Photosynthesis Photosynthesis Electron Transport Chain

Question 1

Which photosystem in the thylakoid membrane is responsible for splitting water molecules to release oxygen?

Accepted Answer

Photosystem II (PSII)

Answer

Photosystem I (PSI)

Answer

ATP synthase

Answer

The cytochrome b6f complex

Question 2

What molecule accepts electrons from the iron-sulfur centers of Photosystem I during the light reactions?

Accepted Answer

Ferredoxin

Answer

Plastocyanin

Answer

Plastoquinone

Answer

NADP+ reductase

Question 3

Which manganese-containing protein complex carries out the oxidation of water in Photosystem II?

Accepted Answer

Oxygen-evolving complex (OEC)

Answer

Cytochrome b6f complex

Answer

ATP synthase (CF0-CF1)

Answer

Ferredoxin-NADP+ reductase

Question 4

What is the primary role of plastoquinone (PQ) in the photosynthetic electron transport chain?

Accepted Answer

Shuttle electrons and protons from PSII to the cytochrome b6f complex

Answer

Split water molecules to release O2

Answer

Reduce NADP+ to NADPH

Answer

Synthesize ATP using a proton gradient

Question 5

Which metal ion is absolutely required for the function of the oxygen-evolving complex in Photosystem II?

Accepted Answer

Manganese (Mn)

Answer

Iron (Fe)

Answer

Copper (Cu)

Answer

Zinc (Zn)

Question 6

In noncyclic photophosphorylation, what is the ultimate electron acceptor at the end of the linear electron transport chain?

Accepted Answer

NADP+

Answer

Oxygen (O2)

Answer

Ferredoxin

Answer

Plastocyanin