Chpt 19/20 quiz

Question 1

Plastoquinone (Q)

Answer 1

small lipid soluble protein that binds to plastoquinone

-cycles from plastoquinone (Q) to plastoquinol (QH2) as it passes 2 electrons/protons from PSII to cyt bf

Question 2

cytochrome bf

-structure

Answer 2

Transmembrane complex of thylakoid membrane
Four subunits
-cytochrome with 2 b-type hemes
-Rieske type Fe-S protein
-Cytochrome F with a c-type cytochrome

Homologues to Complex III-it uses the Q cycle

Question 3

cytochrome bf

-function

Answer 3

uses energy harvested from electrons to transfer protons into the thylakoid lumen