A plant is treated with a chemical that blocks the flow of electrons between photosystem II and photosystem I,such that protons are not transported from the stroma into the thylakoid compartment.What is the effect of this chemical on photosynthesis?
A)the increased number of protons will be directly used in the thylakoid to produce glucose
B)an increased proton gradient will provide the energy needed to produce ATP from the light reactions
C)a decreased proton gradient will cause less ATP to be produced from the light reactions
D)the increased proton gradient will be used to make NADPH for the Calvin cycle

Question

Quizplus · Accepted Answer

Without the transport of protons from the stroma into the thylakoid compartment, there will be a decreased proton gradient across the thylakoid membrane. This gradient is necessary for the synthesis of ATP from the light reactions, so a decreased gradient will result in less ATP being produced.

A Plant Is Treated with a Chemical That Blocks the Flow