Chapter 6, Problem 15A

Summary Introduction

To match:

The terms on the left with the correct definition on the right.

Introduction:

Enzyme is a protein that speeds up a chemical reaction. The substrate is a molecule on which an enzyme acts. Enzymes catalyze chemical reactions where substrates are involved. Enzymes are catalysts. The lower the activation energy for a reaction, the rate will be faster. Thus enzymes increase the rate of reactions by lowering activation energy.

Explanation of Solution

The table below represents the correct match on left with right.

Substrate	A. a protein that speeds up a reaction.
	B. a substance formed by a chemical reaction.
	C. the energy required to start a reaction.
	D. a substance that binds to an enzyme.

The substrate is the substance on which an enzyme acts. In the case of a single substrate, the substrate binds on the enzyme active site, and an enzyme-substrate complex is formed. Hence, it can be correctly matched with D.