How much of the protein content in chloroplasts is made up of the enzyme RuBP carboxylase? Why?
A) less than 1%; the enzyme is very fast
B) less than 1%; the enzyme also catalyzes several side reactions
C) 20-50%; the enzyme also catalyzes several side reactions
D) 20-50%; the enzyme is very slow
E) almost 100%; the enzyme is very slow

Question

Quizplus · Accepted Answer

RuBP carboxylase, also known as ribulose-1,5-bisphosphate carboxylase/oxygenase or RuBisCO, is the most abundant enzyme on Earth and makes up 20-50% of the protein content in chloroplasts. This high proportion is because the enzyme is very slow, necessitating a large amount of it to meet the photosynthetic demand of plants.

How Much of the Protein Content in Chloroplasts Is Made