Biology Enzymes MDCAT 2017
PMDC Verified Question 72 of 79
The reactants on which enzyme work are:
A
Metabolites
B
Catabolites
C
Substrates
D
Products
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: Substrates
Concept:

In enzymatic reactions, the initial molecules that undergo transformation are specifically termed in biochemistry to distinguish them from generic chemical reactants.

Solution:

  • A molecule that is directly acted upon by an enzyme is defined as a substrate.
  • When substrates bind to enzymes, they undergo an enzyme-induced chemical change and are converted into the final products.


Why other options are incorrect:

Products are the result of the reaction, not the starting material. Metabolites and catabolites are general terms for molecules involved in or resulting from metabolic processes, but 'substrate' is the precise term for the reactant of an enzyme.

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