Take a white board and marker from the front Light Reaction Review Take a white board and marker from the front

Q1: Where do the light reactions take place? In the stroma Outside of the chloroplasts In the thylakoid membranes Only in chlorophyll molecules

Q2: Which of the following is inside the thylakoid membrane Electron transport chain Photosystem I ATP synthase All of these

Q3: What is letter A? Water Photon of Light ATP Photosystem

Q4: What does letter B depict Reaction Center Antenna Photosystem I Photosystem II

Q5: Where does the photon of light first hit? the reaction center of photosystem I the reaction center of photosystem II the antenna of photosystem I the antenna of photosystem II

Q6: Which letter in the picture contains the reaction center M C D

Q7: How does the photon of light get into the reaction center? That is where the photon originally goes The photon never goes to the reaction center The antenna molecules will pass the photon’s energy to the reaction center

Q8: What are all of the pigments that are in the antenna? Chlorophyll a and chlorophyll b Chlorophyll b and xanthophyll Chlorophyll b, carotene and xanthophyll Chlorophyll b, carotene, xanthophyll and chlorophyll a

Q9: Which region of the visible spectrum is not absorbed well by chlorophyll? blue green violet red

Q10: What happens in the reaction center? The photon of light gets excited and is passed onto the primary acceptor The photon of light excites a proton and the proton is passed onto the primary acceptor The photon of light excites an electron and it immediately enters the ETC (electron transport chain) The photon of light excites an electron and the electron is passed to the primary acceptor

Q11: Which letter represents the primary electron acceptor? D

Q12: How is the electron replaced in photosystem II? The electron from PSI exits the ETC and replaces it. Water is split and the H+ ions enter the photosystem Water is split and the electrons enter the photosystem Electrons enter from the stroma

Q13: Which side is the lumen? K. L

Q14: What happens to the electron as it goes down the ETC? The electron gains energy as it moves through the chain The electron doesn’t do anything, just remains in the chain The electron releases energy as it moves through the chain

Q15: How do H+ ions cross the membrane? They take the energy expelled from the electrons and cross They do not, electrons cross the membrane They give energy to the electrons in order to cross

Q16: Why do H+ ions require energy to go from the stroma into the lumen? There is a high concentration of H+ ions in the stroma and low in the lumen There are equal amounts of H+ ions in the stroma and lumen There is a low concentration of H+ ions in the stroma and high in the lumen

Q17: What happens to the H+ ions in the lumen? They want to diffuse out because they want to move from high  low They are content to stay there forever They want to diffuse out because they want to move from low  high

Q18: Why are there so many H+ ions in the lumen? Because all of them cross from the stroma When water is split, the H+ remain in the lumen

Q19: How do the H+ leave the lumen and enter the stroma? Through the ETC chain They diffuse through the phospholipid bilayer They leave through ATP synthase

Q20: Which letter depicts ATP synthase enzyme? G B J M

Q21: What happens with ATP synthase? The H+ release energy that ADP absorbs to create ATP and then they are available for more reactions The H+ ions are absorbed into ADP to create ATP The H+ release energy that ADP absorbs to create ATP, and then they disintegrate

Q22: Where is photosystem I? B G M

Q23: What is the path of a photon’s energy? Antenna  reaction center  ETC reaction center  ETC Antenna  reaction center  primary electron acceptor  ETC Antenna primary electron acceptor reaction center  ETC

Q24: How is NADPH created? NADP+ and an electron from the ETC and an H+ ion from the lumen NADP+ and 2 electron from the ETC and an H+ ion from the lumen NADP+ and 2 electron from the stroma and an H+ ion from the stroma NADP+ and 2 electrons from the ETC and an H+ ion from the stroma

Q25:How is the electron lost in PSI replaced? The electron from PSII flows down the ETC and enters PSI The electrons from the lumen enter PSI The electrons in the stroma enter PSI When water is split, the electrons enter PSI