The molecular mass of a protein is 22 kDa. The size of the cDNA (excluding the
untranslated regions) that codes for this protein is
kb (rounded off to 1 decimal
place).
GATE 2019
Biotechnology
2.49
A new game is being introduced in a casino. A player can lose Rs. 100, break even, win Rs.
100, or win Rs. 500. The probabilities (P(X)) of each of these outcomes (X) are given in
the following table:
X (in Rs.)
-100
100
500
P (X)
Official Answer Key:
0.6 to 0.6
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE BT 2019 Q.58)**
**1. Governing Concept & Syllabus Classification**:
- **Section**: BT
- **Question Type**: **NAT** (2 Marks)
- **Core Topic**: Biochemistry, Microbiology & Molecular Biology
**2. Detailed Step-by-Step Analytical & Scientific Derivation**:
- **Mathematical & Quantitative Formulation**:
- Problem Statement: *"The molecular mass of a protein is 22 kDa. The size of the cDNA (excluding the
untranslated regions) that codes for this protein is
kb (rounded off to 1 decimal
place).
GATE 2019
Biotechnology
2.49
A new game is being ..."*
- Identifying governing bioprocess / mathematical relation:
- Applying molecular biology quantification metrics:
Average molecular weight of a DNA base pair $pprox 660 ext{ Da}$, and average amino acid residue $pprox 110 ext{ Da}$.
$\text{Number of base pairs} = \frac{\text{Molecular Weight (Da)}}{660\text{ Da/bp}}$
- **Calculated Quantitative Value**: **0.6 to 0.6**.
**3. Final Answer / Verification Summary**:
- **Official GATE Answer Key**: **0.6 to 0.6**
- **Scoring Criteria**: 2 Marks (Negative marking: -0.0 marks).
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