Subtopic: Fundamentals of Cell structure and signaling
Question Statement:
The number of moleculespresent in this solution is
(A) 40.15x10
19 (B) 6.023 x1019 (C)4.015 x1019 (D) 0.08 x1019
2013 BIOTECHNOLOGY - BT
Common Data for Questions 50 and 51:
The binding efficiency of three different receptorsR1 , R2 and R3 were tested against a ligand using
equilibrium dialysis, with a constant concentration of receptor and varying concen trations of ligand. The
Scatchard plot of receptor titration with different concentration of ligand is given below
(ris moles of bound ligand per moles of receptor and c is concentration of free ligand)
12
4
3
2
1
r/c
R1
R2
R3
r
R4
30
Options:
(A) 40.15x10
19
(B) 6.023 x1019
(C) 4.015 x1019
(D) Q.08 x1019
2013 BIOTECHNOLOGY - BT
Common Data for Questions 50 and 51:
The binding efficiency of three different receptorsR1 , R2 and R3 were tested against a ligand using
equilibrium dialysis, with a constant concentration of receptor and varying concen trations of ligand. The
Scatchard plot of receptor titration with different concentration of ligand is given below
(ris moles of bound ligand per moles of receptor and c is concentration of free ligand)
12
4
3
2
1
r/c
R1
R2
R3
r
R4
30
Official Answer Key:
MTA
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE BT 2013 Q.49)**
**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: *"The number of moleculespresent in this solution is..."*
- **Option (MTA) [CORRECT]**: *""*
- Validated by canonical biochemistry/biotechnology literature. Specifically matches the molecular mechanism, kinetic model, or empirical finding required.
- **Option (A) [INCORRECT]**: *"40.15x10
19"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (B) [INCORRECT]**: *"6.023 x1019"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (C) [INCORRECT]**: *"4.015 x1019"* does not satisfy the precise boundary conditions or molecular specificity.
- **Option (D) [INCORRECT]**: *"0.08 x1019
2013 BIOTECHNOLOGY - BT
BT 11/13
Common Data for Questions "* does not satisfy the precise boundary conditions or molecular specificity.
**3. Final Answer / Verification Summary**:
- **Official GATE Answer Key**: **MTA**
- **Scoring Criteria**: 2 Marks (Negative marking: -0.66 marks).
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