The stroma of the chloroplasts contains the remaining 120A° portion. The stroma has a significant amount of ATP synthase protein.
Because of a proton gradient created by light reactions, plants produce the ATP synthase Enzyme, a protein for the synthesis of ATP from ADP and inorganic phosphate.
Typically, chloroplasts' thylakoid membrane contains the ATP synthase protein. It starts at the thylakoid lumen and travels through the thylakoid membrane to reach the stroma of the chloroplasts. However, we need a lot of ATP synthase. The thylakoid membrane measures 40A° in thickness. Fo and F1 are connected by a 37A° stalk. In chloroplasts, the Fo portion of ATP synthase has a diameter of 62A° and a height of 83A°. The F1 component has a diameter of 115 A° and a height of 85 A°. Thus, the whole size can reach 200A°. Only 10% of the Fo molecule is found in the lumen of chloroplasts' thylakoid membrane. It indicates that the thylakoid membrane and lumen contain up to 80A° of ATP synthase. Option C is erroneous because the thylakoid membrane only contains 70–75A° of the Fo portion. Option A is wrong because intermembrane space, which is the area between the outer and inner membranes of chloroplasts, lacks ATP synthase.
Thus, we might infer that the remaining 120A° part is contained in the stroma of the chloroplasts. A considerable amount of ATP synthase protein is present in the stroma-B.
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