NEET Biology: Enzymes questions with solutions

Q1. 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.

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

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.