Question

........... are the most abundant proteins in the living world.

• A. Ribozyme of plants and collagen of animals
• B. RuBisCO of plants and collagen of animals
• C. PEPcase of plants and keratin of animals
• D. Alcohol dehydrogenase of plants and melanin of animals

Answer 1

The correct option is B RuBisCO of plants and collagen of animals

• The most abundant protein in the world is RuBisCO. This is an enzyme that catalyzes the first step in carbon fixation.
• RuBisCO is found in plants, algae, cyanobacteria, and certain other bacteria.
• Carbon fixation is the main chemical reaction responsible for inorganic carbon used for the formation of food.
• The most abundant protein in the human body is collagen.
• It is the common protein in other mammals. Collagen forms connective tissue.
• It is found primarily in fibrous tissue, such as tendons, ligaments, and skin.
• It is a component of muscle, cartilage, bone, blood vessels, the cornea of the eye, intervertebral discs and the intestinal tract.

Thus, the correct answer is option B.