Ribulose bisphosphate carboxylase (rubisco) A) is the most abundant enzyme in the biosphere, comprising as much as 50% of plant cell protein. B) catalyzes the reaction of C₅ molecule and CO₂ with a C₆ sugar product. C) is located in the thylakoid lumen. D) requires NADPH and ATP to fix CO₂.

Question

Quizplus · Accepted Answer

Ribulose bisphosphate carboxylase, also known as rubisco, is a crucial enzyme in the process of photosynthesis and is responsible for fixing carbon dioxide from the atmosphere into organic molecules. It is the most abundant enzyme in the biosphere and is found in high concentrations in the chloroplasts of plant cells, where it comprises as much as 50% of the total protein. Thus, choice A is correct. Choices B, C, and D are incorrect as they contain incorrect statements about the enzyme and its function.

Ribulose Bisphosphate Carboxylase (Rubisco)