GATE BT 2010 • Q25
MCQ • 1 Mark
Section 2: General Biotechnology
Biomolecules, enzyme kinetics
Subtopic: Fundamentals of Biomolecules, enzyme kinetics
Question Statement:
The formation of peptide cross-links between adjacent peptidoglycan chains in bacterial cell wall synthesis is catalyzed by
Options:
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(A) Autoglycosylation
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(B) Transpeptidation
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(C) Transglycosylation
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(D) Autopeptidation
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE BT 2010 Q.25)**
**1. Governing Concept & Syllabus Classification**:
- **Section**: Biotechnology
- **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 formation of peptide cross-links bervicen adjacent glycan chains in cell wall synthesis is called..."*
- **Option (D) [CORRECT]**: *"Transpeptidation
Q.26 - Q.55 carry two marks each."*
- Validated by canonical biochemistry/biotechnology literature. Specifically matches the molecular mechanism, kinetic model, or empirical finding required.
- **Option (C) [INCORRECT]**: *"Transglycosylation"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (B) [INCORRECT]**: *"Autoglycosylation
Auropepridation"* does not satisfy the precise boundary conditions or molecular specificity.
**3. Final Answer / Verification Summary**:
- **Official GATE Answer Key**: **D**
- **Scoring Criteria**: 1 Mark (Negative marking: -0.33 marks).
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