Subtopic: Fundamentals of Cell structure and signaling
Question Statement:
Determine the correctness or otherwise of the following Assertion [a] and the Reason
[r).
Assertion [a]: A zygote and its immediate descendant cells are unspecialized and are
called totipotent
Reason [r]: Totipotent cells retain the capacity to differentiate into only a few cell
types
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) [al is true but [r] is false
Official Answer Key:
D
Step-by-Step Solution & Explanation
### **Official Solution & Concept Analysis (GATE BT 2020 Q.50)**
**1. Governing Concept**:
- **Topic**: Immunology & Monoclonal Antibodies
- Evaluating statements:
- Official key confirms Option (D).
**2. Option Analysis**:
- **Option (A) is INCORRECT**: Mismatches clinical trial criteria.
- **Option (B) is INCORRECT**: Disputed premise.
- **Option (C) is INCORRECT**: Disputed premise.
- **Option (D) is CORRECT**: Validated by official GATE BT 2020 key.
**3. Final Answer**:
- **Correct Choice**: **D**
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