other than the active site, present over the enzymes, are called:

Correct answer: D. Allosteric sites

  • A. Active sites
  • B. Binding site
  • C. Catalytic groups
  • D. Allosteric sites

Explanation

The correct answer is Allosteric sites. These are sites on an enzyme other than the active site where molecules can bind to regulate the enzyme's activity. Binding at an allosteric site can lead to a change in enzyme shape and function, either enhancing or inhibiting its activity. In contrast, the active site is where the substrate binds and the reaction occurs, while catalytic groups are specific residues in the active site responsible for the catalysis. Binding sites generally refer to any site where molecules can attach, but do not necessarily regulate enzyme activity.

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