During photosynthesis, electrons from the reaction center chlorophyll are transferred to the...
Question:
During photosynthesis, electrons from the reaction center chlorophyll are transferred to the electron transport system. These electrons are replaced by the splitting of _____ molecules.
a. carbon dioxide
b. ATP
c. water
d. glucose
Electrons and Photosynthesis:
In the light reactions of photosynthesis, NADPH is produced when electrons are transferred to NADP+ through a series of electron transport chains located on the thylakoid membranes.
Answer and Explanation: 1
Become a Study.com member to unlock this answer! Create your account
View this answerDuring photosynthesis, electrons from the reaction center chlorophyll are transferred to the electron transport system. These electrons are replaced...
See full answer below.
Ask a question
Our experts can answer your tough homework and study questions.
Ask a question Ask a questionSearch Answers
Learn more about this topic:

from
Chapter 7 / Lesson 8Explore the light reaction of photosynthesis. Learn about the location, reactants, and products of light dependent reactions and photolysis in the lesson below.
Related to this Question
- During photosynthesis, electrons from the reaction center chlorophyll are transferred to the electron transport system. These electrons are replaced by the splitting of ______ molecules. a. glucose b. carbon dioxide c. water d. ATP
- When electrons in the reaction center of Photosystem II are passed to an energy-acceptor molecule, they are replaced by electrons that have been given up by a. oxygen. b. glucose. c. carbon dioxide. d. water.
- ATP is produced during the light reactions of photosynthesis. This ATP is used to in the Calvin Cycle. a. split water into oxygen gas and hydrogen b. produce NADP c. reduce carbon dioxide into glucose d. None of these are correct
- Photosynthesis is the process where energy is collected and ______ is released. (a) carbon dioxide (b) glucose (c) oxygen (d) chloroplast.
- The electrons lost by a chlorophyll molecule during photosynthesis are: A) Replaced by electrons from water molecules B) Replaced by hydrogen ions C) Replaced by the breakdown of ATP D) Not replaced
- During the light reactions of photosynthesis, ATP is produced when hydrogen ions move a. down a concentration gradient from the thylakoid space to the stroma. b. against a concentration gradient from the thylakoid space to the stroma. c. down a concent
- Photosynthesis is the process where energy is collected and what is released? A. Carbon Dioxide B. Glucose C. Oxygen D. Chloroplast
- In the chloroplast, ________ is converted into sugar by photosynthesis. (a) cellulose (b) oxygen (c) chlorophyll (d) carbon dioxide.
- In the light reaction during photosynthesis, which best explains why water is split (oxidized)? a. It supplies H+ to P 700 in PS 11 b. It is a source of energy c. It is the terminal electron acceptor d. It replaces electrons in electron acceptors in PS
- The electrons for the reduction reaction in photosynthesis come from a. carbon dioxide b. water c. carbohydrate d. oxygen
- During the light-dependent reactions of photosynthesis,: a. carbon dioxide is split into oxygen, carbon, electrons, and protons b. NADP+is reduced to NADPH c. enough ATP molecules are synthesized to power all other cellular functions d. electrons pass thr
- The Light-independent reactions of photosynthesis are those that: a.convert glucose into energy b.convert water into hydrogen and oxygen c.convert C o 2 into reduced molecule d.Convert chlorophyll into Energy.
- For photosynthesis in green plants, the electron donor for the light-dependent reaction is _____. (a) carbon dioxide (b) oxygen (c) water (d) chlorophyll (e) RuBP.
- The light reaction of photosynthesis does not include: a. chemiosmosis b. oxygen liberation c. glucose synthesis d. electron transport
- Which of the following does Not occur in the light reaction of photosynthesis? a. Chlorophyll in the thylakoid absorbs solar energy. b. Water is split, providing electrons and giving off O2. c. ATP is generated. d. Carbon from the atmosphere is turned in
- Which of the following does not occur in the light reactions of photosynthesis? a. Chlorophyll in the thylakoid absorbs solar energy. b. Water is split, providing electrons and giving off O2. c. ATP is generated. d. Carbon from the atmosphere is turned in
- The oxygen released from photosynthesis comes from a. water b. RuBP c. glucose d. carbon dioxide e. Calvin cycle
- Photosynthesis is: a. not dependent on chlorophyll. b. a process that produces glucose and oxygen. c. a process that produces water and carbon dioxide.
- In photosynthetic cells, the synthesis of ATP by the chemiosmotic mechanism occurs during ________. (a) photosynthesis only. (b) respiration only. (c) both photosynthesis and respiration. (d) neither photosynthesis nor respiration. (e) photorespiration...
- During photosynthesis, which of the following happens? a. Carbon dioxide is reduced to glucose. b. Chloroplasts convert solar energy to ADP. c. Hydrogen atoms reduce water to glucose. d. Water is hydrolyzed.
