Section 4: Bioprocess Engineering and Process Biotechnology
Mass transfer in bioprocesses (kLa)
Subtopic: Fundamentals of Mass transfer in bioprocesses (kLa)
Question Statement:
'Hairy roots' induced in vitro by the infection of Agrobacterium rhizogenes, are characterized by:
P. a high degree of lateral branching
Q. genetic instability of culture
R. an absence of geotropism
S. poor biomass production
Options:
(A) P and R only
(B) P and Q only
(C) Q and R only
(D) R and S only
Official Answer Key:
A
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE BT 2011 Q.11)**
**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: *"'Hairy roots' induced in vitro by the infection of Agrobacterium rhizogenes, are characterized by:
P. a high degree of lateral branching
Q. genetic instability of culture
R. an absence of geotropism
S. poor biomass produ..."*
- **Option (A) [CORRECT]**: *"P and R only"*
- Validated by canonical biochemistry/biotechnology literature. Specifically matches the molecular mechanism, kinetic model, or empirical finding required.
- **Option (B) [INCORRECT]**: *"P and Q only"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (C) [INCORRECT]**: *"Q and R only"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (D) [INCORRECT]**: *"R and S only"* does not satisfy the precise boundary conditions or molecular specificity.
**3. Final Answer / Verification Summary**:
- **Official GATE Answer Key**: **A**
- **Scoring Criteria**: 1 Mark (Negative marking: -0.33 marks).
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