Question

The active site of an enzyme is

• A. Non-specific region
• B. Site of protein synthesis
• C. Site of degradation
• D. Site of substrate binding

Hint:

Remember: \[ \boxed{\text{Active Site}=\text{Substrate Binding + Catalysis}} \] The active site determines enzyme specificity and lowers the activation energy of the reaction.

Answer 1

The Correct Option is D

Concept: Enzymes are biological catalysts that speed up biochemical reactions without being consumed. Each enzyme contains a specific three-dimensional region called the active site. This region binds specifically to the substrate and catalyzes its conversion into products. The specificity of an enzyme is mainly due to the unique shape and chemical properties of its active site.

Step 1: Understand the active site.
The active site is a small pocket or groove on the enzyme surface. It performs two important functions:
• Specifically recognizes and binds the substrate.
• Catalyzes the chemical reaction by lowering the activation energy. \[ \boxed{\text{Enzyme} + \text{Substrate} \longrightarrow \text{Enzyme-Substrate Complex} \longrightarrow \text{Product}} \]

Step 2: Role of the active site.
The amino acid residues present at the active site interact with the substrate through weak interactions such as:
• Hydrogen bonds
• Ionic interactions
• Hydrophobic interactions
• Van der Waals forces These interactions ensure high substrate specificity.

Step 3: Eliminate the incorrect options.

• The active site is highly specific, not non-specific.
• Protein synthesis occurs on ribosomes.
• Enzyme degradation occurs through other cellular processes.
• The active site is the region where substrate binding and catalysis occur. Final Answer: \[ \boxed{Option (D) is correct \]