Plastoquinone (PQ), an Electron Carrier of Small Molecular Weight, Is

Multiple Choice

Plastoquinone (PQ) , an electron carrier of small molecular weight, is found in the electron transport chain associated with photosystem II. If PQ is not directly anchored to other membrane or cytoplasmic structures, it is probably ________.

A) mobile in the thylakoid membrane
B) lipid soluble
C) a molecule that serves as a shuttle between the electron transport chain and ATP synthase
D) both lipid soluble and a molecule that serves as a shuttle between the electron transport chain and ATP synthase