Subtopic: Fundamentals of Microbial growth kinetics
Question Statement:
Substrate consumption in lag phase of microbial growth is primarily used for
P. turn over of the cell material
Q. maintenance of intracellular pH
R. motility
S. increase in cell number
Options:
(A) P, Q and S only
(B) Q, R and S only
(C) P, Q and R only
(D) S only
2011
BT
Official Answer Key:
C
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE BT 2011 Q.15)**
**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: *"Substrate consumption in lag phase of microbial growth is primarily used for
P. turn over of the cell material
Q. maintenance of intracellular pH
R. motility
S. increase in cell number..."*
- **Option (C) [CORRECT]**: *"P, Q and R only"*
- Validated by canonical biochemistry/biotechnology literature. Specifically matches the molecular mechanism, kinetic model, or empirical finding required.
- **Option (A) [INCORRECT]**: *"P, Q and S only"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (B) [INCORRECT]**: *"Q, R and S only"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (D) [INCORRECT]**: *"S only
BT
3/16
--- PAGE 4 ---
2011
BT"* 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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