Question

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

	X	Y
A	Activation energy without enzyme	Activation energy with enzyme
B	Activation energy with enzyme	Activation energy without enzyme
C	Substrate concentration with enzyme	Substrate concentration without enzyme
D	Substrate concentration without enzym	Substrate concentration with enzyme

• A. A
• B. B
• C. C
• D. D

Answer 1

The correct option is B B

Enzymes are proteins which act as biocatalysts and help in speeding up metabolic reactions by lowering the activation energy of a reaction. As shown in the graph above, enzymes only lower activation energy, but do not change the difference in energy levels between reactants and products. They convert a non-spontaneous reaction into a spontaneous reaction.