Which of the following represents a correct sequence in non-cyclic photophosphorylation? a. photosystem I -> ATP production -> photosystem II -> NADPH production b. photosystem II -> ATP production -> photosystem I -> NADPH production c. photosystem I -> NADPH production -> photosystem II -> ATP production d. photosystem II -> NADPH production -> photosystem I -> ATP production

Which of the following represents a correct sequence in non-cyclic photophosphorylation? a. photosystem I -> ATP production -> photosystem II -> NADPH production b. photosystem II -> ATP production -> photosystem I -> NADPH production c. photosystem I -> NADPH production -> photosystem II -> ATP production d. photosystem II -> NADPH production -> photosystem I -> ATP production

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter8: Photosynthesis

Section: Chapter Questions

Problem 2TYK

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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 function
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?
Which of the following changes would decrease ATP production in the light-dependent reactions of photosynthesis? a. decreasing the pH of the thylakoid lumen b. decreasing the pH of the chloroplast stroma c. increasing the concentration of NADP+ in the chloroplast stroma d. making the thylakoid membrane freely permeable to protons by adding a proton channel e. two of the above would decrease ATP production
The role of photosystem 1 and photosystem 2 in the process of photosynthesis is to a. absorb sunlight and distribute the energy as heat b. absorb sunlight and transfer the energy to electrons c. form ATP as hydrogen ions cross the thylakoid membrane d. transfer electrons to form NADPH
The investigator suggested that insufficient amounts of carbon dioxide in the water may have been one of the factors that prevented further increases in the rate of photosynthesis at higher light intensities. Why would inadequate amounts of carbon dioxide affect the rate of photosynthesis? Select one or more: a. Carbon dioxide is needed for the production of sugars in the light reactions of photosynthesis b. Carbon dioxide is needed for the production of sugars in the Calvin Cycle of photosynthesis c. Carbon dioxide is needed for the production of ATP in the Calvin Cycle d. Carbon dioxide is the source of oxygen in photosynthesis e. Carbon dioxide is needed for the production of ATP in the light reactions of photosynthesis
Which of the following occurs ONLY in photosystem I and NOT in photosystem II? a. The energy of exited electrons is passed from one chlorophyll molecule to the next through resonance transfer b. Light energy is harvested by chlorophyll molecules c. A water molecule is split to provide electrons to a special chlorophyll A pair d. Energy harvested in the light-harvesting complexes excites electrons that can be used directly to reduce NADP+ to NADPH e. High-energy electrons are donated to an electron transport chain
Under certain conditions, the thylakoid membrane of the chloroplast may become 'leaky’ allowing ions to freely diffuse across it. A consequence of that is carbon fixation will stop. Why would the Calvin Cycle stop? A. Because oxidation of water by PSII would stop. B. Because reduction of NADP+ to NADPH would stop. C. Because the stroma would contain ADP but no ATP. D. Because levels of G3P in the stroma would increase.
How does the electron transfer pathway from photosynthesis II to photosynthesis I in the light-dependent reactions take place? A. After splitting water in PS-I, high-energy electrons are delivered through the chloroplast electron transport chain to PS-II. B. After the photosynthesis reaction, released products like glucose help in the transfer of electrons from PS-II to PS-I. C. After splitting water in PS-II, high-energy electrons are delivered through the chloroplast electron transport chain to PS-I. D. After the completion of the light-dependent reactions, the electrons are transferred from PS-II to PS-I.
Which of the following descriptions about photorespiration is not correct? Select one: a. Rubisco binds O2 instead of CO2. b. Carbon dioxide is released without producing ATP. c. It limits damaging products of light reactions that build up in the absence of the Calvin cycle at low CO2 concentrations. d. Peroxisomes and mitochondria rearrange and split the compound made by rubisco to fix CO2. e. It occurs in hot and dry conditions.
The light dependent reactions of photosynthesis are characterized by A. oxidation of carbon dioxide, release of oxygen, synthesis of glucose. B. release of oxygen, fixation of carbon dioxide, hydrolysis of ATP. C. oxidation of water, reduction of NADP+ , hydrolysis of ATP. D. reduction of oxygen, oxidation of NADPH, formation of ATP. E. oxidation of water, reduction of NADP+ , formation of ATP.
Since carotenoids are part of the _________, their electrons are not passed on when they get excited. A) electron carriers of the photosystem B) electron transport chain C) antenna complex of the photosystem D) reaction center of the photosystem
The excited electron from photosystem I a. can be returned to the reaction center to generate ATP by cyclic photophosphorylation. b. is replaced by oxidizing H2O. c. is replaced by an electron from photosystem II. d. Both a and c are correct.