1. What is the role of the Fe-S cluster in Photosystem II?

a) It accepts only electrons from the preceding PSII component
b) It accepts electrons and protons from the preceding PSII component
c) It is responsible for establishing a pH gradient between the matrix and inner mitochondrial space
d) both a and b
e) both a and c

2. In photosynthesis,

a) The dark reactions take place in the outer mitochondrial membrane, whereas the light reactions occur in the inner mitochondrial membrane
b) The light reactions take place in the inner mitochondrial membrane, whereas the dark reactions occur in the matrix
c) The light reactions take place in the thylakoid membrane, whereas the dark reactions occur in the stroma
d) A pH gradient is established between the thylakoid space (high pH) and the stroma (low pH).
e) Both C and D