Problem 120 - Objective Biology for NEET

Question

Enzymes which catalyse hydrolysis of ester, ether, peptide, glycosidic bond belongs to the class (a) Oxidoreductase (b) Transferase (c) Hydrolase (d) Ligase

Step-by-Step Solution

Answer

The class of enzymes which catalyse hydrolysis of ester, ether, peptide, glycosidic bonds is Hydrolases.

Step 1: Understand the Types of Enzymes

Enzymes are organized into six primary classes and perform different functions. These include: 1. Oxidoreductases: Enzymes that carry out oxidation or reduction reactions. 2. Transferases: Enzymes that transfer functional groups from one molecule to another. 3. Hydrolases: Enzymes that catalyze hydrolysis reactions - a reaction where a molecule is split into two by addition of a water molecule. 4. Lyases: Enzymes are that catalyze the removal of groups from a molecule, often forming double bonds. 5. Isomerases: Enzymes catalyzing the transfer of groups within molecules to yield isomeric forms. 6. Ligases or Synthetases: Enzymes that catalyze the joining of two molecules using ATP.

Step 2: Identify the Correct Enzyme Class

The question asks for the enzyme that catalyzes the hydrolysis of ester, ether, peptide, and glycosidic bonds. Based on Step 1, this type of reaction (hydrolysis) is carried out by hydrolases, thus the correct answer should be Hydrolases.

Key Concepts

Hydrolase

Hydrolases are one of the primary classes of enzymes, crucial to biochemical processes. These enzymes are involved in hydrolysis reactions, which means they catalyze the breaking down of complex molecules into simpler ones by adding a water molecule. This process is essential in digestion and metabolism.
For example, hydrolases help break down proteins into amino acids by cleaving peptide bonds. They also decompose starches and carbohydrates by severing glycosidic bonds, releasing sugars that the body can absorb. Additionally, hydrolases play a significant role in breaking down fats and nucleic acids.

• Pepsin and trypsin, enzymes found in the stomach, are examples of protein-hydrolyzing enzymes.
• Amylase is another well-known hydrolase that helps digest carbohydrates.

Understanding hydrolases offers insight into how our bodies utilize nutrients from the foods we consume.

Oxidoreductase

Oxidoreductases are enzymes that facilitate oxidation-reduction reactions, where the transfer of electrons occurs between two substances. These reactions are vital for energy production in living organisms.
Oxidoreductases work by either adding oxygen or removing hydrogen from a substrate, contributing to vital processes like cellular respiration—a series of metabolic reactions to produce ATP, the energy currency of cells.

• Catalase is an oxidoreductase that helps convert hydrogen peroxide, a harmful byproduct of metabolism, into water and oxygen, thus protecting cells.
• Cytochrome c oxidase, another example, plays a critical role in the electron transport chain, which is part of cellular respiration.

By understanding oxidoreductases, students can appreciate their importance not just in energy production, but also in maintaining cellular health.

Transferase

Transferases are a diverse group of enzymes responsible for transferring functional groups, such as methyl, phosphate, or amino groups, from one molecule to another. This class of enzymes is essential in various metabolic pathways, contributing to both the synthesis and breakdown of vital biomolecules.
In many biochemical reactions, transferases activate molecules by transferring specific groups, enabling them to undergo different chemical reactions.

• Kinases are a type of transferase that transfer phosphate groups, a key step in metabolism and signal transduction.
• Transaminases, another group, are involved in amino acid metabolism by transferring amino groups.

Understanding transferases helps explain how cells regulate various biochemical processes, including growth, energy production, and response to environmental changes.