Which of the following compounds corresponds to the statement "a substance that increases the speed of a reaction and is found unchanged at the end of it"?
A) Catalyst
B) Modulator
C) Cholesterol
D) Cofactor
E) Effector
IMAT 2025 · Question 19
Q19 - The role of enzymes
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The correct answer is A) Catalyst.
Speeds up the reaction and comes out unchanged: a catalyst. Enzymes are biological catalysts.
A cofactor helps an enzyme work but isn't the catalyst itself. Modulators and effectors change how active an enzyme is, which can mean slowing it down as well as speeding it up.
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