- The oxygen molecule in glucose formed during photosynthesis comes from: a. Water b. Organic acids c. CO_2 d. Atmospheric gases e. Oxygen produced in the chloroplasts.
- As electrons move through the electron transport chain, energy is released. This energy is directly used to: A. break glucose into 2 pyruvates. B. regenerate ADP and Pi from ATP. C. pump protons across a membrane. D. break down water into oxygen and hydro
- Which of the following are reactants of the light reactions of photosynthesis? A. Glucose B. Water C. ATP D. NADP E. Light energy F. NADPH G. Carbon dioxide H. Oxygen
- In photolysis, some of the energy captured by chlorophyll is used to split (a) CO2 (b) ATP (c) NADPH (d) H2O (e) both b and c
- In Photosynthesis, where do the carbon atoms in glucose come from? a.carbon dioxide b.water c.NADPH d.sunlight
- The energy source for the process of photosynthesis is: a. oxygen. b. sunlight. c. carbon dioxide. d. chlorophyll glucose.
- O_2 released in the process of photosynthesis comes from A. carbon dioxide B. water C. sugar D. pyruvic acid
- The oxygen released from photosynthesis comes from: a. carbon dioxide b. RuBP c. glucose d. water.
- The light reactions occur in the [{Blank}] with [{Blank}] as a reactant. a. thylakoid membrane; water b. stroma; oxygen c. chlorophyll; carbon dioxide d. chloroplasts; glucose
- After a chlorophyll molecule loses an electron in the photosystem 1 reaction, how is the electron replaced? a. It gains an electron from the P700 system. b. It gains an electron from NADPH + H+. c. It gains an electron from ATP. d. It gains an electron fr
- Light dependent reactions _______. a. capture the energy of sunlight with chlorophyll in PS I & PS II b. make ATP & NADPH using electron transport chains c. energize electrons in both PSI & PSII d. include both cyclic and noncyclic pathways e. all of
- Energy for the Calvin cycle is supplied by from the light reactions. a. carbon dioxide and water b. ATP and NADPH c. carbon dioxide and ATP d. ATP and water e. electrons and hydrogen ions
- Oxygen is released in photosynthesis by: a. Photophosphorylation b. Photolysis of water c. Photorespiration d. Photons
- Photon energy, captured by chlorophyll a, is transferred as chemical energy to _____. a) carbon dioxide b) glucose c) other chlorophyll d) carotenoids e) a series of hydrogen acceptors
- The process of photosynthesis: a. breaks down sugars to create ATP. b. traps light energy in an energy carrier like ATP. c. produces carbon dioxide. d. occurs in some animal cells.
- Which of the following does not occur during the light-dependent reactions of photosynthesis? a. ATP synthesis b. Oxidation of water c. Carbon fixation d. Electron transport
- In photosynthesis, ATP is made by 1) chemiosmosis. 2) glycolysis. 3) the Krebs cycle. 4) the Calvin cycle. 5) the passing of electrons from photosystem.
- O_2 released in the process of photosynthesis comes from _______. (a) CO_2 (b) water (c) sugar (d) pyruvic acid.
- Photosynthesis is important to the planet because it releases _____. a) both ATP and oxygen b) oxygen c) carbon dioxide d) NADH e) ATP
- Photosynthesizing plants rely on water to a) replace electrons that are excited by light energy and passed from molecule to molecule down an electron transport chain. b) replenish oxygen molecules that are lost during photosynthesis. c) provide the pro
- The set of reactions that used NADPH and ATP formed in the light-capturing reactions to drive into the fixation of CO 2 a.) autotrophs b.) Calvin Cycle c.) carotenoids d.) chlorophyll e.) heterotrophs f.) NADP+/NADPH g.) photons h.) photosystem i
- What are the reactants of photosynthesis? a. Carbon dioxide + glucose b. Carbon dioxide + water + light energy c. Water + light energy + glucose d. Glucose + oxygen
- The electrons that are excited by light energy in photosystems II and I are eventually used to: a. breakdown RuBP b. convert glucose to carbon dioxide c. breakdown starch into glucose d. reduce NADP+ to NADPH
- The electrons lost by the P700 reactive center are replaced from: a. a water molecule. b. solar energy. c. ATP. d. NADP+. e. Photosystem II.
