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The presence of enzyme (catalyst) increases the speed of reaction by lowering the energy barrier, i.e., a new path is followed with lower activation energy.

1. Catalyst increases activation energy.
2. Catalyst decreases activation energy.
3. Catalyst does not affect activation energy.
4. Catalyst increases the energy barrier.

Correct answer: Catalyst decreases activation energy.

Solution

A catalyst works by providing an alternative reaction pathway with lower activation energy, thereby increasing the reaction rate.

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