Question

Below is a picture of the "Z-scheme" of photosynthesis. It is a free energy diagram for electrons in the light reactious. Rpfer to it when answering the following questions. STOOD CH TEL water CDC holeste A. (pt) What is the high energy electron donor for the ETC? B. (1 pt) What is the high energy electron donor for the pathway making NADPH? (1 pt) Remember, this is a free energy diagram. What happens to the free energy the electrons as they pass through the ETC? D. (1 pt) What is the role of light in the light reactions? E (1 pt) What is the final electron acceptor?

Answer 1

A) high energy electron doner in ETC is water molecules. Water molecules upon splitting released electrons which enter in to the ETC .

B) again water molecules are doner of high energy electron for pathway making NADPH.

C) as electrons pass through ETC , at some places they release small amount of energy while at some places enough amount of energy is released. This enough amount of energy is used to tranport protons H+ from inside of thylakoids lumens to stroma which generate proton gradient. Later this proton gradient is used to synthesize ATP

D) light is absorbed by chlorophyll pigment in plant, and used for synthesis of high energy intermediate ATP and NADHP. These two compounds will be later use in dark reaction for synthesis of food.

E) final electron acceptor in ETC is NADP.

Which accepts electron and using H+ ions converted in to NADPH