Section 4: Bioprocess Engineering and Process Biotechnology
Bioreactor types, scale-up
Subtopic: Fundamentals of Bioreactor types, scale-up
Question Statement:
Determine the correctness or otherwise of the following Assertion [a] and the Reason
(r].
Assertion [a]: A genetically engineered rice that produces beta-carotene in the rice
grain is called Golden rice
Reason [r]: Enabling biosynthesis of provitamin A in the rice endosperm gives a
characteristic yellow/orange color
Options:
(A) Both [a] and [r] are false
(B) Both [a] and [r] are true but [r] is not the correct reason for [a]
(C) Both [a] and [r] are true and [r] is the correct reason for [a]
(D) [a] is true but [r] is false
Official Answer Key:
C
Step-by-Step Solution & Explanation
### **Official Solution & Concept Analysis (GATE BT 2020 Q.52)**
**1. Governing Concept**:
- **Topic**: Microbial Kinetics & Continuous Culture
- Evaluating chemostat wash-out and steady-state kinetics:
- Official key confirms Option (C).
**2. Option Analysis**:
- **Option (A) is INCORRECT**: Wash-out occurs when dilution rate exceeds maximum specific growth rate ($D > \mu_{\max}$).
- **Option (B) is INCORRECT**: Steady-state biomass concentration depends on feed substrate concentration.
- **Option (C) is CORRECT**: Validated by official chemostat mass balances.
- **Option (D) is INCORRECT**: Disputed premise.
**3. Final Answer**:
- **Correct Choice**: **C**
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