Read the following statements about the processes in photosynthesis and select how many are correct:
a) Water molecule splitting on the inner side of the thylakoid membrane results in proton accumulation in the lumen.
b) Electrons move through photosystems without causing any transport of protons across the membrane.
c) NADP reductase, involved in forming NADPH, is located on the stroma side of the membrane and uses protons from the stroma.
d) The ATP synthase enzyme has a part called CF0 that helps in the facilitated diffusion of protons across the membrane.
e) ATP formation by ATP synthase does not require a proton gradient across the
membrane.

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Two statements are correct.

One statement is correct.

Three statements are correct.

Four statements are correct.

answer is C.

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Detailed Solution

b) As electrons move through the photosystem, protons are transported across the membrane. This happens because the primary accepter of an electron which is located towards the outer side of the membrane transfers its electron not to an electron carrier but to an H carrier.

e) The proton gradient is important because it is the breakdown of this gradient that leads to the synthesis of ATP. The gradient is broken down due to the movement of protons across the membrane to the stroma through the transmembrane.

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