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What is denoted by \( X \) and \( Y \) in the given graph?

1. \( x \) -Activation energy without enzyme; Y-Activation energy with enzyme
2. X-Activation energy with enzyme; Y-Activation energy without enzyme.
3. \( x \) -substrate concentration with enzyme; \( Y \) - Substrate concentration without enzyme.
4. X-Substrate concentration without enzyme; YSubstrate concentration with enzyme.

Correct answer: \( x \) -Activation energy without enzyme; Y-Activation energy with enzyme

Solution

Activation energy is higher for the uncatalyzed reaction because no enzyme is present to lower the barrier. The enzyme-catalyzed pathway has a smaller activation energy, so the lower label corresponds to the reaction with enzyme.

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