Question

Which one of the following statement is incorrect regarding the enzyme for carboxylation reaction of calvin cycle? *

1 point

a. It is most abundant protein on earth

b. It constitutes 50% of chloroplast protein

c. Subtrates of this enzyme are carbon dioxide and RuBP

d. It shows bifunctional nature and has both carboxylase and oxygenase activities

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Answer 1

Answer:

c. is your answer...........

Answer 2

Answer:

The incorrect statement regarding the enzyme for carboxylation reaction of Calvin cycle is b. It constitutes 50% of chloroplast protein.                

Explanation:

• The key enzyme essential for the carboxylation reaction of the Calvin cycle is RUBISCO (RuBP carboxylase).

• It is a large protein molecule of 8 large subunits (LSU), 8 small subunits (SSU) (L₈S₈) catalytic subunit is present in large units.
• It is the most abundant protein on earth as it is available in every plant and its crucial function contributes to global carbon fixation. Thus statement a. is correct.

• Ribulose-1,5-bisphosphate carboxylase/oxygenase is an enzyme which is involved in the first step of carbon fixation in the dark reaction. It is bifunctional as it has both carboxylase and oxygenase activities depending on the concentration of CO₂ & O₂ respectively. Hence this statement is correct.

• It helps to combine carbon dioxide with ribulose-1,5 biphosphate. Hence the substrates that are CO₂ and RuBP (ribulose 1,5 diphosphate) of this enzyme are carbon dioxide and RuBP. This statement is correct.

• Rubisco enzyme is located in the chloroplasts' stroma, consisting of 16% of chloroplast protein of the total protein. Hence this is an incorrect statement.

• The high concentration of RuBisCO indicates a significant role in the plant's metabolism as it is the major acceptor of carbon dioxide in C₃ plants and require in C₄ plants for carrying out the Calvin cycle.

Hence statement b. It constitutes 50% of chloroplast protein is incorrect.

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