key players

Question 1

P680

(oxidized or reduced)

Answer 1

• reduces to P680 with electrons and water-splitting complex to be oxidized again
  -oxidized when it transfers high-energy electrons

Question 2

P700

(oxidized or reduced)

Answer 2

• reduced via electrons from plastocyanin
• photon provides more energy
• oxidized and electron gets pulled to PEA in photosystem I

Question 3

NADP+

Answer 3

reduced; electron is transfered to NADP+ to form NADP

Question 4

NADPH

Answer 4

oxidized; a second electron and an H+ ion from the stroma are transferred to NADP forming NADPH

this is the final electron acceptor

Question 5

malate in C4

(oxidized or reduced)

Answer 5

oxidized to pyruvate; when it diffuses from the mesophyll cell into the bundle-sheath cells, and enters chloroplasts

Question 6

oxaloacetate

(oxidized or reduced)

Answer 6

reduced to malate

Question 7

malate in C3

(oxidized or reduced)

Answer 7

oxidized; when malic acid diffuses from the vacuoles into the cytosol