Question

The most abundant protein found in biosphere is:

• A. Rubisco
• B. Peptase
• C. PEP carboxylase
• D. Kinase

Hint:

Rubisco:
- Most abundant protein on Earth.
- Catalyzes CO2 fixation in photosynthesis.
- Has both carboxylase and oxygenase activity.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This question tests knowledge of the most abundant protein on Earth.

Step 2: Detailed Explanation:
Rubisco (Ribulose-1,5-bisphosphate carboxylase/oxygenase) is the most abundant protein in the biosphere.
It catalyzes the first step of carbon fixation (Calvin cycle).
It constitutes about 25-40% of leaf protein.
Peptase (B): Not a standard term.
PEP carboxylase (C): Important in C4 plants, but not the most abundant.
Kinase (D): A class of enzymes, not a specific abundant protein.
Thus, Rubisco is the most abundant protein.

Step 3: Final Answer:
Thus, Rubisco is the most abundant protein in the biosphere, which corresponds to option (A).
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