1
Role of enzyme in reactions is to/as
- decrease activation energy
- increase activation energy
- inorganic catalyst
- none of the above.
Answer
(1) decrease activation energy
Solution
As per NCERT, the substrate has to cross a higher energy level (transition state) to form the product; the energy needed is the activation energy.
⇒ An enzyme forms an enzyme–substrate complex that brings down this energy barrier, so the reaction is faster.
∵ Enzymes are proteins (organic biocatalysts), not inorganic catalysts.
∴ Enzymes decrease the activation energy.
Answer: (1)
AIPMT 2000