Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 8, Problem 2TY
In PSII, P68o differs from the pigment molecules of the light-harvesting complex in that it
- a. is a carotenoid.
- b. absorbs light energy and transfers that energy to other molecules via resonance energy transfer.
- c. transfers an excited electron to the primary electron acceptor.
- d. transfer an excited electron to O2.
- e. acts like ATP synthase to produce ATP
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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
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.
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.
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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- In ________, electrons that have been energized by light contribute their energy to add phosphate to ADP, producing ATP. (a) crassulacean acid metabolism (b) the Calvin cycle (c) photorespiration (d) C4 pathways (e) photophosphorylationarrow_forwardIf an enzyme in the Calvin cycle were knocked out, then a the light-dependent reactions would increase. b the light-dependent reactions would stop. c the light-dependent reactions would diminish. d the light-dependent reactions would be unaffected.arrow_forwardWhat is the difference between the cyclic and noncyclic pathways of photosynthesis? a The cyclic pathway uses electron transport. b The cyclic pathway is light-dependent. c The noncyclic pathway produces NAPDH. d The noncyclic pathway produces ATP.arrow_forward
- The main purpose of the light-independent reactions is to ________. a. convert solar energy to chemical energy b. convert solar energy to ATP for short-term energy use c. build carbohydrates for long-term energy storagearrow_forwardThrough light reductions, ADP is phosphorylated into ATP via chemiosmosis. What is this process called? a. Reduction b. Calvin Cycle c. Photophosphorylation d. Photosynthesisarrow_forward________ reactions of photosynthesis generate NADPH and ATP to carry solar energy. a. The light-independent b. The light-dependent c. Both the light-dependent and -independentarrow_forward
- How are the NADPH and G3P molecules made during photosynthesis similar? a. They are both end products of photosynthesis. b. They are both substrates for photosynthesis. c. They are both produced from carbon dioxide. d. They both store energy in chemical bonds.arrow_forwardA. The C4 plant performs photosynthesis more efficiently than the C3 when the CO2 concentration is 600ppm or less. Provide one reason why the rate of photosynthesis doesn’t change for the C4 plant when the CO2 concentration increases above 400 ppm. B. Discuss what is happening in the C3 plant when the CO2 levels are below 50 ppm. Provide one reason why this does NOT happen to the C4 plant.arrow_forwardYou performed an experiment on photosynthesis on Elodea, using bromothymol blue as an indicator forpH. Your two light conditions were red light and blue light. You found that in blue light, your solutionturned a nice cobalt blue, and in red light it turned green.a. What can you conclude about the efficiency of photosynthesis in Elodea regarding those twowavelengths?b. What would your conclusion be if your negative control (no Elodea in white light) turned greenalso?arrow_forward
- How is the difference made up in the Calvin cycle when more ATP is used than NADPH? A. The Calvin cycle occurs half as often as the light-dependent reaction B. The cyclic pathway creates more ATP C. Additional ATP is created from glucose D. Excess NADPH is reused in the light reactionarrow_forwardIn cyclic photophosphorylation, how are the reaction center electrons replaced? A) An electron is split off of water B) The same electron returns C) an electron is donated by an electron carrier D) An electron splits off of ATP E) The reaction center electrons are not replacedarrow_forwardThe elctrons lost from the reaction center photosytem 1 are replaced by electrons from? A) photosytem 2 B) CO2 C) H20 D) ATP Photophoshorylation during photosynthesis differs from oixdative phosphorylation during cellular respiration in that? A) energy is stored in the form of proton (H+) concentration difference B) The final electron acceptor is NADP+ and not oxygen C) It involves an electron transport chain D) Generation of ATP is driven by a flow or protons (H+) through ATP synthase In chloroplasts, ATP synthase? A) Is found in the stroma B) Catalyzes the Calvin cycle C) Helps produce the concentration of gradient of H+ D) Phosphorylates ADP to ATP Global warming due to the greenhouse effect may be? A) Moderate by photosynthesis, which removes carbon dioxide from the atmoshpere B) Reduced by the burning of fossil fuels, which removes oxygen from the atomosphere C) Of little concern, since it is part of normal cycle for the planet D) Made worse by photosynthesis, which adds carbon…arrow_forward
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