True or False? The following is the correct sequence for the movement of electrons during the light-dependent reactions of plants: A) P680 --> P700 --> water --> NADP+
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True or False?
The following is the correct sequence for the movement of electrons during the light-dependent reactions of plants: A) P680 --> P700 --> water --> NADP+
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- In photosynthesis, which of the following is NOT true about the light-dependent (“light”) reaction? In photosynthesis, which of the following is NOT true about the light-dependent (“light”) reaction? Glucose is synthesized from CO2 and water during the light-dependent reaction The light-dependent reaction converts light energy to chemical energy stored in ATP The light-dependent reaction (non-cyclic) captures electrons in NADPH Light-excited electrons in chlorophyll provide the energy for ATP production None of the other four answers (All are true of the light-dependent reaction)In plants, under what solution conditions are Calvin cycle and gluconeogenesis enzymes most active? 1 Low pH, low [Mg2+] Low pH, high [Mg2+] 2 High pH, low [Mg2+] 4 High pH, high [Mg2+]Which of the following is NOT true of photosynthesis? O The light-independent ("dark") reaction makes glucose from carbon dioxide (CO₂) and water, using energy trapped by the light-dependent reaction The light-dependent reaction captures electrons in NADPH, which are used for glucose synthesis in the light-independent ("dark") reaction None of the other four answers (all are true of photosynthesis) Light-excited electrons in chlorophyll provide the energy for ATP production The light-independent ("dark") reaction converts light energy to chemical energy stored in ATP
- For the following questions, choose one to discuss: chloroplast/photosynthesis State at the outset which one you will discuss. A) What role do proton gradients play in the process of photosynthesis proton gradients allow B) Where are proton gradients formed? Within what structures are they seen in chloroplasts How do the structures help them to maintain a gradient? C) Explain where and how the chloroplast or mitochondria uses passive transport and active transport to complete photosynthesis or cellular respiration.Identify the chemical basis for ApH and AY across the chloroplast thylakoid membrane by dragging the descriptions to their targets. Be sure to notice that the upper arrow iindicates ApH and the lower arrow indicates ΔΨ. ATP synthase complex H+ N ADP + P₁ Light energy ATP H*N Photosystem I/II- Chloroplast N side Aus PN ApH T + Thylakoid membrane HTp H+p Lumen Stroma P side Proton circuit A B High H concentration Low positive charge High positive charge Low H+ concentration Within the image, identify the types of proton translocation by dragging each label to its target. O XH₂ 2H+ + Z 2 H* ZH₂ O XH₂ Z 2H+ ZH₂ 2H+ C A B Proton pump Redox loopFor most plants, two distinct photosystems (Photosystem I and Photosystem II) work together in series during photosynthesis. These photosystems are complexes of proteins and pigment molecules. Statement 1: Photosystem I has an absorption maximum of 680 nm, whereas Photosystem II has an absorption maximum of 700 nm. Statement 2: The special pair of chlorophyll a molecules in the reaction center of photosystem I is designated as P700, whereas the special pair of chlorophyll a molecules in the reaction center of photosystem II is designated as P680. Statement 1 is true. Statement 2 is false. Statement 1 is false. Statement 2 is true. Both statements are true. Both statements are false.
- Carbon fixation in plants is catalyzed by what enzyme? What is the name given to an organism (plant, bacteria or algae) that can produce its own food from organic molecules specifically by using photosynthesis? Which molecule leaves the Calvin cycle to be converted into glucose? What is the overall purpose of cellular respiration in photosynthetic organisms? In which plant organ does photosynthesis most commonly occur? Question options: the root the stem the leaf the flowerIn photosynthesis, contrast the light reactions with the light independent reactions, in terms of goals, inputs, and outputs of each. Spatially where do they take place (which parts of the chloroplast)? (Optional, for further discussion: Could there be light reactions without light-independent reactions, or visa-versa?)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 correct
- Oil is a major energy-storage molecule in most seeds. During seed development in some plants, oil (triacylglycerols) is synthesized using acetyl CoA derived from sucrose. The developing seed also contains RuBP carboxylase, although the Calvin cycle is not active. (a) How does the carboxylase maximize the effi ciency of converting starch into oil? (b) The seeds that contain RuBP carboxylase are green, suggesting that they harvest some light energy. Explain why some energy collection would be useful in the developing seed.Which of the following is NOT true of photosynthesis? Light-excited electrons in chlorophyll provide the energy for ATP production The light-independent (“dark”) reaction makes glucose from carbon dioxide (CO2) and water, using energy trapped by the light-dependent reaction The light-dependent reaction captures electrons in NADPH, which are used for glucose synthesis in the light-independent (“dark”) reaction The light-independent (“dark”) reaction converts light energy to chemical energy stored in ATP None of the other four answers (all are true of photosynthesis)The following image is a schematic of the metabolic processes occurring in a plant contained in a closed container. A=Light Dependent reactions B=Glycolysis C=Light Independent Reactions D=Kreb's cycle E=electron transport chain 2a) Use the figure above to explain the conditions in which the oxygen concentration remains constant in the container. b) 2-carboxyarabinitol-1,5-bisphosphate (CABP) is an inhibitor of the enzyme rubisco. Which pathway would this affect most?