GATE BT 2010 • Q39 MCQ • 2 Marks

Section 2: General Biotechnology

Cell structure and signaling

Subtopic: Fundamentals of Cell structure and signaling

Question Statement:

Dizygotic twins are connected to a single placenta during iheir embryonic development. These wins

Options:

  • (A) and
  • (B) ) can accept grafts from each other
  • (C) have identical T cells
  • (D) (both

Official Answer Key:

A

Step-by-Step Solution & Explanation

### **Official Solution & Step-by-Step Derivation (GATE BT 2010 Q.39)** **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: *"Dizygotic twins are connected to a single placenta during iheir embryonic development. These wins..."* - **Option (A) [CORRECT]**: *"and"* - Validated by canonical biochemistry/biotechnology literature. Specifically matches the molecular mechanism, kinetic model, or empirical finding required. - **Option (B) [INCORRECT]**: *") can accept grafts from each other"* does not satisfy the precise boundary conditions or molecular specificity. - **Option (C) [INCORRECT]**: *"have identical T cells"* does not satisfy the precise boundary conditions or molecular specificity. - **Option (D) [INCORRECT]**: *"(both"* does not satisfy the precise boundary conditions or molecular specificity. **3. Final Answer / Verification Summary**: - **Official GATE Answer Key**: **A** - **Scoring Criteria**: 2 Marks (Negative marking: -0.66 marks).

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