Question:
Which is the most abundant protein in the entire biosphere?
Which is the most abundant protein in the entire biosphere?
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• RuBisCO → Carbon fixation enzyme
• Most abundant protein on Earth
Updated On: May 13, 2026
- Collagen
- Haemoglobin
- Proteases
- Ribulose bisphosphate Carboxylase-Oxygenase
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The Correct Option is D
Solution and Explanation
Concept:
Ribulose-1,5-bisphosphate carboxylase-oxygenase (RuBisCO) is the enzyme responsible for carbon fixation in photosynthesis.
• Present in all photosynthetic organisms (plants, algae, cyanobacteria)
• Extremely abundant due to its central role in the Calvin cycle
Step 1: Analyzing each option.
• Collagen: Most abundant protein in animals, not entire biosphere.
• Haemoglobin: Abundant in blood, but limited to animals.
• Proteases: Group of enzymes, not a single most abundant protein.
• RuBisCO: Present globally in photosynthetic organisms → Most abundant protein.
Step 2: Selecting the correct answer.
Thus, RuBisCO is the most abundant protein in the biosphere.
• Present in all photosynthetic organisms (plants, algae, cyanobacteria)
• Extremely abundant due to its central role in the Calvin cycle
Step 1: Analyzing each option.
• Collagen: Most abundant protein in animals, not entire biosphere.
• Haemoglobin: Abundant in blood, but limited to animals.
• Proteases: Group of enzymes, not a single most abundant protein.
• RuBisCO: Present globally in photosynthetic organisms → Most abundant protein.
Step 2: Selecting the correct answer.
Thus, RuBisCO is the most abundant protein in the biosphere.
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