Which one of the following statements is not true about enzymes?
Biomolecules · Class 12 · JEE Main Previous Year Question
Which one of the following statements is not true about enzymes?
- a
The action of enzymes is temperature and pH specific.
- b✓
Enzymes are non-specific for a reaction and substrate.
- c
Enzymes work as catalysts by lowering the activation energy of a biochemical reaction.
- d
Almost all enzymes are proteins.
Enzymes are non-specific for a reaction and substrate.
Step 1: Enzyme Characteristics — Enzymes are biocatalysts that work by lowering activation energy. They are mostly proteins and are highly sensitive to pH and temperature.
Step 2: Identifying the False Claim — Statement (b) suggests enzymes are non-specific. In reality, enzymes are extremely specific, often only acting on a single enantiomer or a specific substrate bond.
Step 3: Conclusion — Thus, statement (b) is the only one that is not true. Correct option is (b).
Key Point: Enzyme specificity arises from the precise geometric and chemical complementarity of the active site.
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