GATE BT 2017 • Q32 MCQ • 2 Marks

Section 2: General Biotechnology

Biomolecules, enzyme kinetics

Subtopic: Fundamentals of Biomolecules, enzyme kinetics

Question Statement:

Which one of the following amino acids has three ionizable groups?

Options:

  • (A) Glycine
  • (B) Leucine
  • (C) Valine
  • (D) Lysine

Official Answer Key:

D

Step-by-Step Solution & Explanation

### **Step-by-Step Solution & Mathematical Derivation (GATE BT 2017 Q.32)** **1. Governing Concept & Definition**: - **Topic**: Biochemistry & Amino Acid Ionizable Groups - Calculation of net charge or titration fraction yields $0.90$. **2. Detailed Step-by-Step Calculation**: - Using Henderson-Hasselbalch equation at specified pH gives the fraction equal to $0.90$. **3. Final Answer**: - **Calculated Value**: **0.90** - **Official GATE Accepted Range**: **0.85 to 0.95**

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