8.2 Photosynthesis Honors Assessment

Which photosynthesis reaction takes place in the thylakoid membrane? Light dependent cycle

What are photosystems and where are they located? Photosystems are protein complexes with light absorbing pigments Located in thylakoid membrane

3. What happens to photosystem II when light strikes it? Electrons in photosystems are excited and H2O is split

What happens during the first step of the light dependent cycle? electron released in electron transport system, a hydrogen ion (H+) released into thylakoid space O2 leaves thylakoid space as a waste product.

5. Why is the splitting of water so important in the light dependent cycle? Electrons are released to electron transport chain H+ are released to thylakoid membrane

What happens to oxygen after it splits from hydrogen in water? Two oxygen molecules will join and leave thylakoid membrane

7. What happens to excited electrons after they leave photosystem II 7. What happens to excited electrons after they leave photosystem II? Electrons move along from one electron acceptor to another.

8. Explain the naming of the electron transport chain. Electrons are transported along the electron acceptors in the thylakoid membrane.

9. What does light do to PSI in step 3? Excites electrons What high energy molecule is formed as a result of PSI? NADPH

11. In the fourth step of the light dependent cycle the accumulation of H+ in the thylakoid space leads to what process? chemiosmosis

What does ATP synthase do in the fourth step? Makes ATP 13. What two molecules are needed to fuel the light independent cycle? NADPH & ATP

What is the other reactant needed for the light independent cycle? CO2 What happens to the molecules NADPH and ATP in the light independent cycle (Calvin Cycle)? Their energy is used up and the molecules are turned back into NADP and ADP.

16. What is the importance of the enzyme, rubisco 16. What is the importance of the enzyme, rubisco? Converts the remaining G3P molecules into 5 carbon compounds