Concept explainers
Interpretation:
The basis of most common nomenclature used for classification of enzymes has to be determined.
Concept Introduction:
The enzymes are essentially the biocatalysts present in all living systems. Each enzyme catalyzes a characteristic reaction within the biological system. Generally, most of the enzymes are proteins. Enzymes can make those reactions complete in an instant that otherwise takes days or weeks or extremely high temperature to complete.

Explanation of Solution
Enzymes are often named in accordance with the substrate on which they act. For example, lactase acts on the disaccharide named lactose and helps to remove the glycosidic linkages of lactose and therefore serves to hydrolyze the bond. Hence since the substrate is lactose the enzyme is coined the name lactase that is formed by addition of suffix–ase to the substrate.
Similarly, the enzyme sucrase derives its name from sucrose as it hydrolyzes the linkages of sucrose to yield fructose and glucose monomers of disaccharide sucrose.
Based on their specific role, they are classified into six major classes. These are as follows:
- Ligases: The enzymes that connect two molecules via covalent bonds are termed as ligases.
- Isomerases: The enzymes that catalyze the isomerization reactions are termed as isomerases.
- Lyases: Enzymes that catalyze the cleavage of bonds are called lyases.
- Hydrolases: These enzymes catalyze the cleavage of bonds via hydrolysis present in biological systems.
- Transferases: These enzymes that are involved in the transfer of various
functional groups such as methyl, acetyl group, or phosphate group. - Oxidoreductases: As the name suggests, these catalyze the
oxidation and reduction reactions that occur in living systems.
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Chapter 19 Solutions
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