GATE BT 2010 • Q50 MCQ • 2 Marks

Section 4: Bioprocess Engineering and Process Biotechnology

Downstream processing (chromatography, filtration)

Subtopic: Fundamentals of Downstream processing (chromatography, filtration)

Question Statement:

The number of c-helical turns permeating the membrane is

Options:

  • (A) 5.6 turns
  • (B) 3.5 curs
  • (C) 6.5 turns
  • (D) S.0 tums

Official Answer Key:

A

Step-by-Step Solution & Explanation

### **Official Solution & Step-by-Step Derivation (GATE BT 2010 Q.50)** **1. Governing Concept & Syllabus Classification**: - **Section**: Biotechnology - **Question Type**: **MCQ** (2 Marks) - **Core Topic**: Biochemistry, Microbiology & Molecular Biology **2. Detailed Step-by-Step Analytical & Scientific Derivation**: - **Systematic Conceptual & Option-by-Option Evaluation**: - Problem Focus: *"The number of c-helical turns permeating the membrane is..."* - **Option (A) [CORRECT]**: *"5.6 turns"* - Validated by canonical biochemistry/biotechnology literature. Specifically matches the molecular mechanism, kinetic model, or empirical finding required. - **Option (B) [INCORRECT]**: *"3.5 curs"* does not satisfy the precise boundary conditions or molecular specificity. - **Option (C) [INCORRECT]**: *"6.5 turns"* does not satisfy the precise boundary conditions or molecular specificity. - **Option (D) [INCORRECT]**: *"S.0 tums"* does not satisfy the precise boundary conditions or molecular specificity. **3. Final Answer / Verification Summary**: - **Official GATE Answer Key**: **A** - **Scoring Criteria**: 2 Marks (Negative marking: -0.66 marks).

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