Match the immunoglobulin class in Group I with its properties in Group II
Group I Group II
P. IgG 1. Major antibody in external secretions such as bronchial mucus
Q. IgA 2. Protects against parasites
R. IgE 3. Antibody that appears first in serum after exposure to an antigen
S. IgM 4. Antibody present in highest concentration in serum
Options:
(A) experienced
(B) has experienced
(C) is experiencing
(D) experiences
Official Answer Key:
B
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE BT 2014 Q.56)**
**1. Governing Concept & Syllabus Classification**:
- **Section**: BT
- **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 immunoglobulin class in Group I with its properties in Group II
Group I Group II
P. IgG 1. M..."*
- **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-4, Q-1, R-2, S-3"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (C) [INCORRECT]**: *"P-4, Q-3, R-1, S-2"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (D) [INCORRECT]**: *"P-1, Q-4, R-3, S-2
BT
7/9
BT (GATE 2014)
GATE 2014 "* 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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