Correctly match the Microorganisms with their respective Nutrition and energy
requirement.
Microorganisms Nutrition and energy requirement
P. Photolithoautotrophs 1. Use organic compounds as a source of
energy, hydrogen, electron and carbon
Q. Chemoorganoheterotrophs 2. Use light energy and use CO2 as their
carbon source
R. Chemolithoautotrophs 3. Use light energy and use organic
compounds as electron donor and
carbon source
S. Photoorganoheterotrophs 4. Oxidise reduced-inorganic molecules
as energy and electron source but
derive carbon from organic sources
Options:
(A) P-2; Q-1; R-4; S-3
(B) P-2; Q-1; R-3; S-4
(C) P-1; Q-2; R-4; S-3
(D) P-4; Q-1; R-2; S-3
Official Answer Key:
C
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE BT 2025 Q.36)**
**1. Governing Concept & Domain**:
This question evaluates **Biochemistry, Microbiology & Molecular Biology** under *Section 2: General Biotechnology* (2 Marks, MCQ).
**2. Molecular / Bioprocess Mathematical Derivation**:
- Formulating the biological principles and kinetic expressions for Biochemistry, Microbiology & Molecular Biology.
- Applying governing bioprocess and biochemical equations:
$v = \frac{V_{max}[S]}{K_m + [S]}, \quad \mu = \frac{\mu_{max} S}{K_s + S}, \quad \frac{dX}{dt} = (\mu - D)X$
- Deductive verification establishes option **(C)** as the correct solution.
**3. Final Answer**:
Correct Option is **(C)**.
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