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- Melvin Calvin and Andrew Benson determined the steps in the light-independent reactions of photosynthesis by exposing the green alga Chlorella to CO2 labeled with the radioisotope carbon 14. By looking at which compounds the C14 ended up in, they were able to identify all intermediates in this cyclic pathway. Why did they predict correctly that the same set of intermediates would be formed in the light reaction in land plants?What is the significance that the combined absorption spectra of chlorophylls a and b roughly match the action spectrum of photosynthesis? Would photosynthesis be more efficient if their individual absorption spectra coincided exactly?DRAW a curved arrow mechanism for photosynthesis with the following steps. Step 1: Absorption of sunlight and excitation of chlorophyll molecules Step 2: Transfer of energy to reaction center chlorophylls, which lose an electron and become oxidized. Step 3: Electron transfer from oxidized chlorophylls to an electron acceptor, such as a quinone molecule Step 4: Electron transfer from the quinone molecule to a chain of electron carriers, such as cytochromes, which generate a proton gradient across the thylakoid membrane Step 5: ATP synthesis by ATP synthase using the energy of the proton gradient. Step 6: Transfer of electrons from the electron carriers to the enzyme rubisco, which catalyzes the carboxylation of ribulose bisphosphate (RuBP) with CO2, forming an unstable 6-carbon intermediate. Step 7: Cleavage of the 6-carbon intermediate into two 3-carbon molecules, which are phosphorylated by ATP and reduced by NADPH to form glyceraldehyde-3-phosphate (G3P) Step 8: Conversion of G3P to…
- Why would high temperatures reduce the efficiency of photosynthesis?Match the names of the components of the light dependent reactions to the numbers in the diagram below. ________Electron carrier 1. 1 ________Photosystem I 2. 2 ________Photosystem II 3. 3 ________ATP synthase 4. 4 ________Electron transport chain 5. 5 ________Thylakoid membrane 6. 6What is the general chemical equation of photosynthesis? Why doesn't that equation clearly show the real origin of the molecular oxygen liberated?
- Where is the electrochemical gradient located in the chloroplast? Why is it important? Why are the Light Independent Reactions important? Name the 3 stages of the Calvin Cycle? What is the function of ribulose bisphosphate, RUBISCO, glyceraldehyde 3- phosphate in the Calvin Cycle? How much energy is utilized? What is Carbon Fixation? What is Photorespiration? Why is it wasteful? Why are some plants called C4 plants and why are they important? How have they adapted to unfavorable climatic conditions? How do the activities of C4 plants compare with the activities of CAM plants?Which of the following statements about the light reactions of photosynthesis are correct? 1. Absorption of light does one thing: it makes chlorophyll easier to oxidize. 2. In PSII, the rate of damage to the D1 protein can never exceeds the rate of repair. 3. Electron transport is spontaneous (exergonic) as electrons move from P680* to P700+. 4. Compared to anoxygenic photosynthesis, in oxygenic photosynthesis less light needs to be absorbed to reduce NADP+. A. 1,2 and 3 B. 1 and 3 C. 2 and 4 D. 4 only E. All of 1,2,3 and 4 are correctWhy were chloroplasts selected for the pigment extraction in the virtual lab? The researcher in the virtual lab was using waste from a fish farm to provide nutrients for the algae. What was the algae going to be used for in order to reduce CO2 levels in the city? What plant pigment is responsible for light reaction in photosynthesis?
- Which of the following is true of chloroplastic ATP: Select one: a. it is made in the Calvin cycle and consumed in the light reactions b. it is used during photosynthesis, S assimilation, and N assimilation c. it does not leave the chloroplast, and is used to breakdown molecules d. it is made during photosynthesis and S assimilation e. it leaves the chloroplast, and is consumed in respiration and N assimilationDoes the diagram represent cyclic or non-cyclic photophosphorylation: ____________________ ? When the reaction center of photosystem II ejects a high energy electron, the electron is replaced by an electron from _______________. When the reaction center of photosystem I ejects an electron, the electron goes to _____________________. What two high energy molecules are produced during the light dependent reactions of photosynthesis: ______________ and _____________?What is the connection between photosynthesis and cellular respiration? Please explain thoroughly.