Question

Which of the following statement(s) is/are correct about $RuBisCO$ ?

• A. It catalyzes the fixation of $C{O}_2$.
• B. It has both oxygenation & carboxylation activities.
• C. It is the most abundant protein on earth.
• D. All of the above

Answer 1

Answer: (D)

Rubisco is an enzyme present in chloroplasts, involved in fixing atmospheric carbon dioxide during photosynthesis and in oxygenation of the resulting compound during photorespiration. It is the most abundant enzyme on the earth and catalyzes the carboxylation of $C{O}_2$ to ribulose 1, 5-bisphosphate, initiates photorespiration when the $C{O}_2/O_2$ ratio is low.