Subtopic: Fundamentals of Microbial growth kinetics
Question Statement:
Match the microbial growth characteristics in Group I with the corresponding features in
Group II.
Group I
Group I
P. Growth associated product formation
1. Specific growth rate decreases with
increasing product concentration
Q. Non growth associated product
formation
2. Specific product formation rate is
constant
R. Product inhibition
3. Specific product formation rate is
proportional to specific growth rate
S. Substrate inhibition
4. Specific growth rate decreases with
increasing substrate concentration
Options:
(A) P-1, Q-2, R-4, S-3
(B) P-3, Q-2, R-1, S-4
(C) P-2, Q-1, R-3, S-4
(D) P-2, Q-3, R-4, S-1
Official Answer Key:
B
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE BT 2011 Q.27)**
**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: *"Match the microbial growth characteristics in Group I with the corresponding features in
Group II.
Group I
Group I
P. Growth associated product formation
1. Specific growth rate decreases with
increasing product concentr..."*
- **Option (B) [CORRECT]**: *"P-3, Q-2, R-1, S-4"*
- Validated by canonical biochemistry/biotechnology literature. Specifically matches the molecular mechanism, kinetic model, or empirical finding required.
- **Option (A) [INCORRECT]**: *"P-1, Q-2, R-4, S-3"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (C) [INCORRECT]**: *"P-2, Q-1, R-3, S-4"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (D) [INCORRECT]**: *"P-2, Q-3, R-4, S-1"* does not satisfy the precise boundary conditions or molecular specificity.
**3. Final Answer / Verification Summary**:
- **Official GATE Answer Key**: **B**
- **Scoring Criteria**: 2 Marks (Negative marking: -0.66 marks).
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