Ch. 10(2)

Which term describes ATP production resulting from the capture of light energy by chlorophyll?
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Terms in this set (44)
Which term describes ATP production resulting from the capture of light energy by chlorophyll?
Photophosphorylation
True or false? The chemiosmotic hypothesis states that the synthesis of ATP generates a proton gradient that leads to electron flow through an electron transport chain.
False. The chemiosmotic hypothesis states that the flow of electrons through an electron transport chain generates a proton gradient that leads to the synthesis of ATP.
According to the chemiosmotic hypothesis, what provides the energy that directly drives ATP synthesis?
Proton Gradient
Which of the following particles can pass through the ATP synthase channel?
Protons
True or false? The region of ATP synthase that catalyzes the production of ATP from ADP and inorganic phosphate spans the chloroplast membrane.
False. The region of ATP synthase that catalyzes ATP production protrudes out of, but does not span, the chloroplast membrane; the region that spans the membrane is an ion channel through which protons can pass.
Chloroplast membrane vesicles are equilibrated in a simple solution of pH 5‎ . The solution is then adjusted to pH 8‎ . Which of the following conclusions can be drawn from these experimental conditions?
ATP will not be produced because there is no ADP and inorganic phosphate in the solution.
_____ has a longer wavelength than _____.
red and green
Which of these phosphorylates ADP to make ATP?
E. ATP synthase phosphorylates ADP.
_____ releases energy that is used to pump hydrogen ions from the stroma into the thylakoid compartment.
B. The energy released as electrons are passed along the electron transport chain is used to pump protons into the thylakoid compartment.
_____ splits water into 1/2 O2, H+, and e- .
A. Photosystem II splits water into 1/2 O2, H+, and e-
Energized electrons from ____ are used to reduce NADP+.C. Energized electrons from photosystem I are used to reduce NADP+Chlorophyll can be found in _____.A and C. The photosystems contain chlorophyll.Which of the following is the correct order of electron flow in the light reactions of photosynthesis?H2O → P680 chlorophyll a pair → PS II primary electron acceptor → Pq → cytochrome complex → Pc → P700 chlorophyll a pair → PS I primary electron acceptor → Fd → NADPHWhen a pigment molecule in a light-harvesting complex absorbs a photon of light, what happens to its excited-state electron?The electron falls back to its ground state, while passing its excited-state energy to an electron in a nearby pigment molecule.How many electrons at a time are passed between the pigment molecules in the light-harvesting complexes?0For every molecule of O2 that is released by photosystem II, _________ H2O molecules are needed, which together pass _________ electrons to the PS II reaction-center complex.2, 4Why is it correct to say that the linear electron flow of the light reactions directly captures energy in NADPH but only indirectly captures energy in ATP?Electrons are directly transferred to NADP+ to form NADPH, but electron flow is used to generate a proton gradient for ATP synthesis. Electrons are not directly transferred to ATP.If the Calvin cycle slows down, what will happen to the rate of O2 production in PS II, and why?O2 production will slow down because less NADP+ will be regenerated in the Calvin cycle.Which process produces oxygen?photosynthesisWhich set of reactions uses H2O and produces O2?light dependent reactionsWhat is the importance of the light-independent reactions in terms of carbon flow in the biosphere?The light-independent reactions turn CO2, a gas, into usable carbon in the form of sugars.True or false? The light-dependent reactions of photosynthesis use water and produce oxygen.TrueWhich of the following molecules is the primary product of photosystem I?NAPDHWhat is the biological significance of the light-independent reactions of photosynthesis?They convert carbon dioxide to sugar.Which of the following statements best describes the relationship between the light-dependent and light-independent reactions of photosynthesis?The light-dependent reactions produce ATP and NADPH, which are then used by the light-independent reactions.Which molecule is regenerated in the regeneration phase of the Calvin cycle? Without regeneration of this molecule, the Calvin cycle would stop.RuBPCarbon fixation involves the addition of carbon dioxide to _____.RuBPAfter 3-PGA is phosphorylated, it is reduced by _____.NAPDHHow many carbon dioxide molecules must be added to RuBP to make a single molecule of glucose?6In the Calvin cycle, how many ATP molecules are required to regenerate RuBP from five G3P molecules?3Which of the following is(are) produced by the light reactions of photosynthesis?oxygen, ATP, and NADPHWhen light strikes chlorophyll molecules of PS II, they lose electrons, which are ultimately replaced by __________.electrons released by splitting waterBased on the accompanying figure, which of the following wavelengths of light is most effective in driving photosynthesis?440 nmIn autumn, chlorophyll is degraded in the leaves of deciduous trees. Which of the following statements best explains the change in color from green to shades of yellow, orange, or red?Other pigments such as carotenoids remain in the leaves after the chlorophyll is degraded.Which of the following processes is driven by the free energy released as electrons move through photosystem II and I in the thylakoid membranes?establishment of a proton gradientWhich of the following molecules is the final electron acceptor for electrons from photosystem I?NADP+Which of the following describes the function of the pigment molecules in a light-harvesting complex in the thylakoid membranes?They absorb and transfer light energy to the reaction-center chlorophyll.Which of the following processes is directly associated with photosystem I?receiving electrons from the thylakoid membrane electron transport chainWhat are the products of linear electron flow in the light reactions of photosynthesis?ATP and NADPHIf various plant cell membranes are isolated and incubated with a proton gradient across the isolated membrane in the presence of ADP and Pi, which of the following samples are most likely to be able to synthesize ATP?thylakoid membrane and inner mitochondrial membraneWhich of the following events are associated with chemiosmosis in chloroplasts?The pH of the thylakoid space increases and ATP is synthesized.Which of the following statements best describes the relationship between photosynthesis and cellular respiration?Photosynthesis stores energy in complex organic molecules; cellular respiration releases energy from complex organic molecules.In a plant, which of the following reactions produces molecular oxygen (O2)?the light reactions aloneThe mechanism of photophosphorylation is most similar to which of the following processes?oxidative phosphorylation in cellular respiration