Most abundant protein:
Correct answer: D. Rubisco
- A. Keratin
- B. Albumin
- C. Dehydrogenases
- D. Rubisco
Explanation
Rubisco is the most abundant protein on Earth because it is essential for photosynthesis in plants, algae, and some bacteria. It catalyzes the fixation of carbon dioxide into organic compounds, a critical step in the Calvin cycle. In contrast, Keratin is abundant in external body structures but limited to animals; Albumin is limited to blood plasma; and Dehydrogenases, while important in cellular respiration, are restricted to mitochondrial processes and not as ubiquitously present as Rubisco.
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