Bio 172 exam 2 photosynthesis
In which part of the chloroplast is there a high concentration of protons?
thylakoid lumen
How are the Calvin cycle and cellular respiration related in plants? All of the above are TRUE Some of the products from cellular respiration can be used in the Calvin cycle Oxidized carbon from cellular respiration can be used in the Calvin cycle Reduced carbon from the Calvin cycle can be used in glycolysis
A
Plants can use high energy (680 nm) and low energy (700 nm) light to stimulate photosystem II and photosystem I, respectively. If Photosystem I were inactivated by a drug, what would not be produced? NADPH FAD+ NAD+ Oxygen
A
Which of the following does NOT occur in both cyclic and noncyclic electron flow during photosynthesis? Oxygen production Pumping of protons from the stroma to the thylakoid lumen Resonance Chemiosmosis
A
Which of the following is FALSE about the cyclic electron flow during photosynthesis? Oxygen is the final electron acceptor in the electron transport chain The energy released by the electrons traveling down the electron transport chain is used to move protons across the thylakoid membrane Cyclic electron flow occurs on the thylakoid membrane Cyclic electron flow provides additional ATP needed to run the Calvin cycle
A
Which of the following is not needed for cyclic electron flow? NADPH Thylakoid membrane Photosystem I Antenna chlorophylls
A
Why can't the Calvin cycle run if the light reactions don't occur? Because the products of the light reactions are needed to run the Calvin cycle Because the light reactions occur during the day and the Calvin cycle can only run during the night Because the Calvin cycle doesn't produce quite enough NADPH to run without additional NADPH made in the light reactions Because the Calvin cycle doesn't produce quite enough ATP to run without additional ATP made in the light reactions
A
Why is photorespiration wasteful for photosynthetic organisms? It produces CO2 and consumes ATP It causes reactive oxygen species to form, which can harm photosynthetic tissues It produces ATP and consumes CO2 It denatures rubisco
A
Which of the following is true of ATP synthase
ATP synthase uses facilitated diffusion to transport protons down an electrochemical gradient
Which of the following is needed to keep the Calvin cycle going? Phosphofructokinase ADP + Pi O2 G3P
D
How are the Calvin cycle and cellular respiration related in plants? Reduced carbon from the Calvin cycle can be used in glycolysis All of the above are TRUE Some of the products from cellular respiration can be used in the Calvin cycle Oxidized carbon from cellular respiration can be used in the Calvin cycle
B
Which of the following is FALSE about the cyclic electron flow during photosynthesis? Cyclic electron flow occurs on the thylakoid membrane Oxygen is the final electron acceptor in the electron transport chain Cyclic electron flow provides additional ATP needed to run the Calvin cycle The energy released by the electrons traveling down the electron transport chain is used to move protons across the thylakoid membrane
B
Which of the following statements is TRUE regarding cellular respiration and photosynthesis? Photosynthesis occurs in plants, but respiration only occurs in animals Oxidative phosphorylation and photophosphorylation are both dependent on electron transport Photosynthesis requires ATP, but respiration does not Cellular respiration stores energy in complex organic molecules; photosynthesis releases the energy stored in complex organic molecules
B
Which of the following statements is a correct distinction between cyclic and noncyclic photophosphorylation? Chemiosmosis is unique to noncyclic electron flow Only cyclic electron flow can operate in the absence of photosystem II. Only noncyclic electron flow produces ATP In addition to ATP, cyclic electron flow also produces O2 and NADPH.
B
Which of the following would you expect to happen if the pH of the thylakoid lumen suddenly increased from pH 4 to pH 8? More NADP+ will be reduced to NADPH ATP production by photophosphorylation will decrease Less oxygen will be produced Electron transport will not occur
B
Why can't the Calvin cycle run if the light reactions don't occur? Because the light reactions occur during the day and the Calvin cycle can only run during the night Because the products of the light reactions are needed to run the Calvin cycle Because the Calvin cycle doesn't produce quite enough NADPH to run without additional NADPH made in the light reactions Because the Calvin cycle doesn't produce quite enough ATP to run without additional ATP made in the light reactions
B
Which of the following happens during photosynthesis? Light energy is used to reduce H2O Electrons are removed from CO2, which releases O2 ATP is produced in the cytoplasm of plant cells Carbon dioxide is reduced to G3P using energy generated from the light reactions
D
As electrons pass through the electron transport chain during the light reactions of photosynthesis, for what is the captured energy used? To produce ATP. To oxidize water. To generate a proton gradient. To produce NADPH.
