The MOST abundant protein on Earth is thought to be:
A)chlorophyll.
B)cellulose.
C)rubisco.
D)water.
E)keratin.

Question

Quizplus · Accepted Answer

Rubisco is an enzyme found in plants and algae that is responsible for fixing carbon dioxide during photosynthesis. As photosynthesis is a crucial process for life on earth, it is estimated that rubisco is the most abundant protein on earth. While cellulose is also a common component of plant cell walls, it is not a protein. Chlorophyll is a pigment that plays a role in photosynthesis but is not a protein. Water is a molecule, not a protein, and keratin is a protein found mainly in vertebrate animals and is not as abundant as rubisco.

The MOST Abundant Protein on Earth Is Thought to Be