- The electrons excited by sunlight are replaced by electrons from _____ in photosystem I, and by electrons from _____ in photosystem II. A) water; photosystem I B) water; carbon dioxide
- If the energy source for the light-dependent reaction of photosynthesis is sunlight, what energy is needed to fuel the carbon fixation reaction? a. ADP b. sunlight c. C o 2 d. ATP and NADPH e. ATP synthase
- Photosynthesis is a redox reaction. Which of the following is oxidized during the process? a. carbon dioxide b. water c. carbohydrate d. oxygen
- Select the correct answer. In photosystem II, after pigment molecules donate excited electrons to the reaction center, electrons are taken from [{Blank}] to replace them. a. carbon dioxide b. water c. sugar d. sunlight
- The oxidized and reduced forms of the electron carrier used in photosynthesis a.) autotrophs b.) Calvin Cycle c.) carotenoids d.) chlorophyll e.) heterotrophs f.) NADP+/NADPH g.) photons h.) photosystem i.) stomata j.) thylakoids
- In the chloroplasts of green plants the photosynthetic electron transport chain does all of the following except: a. take place in the thylakoid b. establish a gradient by pumping protons into the thylakoid space c. produce O2 d. Use NADH as an electro
- All of the following occur in the light reactions of photosynthesis EXCEPT: A. Electrons from water are donated to an electron "hole" left behind after an electron is excited and transferred to an electron acceptor in Photosystem II. B. Light activates pi
- The light-harvesting reactions of photosynthesis: a. use H2O as the initial electron donor. b. occur in the stroma in the chloroplasts. c. utilize the ATP and NADPH produced by the CO2-fixation reactions. d. all of the above e. a and b, but not c
- In both photosynthesis and respiration, a hydrogen ion gradient is produced and then used to produce ATP through the action of transport/enzyme proteins. This overall process is called what?
- Photosynthesizing plants rely on water to: a) replace electrons that are excited by light energy and passed from molecule to molecule down an electron transport chain. b) replenish oxygen molecules that are lost during photosynthesis. c) provide the proto
- In photosynthesis, the electrons move down the electron transport chain. Where do they come from?
- Photosynthesis is the process by which: a. carbon dioxide is synthesized. b. glucose is synthesized. c. plants burn energy. d. glucose and other molecules are broken down.
- The light reactions of photosynthesis yield three products. They are: a. O_2, NADPH, and ATP. b. CO_2, NADP^+, and ATP. c. O_2, NADP^+, and ATP. d. H_2O, NADPH, and ATP.
- The oxygen produced during photosynthesis comes from: a. water b. carbohydrates c. carbon dioxide d. the air plants take in e. the atmosphere
- Photosynthesis is the process by which: a. glucose and other molecules are broken down. b. glucose is synthesized. c. carbon dioxide is synthesized. d. plants burn energy.
- Through the light reaction, chloroplasts convert the energy into chemical forms and store it in the molecules of and, which are in the stroma/matrix of the chloroplast.
- In photosynthesis, carbon dioxide (CO_2) is converted to glucose. During this process, the carbon atoms A) Are hydrated because water (H_2O) is added to the system. B) Are energetically coupled to the reduction of water to oxygen gas (O_2). C) Are oxidize
- Which of the following are products of the light reactions of photosynthesis? A. Glucose B. Water C. ATP D. NADP E. Light energy F. NADPH G. Carbon dioxide H. Oxygen
- What are reactants of photosynthesis? A. Carbon dioxide, water, and sunlight B. Carbon dioxide, oxygen, and water C. Sugar and oxygen D. Carbon dioxide, sunlight, oxygen, water, and sugars
- O_2 released in the process of photosynthesis comes from {Blank}. A. CO_2 B. water C. sugar D. pyruvic acid
- Involves an electron transport chain. A. Both respiration & photosynthesis B. Respiration C. Photosynthesis
- Photosynthesis is the process by which plants convert radiant energy from the sun to chemical energy. The rate at which photosynthesis occurs is dependent upon three main variables: light, Carbon dioxide (CO2) concentrations, and temperature. How would t
- The immediate source of energy for ATP synthesis in chloroplasts and photosynthetic bacteria is: A. Electron transport B. The electrochemical proton gradient (PMF) C. Light D. Energized chlorophylls E. NADPH
- If a thylakoid were punctured so that its interior was no longer separated from the stroma, which of the following processed would be affected most directly? a) NADPH oxidation. b) ATP synthesis. c) Flow of electrons from photosystem I to photosystem II.
- The products of cellular respiration are: a. glucose and ATP b. oxygen, carbon dioxide, and water c. NADPH and oxygen d. energy, carbon dioxide, and water
- During cellular respiration, sun energy stored in is converted to chemical energy. a. CO2 b. FAD+ c. NAD+ d. glucose e. ATP
- The general process of photosynthesis converts: a. CO2 into O2 b. glucose into CO2 c. CO2 into glucose d. glucose into H2O
- Electrons lost by Photosystem II are replaced directly by those from which of the following? a) Photosystem I b) the Electron Transport Chain c) Water d) NADPH e) ATP Synthase.