C
C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + energy The hydrogen in H2O was reduced No molecule or element was reduced The oxygen in H2O was reduced The carbon in CO2 was reduced
C
Glyceraldehyde 3-phosphate (G3P) can be used as a building block for many carbon containing molecules in the cell. Glyceraldehyde 3-phosphate is a key intermediate in which processes: Glycolysis and Oxidative Phosphorylation Glycolysis and the Citric Acid Cycle Glycolysis and the Calvin Cycle The Citric Acid Cycle and the Calvin Cycle
C
How does the photosynthetic reaction center differ from the chorophyll molecules in the antenna complex? If no electron acceptor is available, only the antenna complex molecules will exhibit fluorescence. Only the reaction center absorbs photon energy. There is a loss of electrons in the reaction center and not the antenna complex. Only the antenna complex can accept electrons.
C
The light reactions accomplish all of the following except: Produce ATP and NADPH Convert energy from the sun into chemical energy Reduce CO2 Pass excited electrons from photosystem II to pheophytin
C
Which of the following is TRUE about processes that happen during photosynthesis? Cyclic electron flow moves electrons from the thylakoid lumen to the thylakoid matrix Photosynthesis provides all of the ATP required by plant cells Protons move across the thylakoid membrane down their concentration gradient so that ATP is produced O2 is produced after electrons are added to water molecules
C
What is happening during carboxylation?
CO2 is added to RuBp by rubisco
During photosynthesis
CO2 is reduced and H2O is oxidized
6H12O6 + 6 O2 → 6 CO2 + 6 H2O + energy No molecule or element was reduced The carbon in CO2 was reduced The hydrogen in H2O was reduced The oxygen in H2O was reduced
D
Atractyloside is compound produced by plants that can be fatal to humans. Atractyloside blocks the transport of ADP from the cytosol across the mitrochondrial membrane and into the mitrochondrial matrix which blocks ATP production. Atractyloside blocks ATP production because: NAD+ accumulates in the mitochondrial matrix NADH accumulates in the mitochondrial matrix No proton gradient is produced and the activity of ATP synthase is inhibited ADP is a necessary substrate for ATP synthase
D
The overall process of photosynthesis Produces CO2 from glucose Results in the oxidation of glucose and the reduction of O2 Produces ATP by substrate level phosphorylation Results in the oxidation of H2O and the reduction of CO2
D
We must eat plants (or animals that have eaten plants) in order to take in the chemical energy needed to support our metabolism. When we eat plants, the chemical energy that we take in is a direct result of which plant process? Photophosphorylation that creates lots of ATP The generation of NADH during the Citric Acid Cycle The splitting of water molecules by photosystem II to create O2 The reduction of carbon during the Calvin Cycle
D
What is FALSE about glyceraldehyde 3 phosphate (G3P)? Carbons in G3P might have originally been in CO2 The production of G3P is dependent on products from the light reactions G3P can be used as a carbon source for nearly every macromolecule in the cell 1 molecule of G3P has more potential energy than 1 molecule of glucose
D
Which of the following is not true of both mitochondria and chloroplasts? ATP is made as a result of chemiosmosis in both the mitochondria and the chloroplast Both the mitochondria and chloroplast use energy from electron transport to pump protons across a membrane Both the mitochondria and chloroplast use ATP synthase The electron transport chain is located on the inner mitochondrial membrane and on the inner membrane of the chloroplast
D
Which of the following is NOT a direct reactant or product of the Calvin cycle? RuBP NADP+ Glucose ADP
Glucose
In the overall photosynthesis reaction x is oxidized and x is reduced
H2O , CO2
During the light reactions of photosynthesis, in what chloroplast location (s) are are ATP and NADPH synthesized? Both are synthesized in the thylakoid space. ATP is made in the thylakoid space and NADPH in the stroma. ATP is made in the stroma and NADPH in the thylakoid space. Both are synthesized in the stroma.
I thought a but says d
Plants can use high energy (680 nm) and low energy (700 nm) light to carry out photosynthesis. What is not produced when plants use only low energy light for photosynthesis? ATP G3P Glucose Oxygen
Oxygen
he light available to plants growing in Michigan during the late fall is typically lower energy light (700 nm) than the light that Michigan plants are exposed to in summer months (680 nm). What would likely be TRUE? The amount of H2O consumed would be higher for the plants exposed to 680 nm light The Calvin cycle would be completely inactive in the fall The amount of O2 produced would be approximately the same in the summer and fall Plants growing in the summer months would use all of the high energy light to make ATP and the Calvin cycle would be inactive until fall Plants growing in the late fall would no longer make ATP via photophosphorylation
a
Oxygen is a ____________ inhibitor of rubisco.
competitive
During which phase of the Calvin cycle are both ATP and NADPH required?
reduction
