The energetic equivalent of ________ ATP molecule(s) is/are consumed in transporting CO₂ to the chloroplasts of the bundle-sheath cells? A) 1 B) 2 C) 3 D) 4 E) 6

Question

Quizplus · Accepted Answer

The active transport of CO2 from mesophyll cells to bundle-sheath cells requires the expenditure of one ATP molecule per CO2 molecule transported. The C4 pathway also requires the expenditure of two extra ATP molecules to convert three-carbon acid molecules to four-carbon acid molecules. However, the question specifically asks about the transportation of CO2 to the bundle-sheath cells, not the complete C4 cycle, so the answer is one ATP molecule per CO2 molecule. Therefore, the best choice is B, 2 ATP molecules for transporting two CO2 molecules.

The Energetic Equivalent of ________ ATP Molecule(s) Is/are Consumed in Transporting