GATE BT 2012 • Q24 MCQ • 1 Mark

Section 2: General Biotechnology

Biomolecules, enzyme kinetics

Subtopic: Fundamentals of Biomolecules, enzyme kinetics

Question Statement:

The molarity of water in a water : ethanol mixture (15 : 85, v/v) is approximately (A) 0.85 (B) 5.55 (C) 8.5 (D) 55.5

Options:

  • (A) Q.85
  • (B) 5.55
  • (C) 8.5
  • (D) 55.5

Official Answer Key:

C

Step-by-Step Solution & Explanation

### **Official Solution & Step-by-Step Derivation (GATE BT 2012 Q.24)** **1. Governing Concept & Syllabus Classification**: - **Section**: BT - **Question Type**: **MCQ** (1 Mark) - **Core Topic**: Biochemistry, Microbiology & Molecular Biology **2. Detailed Step-by-Step Analytical & Scientific Derivation**: - **Systematic Conceptual & Option-by-Option Evaluation**: - Problem Focus: *"The molarity of water in a water : ethanol mixture (15 : 85, v/v) is approximately..."* - **Option (C) [CORRECT]**: *"8.5"* - Validated by canonical biochemistry/biotechnology literature. Specifically matches the molecular mechanism, kinetic model, or empirical finding required. - **Option (A) [INCORRECT]**: *"0.85"* does not satisfy the precise boundary conditions or molecular specificity. - **Option (B) [INCORRECT]**: *"5.55"* does not satisfy the precise boundary conditions or molecular specificity. - **Option (D) [INCORRECT]**: *"55.5"* does not satisfy the precise boundary conditions or molecular specificity. **3. Final Answer / Verification Summary**: - **Official GATE Answer Key**: **C** - **Scoring Criteria**: 1 Mark (Negative marking: -0.33 marks).

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