The proteins of the electron transport chain active in the light-dependent reactions
A)are membrane proteins present in the thylakoid.
B)are free proteins present in the thylakoid lumen.
C)are part of the reaction center of photosystem I.
D)have hydrophilic exterior surfaces.

Question

Quizplus · Accepted Answer

The electron transport chain proteins involved in the light-dependent reactions of photosynthesis are membrane proteins located in the thylakoid membrane. They are embedded within the membrane and therefore cannot be free proteins in the thylakoid lumen. Additionally, they are not part of the reaction center of photosystem I or II and have hydrophilic and hydrophobic regions, with the hydrophilic regions facing either the stroma or the thylakoid lumen.

The Proteins of the Electron Transport Chain Active in the Light-Dependent