BIOLOGY
5th Edition
ISBN: 9781264104680
Author: BROOKER
Publisher: MCG
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Chapter 8, Problem 4TY
Summary Introduction
Introduction: The photosynthesis is required by the plant to harvest the light energy from the sunlight and convert the atmospheric carbon dioxide into a usable form of carbohydrates. The carbohydrate synthesized by the plant is glucose that is stored in the form of starch.
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Which of the following descriptions about photosystems during linear electron flow is not correct?
Select one:
a. energy required for ATP synthesis is provided when electrons pass through the electron transport chain from photosystem I
b. photosystem II works before photosystem I
c. P680 is the chlorophyll a pair that exists in photosystemII
d. the primary electron acceptor receives electrons from P680 or P700
e. P680+ receives electrons from the splitting of water
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
Both the light reactions and light-independent reactions of photosynthesis…
Select one:
a. None of the options are true.
b. use NADPH.
c. fix CO2.
d. synthesize ATP.
e. rely on electron transport.
Chapter 8 Solutions
BIOLOGY
Ch. 8.1 - Core Skill: Modeling The goal of this modeling...Ch. 8.1 - Prob. 2CSCh. 8.1 - Can the Calvin cycle occur in the dark?Ch. 8.2 - Prob. 1CCCh. 8.2 - Prob. 2CCCh. 8.2 - Prob. 3CCCh. 8.2 - Prob. 4CCCh. 8.2 - Why does cyclic photophosphorylation provide an...Ch. 8.2 - Prob. 6CCCh. 8.3 - Prob. 1CC
Ch. 8.4 - Prob. 1CCCh. 8.4 - Prob. 1EQCh. 8.4 - Prob. 2EQCh. 8.4 - Prob. 3EQCh. 8.5 - Prob. 1CCCh. 8.5 - Prob. 2CCCh. 8 - The water necessary for photosynthesis a. is split...Ch. 8 - In PSII, P68o differs from the pigment molecules...Ch. 8 - Prob. 3TYCh. 8 - Prob. 4TYCh. 8 - Prob. 5TYCh. 8 - Prob. 6TYCh. 8 - Prob. 7TYCh. 8 - Prob. 8TYCh. 8 - Prob. 9TYCh. 8 - Prob. 10TYCh. 8 - Prob. 1CQCh. 8 - Prob. 2CQCh. 8 - Prob. 3CQCh. 8 - Discuss the advantages and disadvantages of being...Ch. 8 - Biotechnologists are trying to genetically modify...
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- 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.arrow_forwardWhich of the following processes during photosynthesis is incorrectly coupled to its typical location? Select one: a. Rubisco catalyzes carbon fixation—stroma b. ATP is produced via ATP synthase—thylakoid lumen c. NADPH is oxidized to NADP+—stroma d. Oxygen gas is produced by splitting of water—thylakoid lumen e. Activated P680 donates an electron to the primary electron acceptor—thylakoid membranesarrow_forwardMark ALL that are true for cyclic photophosphorylation. Select one or more: a. Requires Photosystem II but not Photosystem I. b. Electrons are recycled back to the original photosystem, and therefore water is not required as an electron donor. c. Generates O2 and ATP, but not NADPH. d. Enables electrons to bypass the electron transport chain between the two photosystems. e. It is coupled to proton transport into the stroma.arrow_forward
- During the light-dependent reactions the high energy electron from P680. Select one: a. moves to Photosystem I b. becomes incorporated into water molecules c. is used to fix carbon dioxide d. is pumped into the thylakoid space e. reduces FADarrow_forwardWhich of the following is true of chloroplastic ATP: Select one: a. it is made in the Calvin cycle and consumed in the light reactions b. it is used during photosynthesis, S assimilation, and N assimilation c. it does not leave the chloroplast, and is used to breakdown molecules d. it is made during photosynthesis and S assimilation e. it leaves the chloroplast, and is consumed in respiration and N assimilationarrow_forwardThis Z diagram of the light dependent reaction shows how an electron moves from the reaction center to Energy of electrons a. b. Photosystem II photosystem I. an electron acceptor. C. photosystem II. d. e. an electron carrier. NADP. complex 21-0 H 411 +0. Photosystem I NADP + H NADP reductase NADPHarrow_forward
- 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.arrow_forwardDirections: Arrange in sequence the process of electron flow in Photosystem I from first to last by writing 1-4 on the blank provided before each number.arrow_forwardWhich of the following statements is/are FALSE? a.NADPH is formed in the stroma. b.The cyclic electron transport involves PSII only. c.pH gradient can be formed from the splitting of H2O. d.In the pH gradient, stroma is acidic and thylakoid space is basic.arrow_forward
- Which of the following is true of light-independent reactions of photosynthesis? Select all that apply. a. Light-independent reactions occur in the stroma. b. Water molecules are split during light-independent reactions. c. Chlorophyll absorbs energy from sunlight. d. Carbon dioxide is necessary for light-independent reactions.arrow_forwardDirections: Arrange in sequence the process of electron flow in Photosystem II from first to last by writing 1-4 on the blank provided before each number.arrow_forwardWhich 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.arrow_forward
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