Photosynthesis Review Grudge Ball! Frisbee!

Question 1 What is the final product of the Calvin Cycle? PGAL or G3P

Question 2 Which three things can limit the rate of photosynthesis? CO2, temperature, light

Question 3 During what stage of photosynthesis is O2 formed? Light-dependent reactions

Question 4 Name three pigments. Carotene, xanthophylls, anthocyanin, chlorophyll a, chlorophyll b

Question 5 Name two ways we could measure the rate of photosynthesis. Rate of products (oxygen, PGAL) formed, rate of reactants (CO2, water) consumed

Question 6 What is the first stage of the Calvin Cycle? Carbon Fixation

Question 7 How many carbons are in each of the following molecules: PGA, PGAL, RuBP 3, 3, 5

Question 8 Where do the light-dependent reactions take place? Thylakoid membrane

Question 9 What is the source of the oxygen atoms released during photosynthesis? Water

Question 10 Where does the Calvin Cycle take place? The stroma of the chloroplast

Question 11 What are the possible fates of PGAL and how many molecules (out of six) go towards each fate? Regeneration of RuBP (5) or biosynthetic pathways (1)

Question 12 What is the name of the enzyme that catalyzes carbon fixation? Rubisco

Question 13 What is the energy source for ATP Synthase? Electrochemical gradient across the thylakoid membrane

Question 14 Why do leaves change color in the fall? The chlorophylls stop being used as much and the accessory pigments that are usually overwhelmed now reflect different colors that become visible to us

Question 15 What are the four main structures of the light-dependent reactions? PSII, PSI, ETS, ATP Synthase

Question 16 What are the products of the light-dependent reactions that go on to the Calvin cycle? ATP, NADPH

Question 17 What is photoinhibition? Occurs when light intensity is so high that photons damage the plant cells (radiation)

Question 18 When does photorespiration occur? When there is too much O2 (or too little CO2?)

Question 19 Where does RuBP appear in the final Calvin cycle equation? Trick Question: Nowhere, it’s an intermediate!

Question 20 How is the electrochemical gradient in the light dependent-reactions formed? From the ETS

Question 21 What is this? Stroma

Question 22 What is this? Granum

Question 23 Which color of light would have the lowest rate of photosynthesis? Green

Question 24 Why is calling the Calvin cycle the “dark reactions” a misnomer? They do not occur in the dark, they need the inputs from the light-dependent reactions in order to run and therefore cannot function for very long without a light source

Question 25 Where is there an absorption peak for retinal? About 500-620 nm

Question 26 What color would leaves that only had β-carotene appear to us? Yellow/orange/red

Question 27 What are the three energy conversions that occur during photosynthesis? Absorption of light, light-dependent reactions, light-independent reactions (Calvin cycle)