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What is the overall outcome of the light reactions in photosynthesis?
- NADPH and ATP molecules are produced during the light reactions and are used to power the light independent reactions.
- NADPH and ATP molecules are produced during the light reactions, which are used to power the light dependent reactions.
- Sugar and ATP are produced during the light reactions, which are used to power the light independent reactions.
- Carbon dioxide and NADPH are produced during the light reactions, which are used to power the light dependent reactions.
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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?Match each term with its most suitable description. ____ PGAL formation a. absorbs light ____CO2 fixation b. converts light to chemical energy ____ autotroph c. self-feeder ____ ATP forms NADPH does not d. electrons cycle back to photosystem ____ photorespiration e. problem in C3 plants ____ photosynthesis f. Calvin-Benson cycle product ____ pigment g. water molecules split ____ photolysis in photosynthesis h. rubisco functionWhich part of the Calvin cycle would be affected if a cell could not produce the enzyme RuBIsCO?
- Photosynthesis directly opposes respiration in determining how plants influence atmospheric CO2 concentrations. When a leaf is in the light, both photosynthesis and respiration are occurring simultaneously. The data in the Table were collected from the leaf of a sagebrush plant that was enclosed in a chamber that measures the rate of CO2 exchange. The same leaf was used to collect the data in Interpret the Data in Chapter 7. Respiration is shown as a negative and photosynthesis as a positive rate of CO2 exchange. The net photosynthesis rate is the amount of CO2 (in micromoles per square meter per second) assimilated by the leaf while respiration is occurring; a positive value indicates more photosynthesis is occurring than respiration. The light exposed to the leaf is quantified as the number of photons in the 400 to 700 nm wavelength, the photosynthetic photon flux density (PPFD); 2,000 mol/m2/s is equivalent to the amount of light occurring at midday in full Sun. Observation Photosynthetic Photon Flux Density (PPFD) (mol/m2/s) Net Photosynthesis (mol/m2/s) 1 2,000 9.1 2 1,500 8.4 3 1,250 8.2 4 1,000 7.4 5 750 6.3 6 500 4.8 7 250 2.2 8 0 -2.0 Why is net photosynthesis negative when PPFD is zero? Looking at the respiration data from Interpret the Data in Chapter 7, at what temperature do you think these data were collected? Source: Data based on unpublished research by Brent Ewers, University of Wyoming.What is the molecule that leaves the Calvin cycle to be converted into glucose? a. ADP b. G3P c. RuBP d. 3-PGAWhich of the following substances does not participate in the Calvin-Benson cycle? a. ATP c. NADPH e. PGAL b. O2 d. RuBP f. CO2
- Is the following statement true or false? Unlike animals, which make many ATP by aerobic respiration, plants make all of their ATP by photosynthesis.What are the roles of ATP and NADPH in photosynthesis? a. ATP and NADPH are forms of chemical energy produced from the light dependent reactions to be used in the light independent reactions that produce sugars. b. ATP and NADPH are forms of chemical energy produced from the light independent reactions, to be used in the light dependent reactions that produce sugars. c. ATP and NADPH are forms of chemical energy produced from the light dependent reactions to be used in the light independent reactions that produce proteins. d. ATP and NADPH are forms of chemical energy produced from the light dependent reactions to be used in the light independent reactions that use sugars as reactants.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)
- 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 main purpose of the light reactions in photosynthesis is Group of answer choices to take the high energy electrons out of glucose. to generate ATP and NADPH to send to the Calvin Cycle. to produce all the ATP the plant cell needs for its cellular work. to produce enough oxygen gas for humans to survive.Which of the following scenarios happens during the light-dependent reaction of photosynthesis? Oxygen gas is produced in the thylakoid lumen by the oxidation of water by photosystem I. Ferrodoxin and NADP+ reductase participates in the reduction of NADP+ to NADPH. Carbon dioxide enters the plants via stomata. Rubisco attaches three molecules of ribulose bisphosphate (RuBP) to one molecule of carbon dioxide.