- What is a reaction of photosynthesis that requires light called? Light energy is absorbed and converted to chemical energy in the form of ATP and NADPH.
- The oxygen released in photosynthesis comes from : a. water. b. glucose. c. ribulose bisphosphate. d. carbon dioxide. e. atmospheric oxygen.
- Which of the following are inputs to the carbon reactions? a. Glucose and ATP b. Carbon dioxide and NADP+ c. Oxygen and water d. ATP and NADPH
- During photosynthesis, photons raise electrons to higher energy levels. These excited electrons belong to what compound? a. water b. ATP c. chlorophyll d. electron transport chain
- During photosynthesis, is oxidized, while is reduced. a. carbon dioxide; carbohydrate b. carbon dioxide; water c. carbon dioxide; oxygen d. water; carbon dioxide e. carbohydrate; carbon dioxide
- Photosynthesis and cellular respiration are very closely linked processes. Carbon dioxide and water, the what of photosynthesis, are the what of cellular respiration?
- The light reaction of photosynthesis occurs in the: a. thylakoid membranes b. stroma c. cytoplasm d. matrix
- Oxygen production during photosynthesis is through A) Reaction in photosystem II (PSII) B) Reaction in photosystem I (PSI) C) ATP synthase D) NADP+ reductase
- Energized electrons from the water-splitting photosystem pass down an electron transport chain to the _____-producing photosystem. a. NADP+ b. O2 c. NADPH d. H2O e. ATP
- In light-dependent reactions, what accumulates in the thylakoid compartment of chloroplasts? a. sugars b. hydrogen ions c. O2 d. CO2
- Explain what would happen if during photosynthesis H^+ was blocked from entering the thylakoid compartment as the electrons move along the first electron transfer chain.
- The oxygen released in photosynthesis comes from: a. carbon dioxide. b. glucose. c. ribulose bisphosphate. d. water. e. atmospheric oxygen.
- The electrons excited by the photons that contact Photosystem II a. are recycled into H_2O. b. leave the thylakoid at hydrolysis. c. combine with ATP. d. have to be re-energized at Photosystem I. e. are lost to water production.
- Select the correct answer. The ultimate acceptor of the electron passed along the electron transport chain in photosystem I is: a. water b. sugar c. carbon dioxide d. NADP+
- a. How does photosynthesis convert light energy into chemical energy? b. How are the chemical products of the light-trapping reactions coupled to the synthesis of sugars? c. What kind of photosynthesis adaptations has evolved in response to different en
- The molecule that absorbs sunlight for photosynthesis is: a. oxygen. b. carbon dioxide. c. chlorophyll. d. glucose. e. sunlight.
- During both photosynthesis and respiration ATP is produced: a. as a result of electron flow b. by substrate level phosphorylation c. by protons moving through ATPase d. by pmf e. all except b
- Which of these choices is a product of photosynthesis and a reactant of cellular respiration? a. Water b. Oxygen c. Carbon dioxide d. Energy
- NADPH is formed when: a. it accepts high-energy electrons from an excited photosystem b. 2 molecules of ATP combine c. it can transfer electrons to a free quinone molecule d. electrons are absorbed by an oxygen molecule e. ATP is converted to ADP plus a f
- The products of photosynthesis are: a. glucose and oxygen. b. carbon dioxide, chlorophyll, and oxygen. c. carbon dioxide, water, and energy. d. glucose and water. e. glucose and carbon dioxide.
- Photosynthesis is an _______ reaction. a. exergonic b. endergonic
- NADH is reoxidized by which of the following processes? A. Glycolysis. B. Fermentation. C. Krebs cycle. D. Electron transport chain. E. Light reactions to photosynthesis.
- Which of the following is not produced in the light-dependent reactions of photosynthesis? A. NADPH B. sugars C. ATP D. oxygen
- In the mitochondrial electron transport chain, electrons flow energetically downhill from NADH to oxygen and reduce it to water. In the chloroplasts' electron transport chains, electrons that come from the splitting of water flow energetically downhill an
- Describe how the processes of photosynthesis and respiration are linked based on the reactants and products (water, carbon dioxide, glucose, and oxygen) of both pathways.
- Photosynthesis is a redox reaction. One molecule is oxidized while one molecule is reduced. Which molecule is reduced during photosynthesis? a. Carbon dioxide b. Oxygen c. Water d. Glucose
- How are electrons supplied to the non-cyclical electron transport pathway? a. photosynthesis b. chemiosmosis c. glycolysis d. ATP synthesis e. photolysis
- How does the electron transport chain in cellular respiration differ from the electron transport chain in photosynthesis? a. In respiration water is formed from oxygen whereas in photosynthesis oxygen is formed from carbon dioxide. b. In respiration the e