Biological Science (7th Edition)
7th Edition
ISBN: 9780134678320
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 10, Problem 5TYU
Why is the chlorophyll in chloroplasts less likely to produce fluorescence compared to extracted chlorophyll molecules?
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1) When a leaf on an oak tree absorbs 15,440 photons, how many glyceraldehyde-3-phosphate molecules can be produced by the Calvin cycle?
b)When a leaf on an oak tree absorbs 15,440 photons, how many glyceraldehyde-3-phosphate molecules can be produced by the Calvin cycle?
Which of the following correctly sequences the steps of non-cyclic electron transport?
a) Chlorophyll molecules absorb UV radiation exciting electrons which flow through photosystem I, returning to the chlorophyll molecules
b) Electrons donated from water molecules pass through photosystem I then photosystem II before returning to the chlorophyll molecules, generating ATP in the process
c) Water is oxidized by the capture of light energy; these excited electrons are passed through the dark reactions, returning to chlorophyll during the final light reactions
d) The ATP and NADPH generated by the reactions of photosystem II and photosystem I are utilized by the Calvin Cycle to build high energy glucose molecules
In chloroplasts, the light reactions power the creation of ATP via chemiosmosis. In relation to this process, which of the following is true?
a) ATP synthase breaks ATP down into ADP, creating energy to fuel chemiosmosis.
b) Oxygen is used as a source of electrons to replace those lost in photosystem II.
c) Chemiosmosis during the light reactions is also used in the reduction of NADPH and FADH2.
d) As excited electrons fall back down to a lower energy state, they create a proton gradient that is used to fuel the phosphorylation of ADP.
Chapter 10 Solutions
Biological Science (7th Edition)
Ch. 10 - Why is chlorophyll green? a. It absorbs all...Ch. 10 - At what point in photosynthesis is the...Ch. 10 - 5. Why is the chlorophyll in chloroplasts less...Ch. 10 - Describe the three phases of the Calvin cycle and...Ch. 10 - Predict how the following conditions would affect...Ch. 10 - Prob. 10TYPSSCh. 10 -
Can green algae replace “black gold”?
Over the...Ch. 10 - Prob. 12PIATCh. 10 - One of the contributing factors to environmental...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Which of the following is in the correct order from smallest to largest? Thylakoid disk, Photosystem I, mesophyll cell, chloroplast, leaf Photosystem II, Chloroplast, thylakoid disk, mesophyll cell, leaf Thylakoid disk, Photosystem II, chloroplast, mesophyll cell, leaf Photosystem II, Thylakoid disk, chloroplast, mesophyll cell, leafarrow_forwardAtrazine is one of the world’s most used herbicides. It functions by bonding to and disabling a protein in photosystem II. Plants treated with this herbicide die via starvation. Based on this information, what is also true about atrazine-treated plants? a) Only non-cyclic electron flow is possible. b) There is not enough ATP created to fuel the Calvin cycle. c) The plants can switch to C4 pathways. d) The chloroplast is disabled.arrow_forwardWhat is so special about thylakoid membranes (and chloroplasts in general) that allow it to be the site for photosynthetic activity in plants?arrow_forward
- What is the advantage of having an extensive set of thylakoid membranes in the chloroplasts?arrow_forwardPhotosystems are essential to the light reactions. Which of the following is true about photosystems? a) Photosystems are embedded within membranes, across which they create a proton gradient. b) Photosystems work together to absorb light over a larger surface area than could be possible from just one pigment molecule working alone. c) Photosystems are composed of proteins and pigment molecules. d) All of the abovearrow_forwardIn what part of chloroplasts do the coupled redox reactions occur? stroma membrane thylakoid membrane intermembrane space thylakoid lumen stromaarrow_forward
- Chlorophyll a and chlorophyll b both play roles in photosynthesis. Using no more than one sentence to respond for each segment, please: 1) Outline the roles/functions that chlorophyll b play that are different from those for chlorophyll a 2) Outline the roles/functions that chlorophyll a play that are different from those for chlorophyll barrow_forwardDRAW a curved arrow mechanism for photosynthesis with the following steps. Step 1: Absorption of sunlight and excitation of chlorophyll molecules Step 2: Transfer of energy to reaction center chlorophylls, which lose an electron and become oxidized. Step 3: Electron transfer from oxidized chlorophylls to an electron acceptor, such as a quinone molecule Step 4: Electron transfer from the quinone molecule to a chain of electron carriers, such as cytochromes, which generate a proton gradient across the thylakoid membrane Step 5: ATP synthesis by ATP synthase using the energy of the proton gradient. Step 6: Transfer of electrons from the electron carriers to the enzyme rubisco, which catalyzes the carboxylation of ribulose bisphosphate (RuBP) with CO2, forming an unstable 6-carbon intermediate. Step 7: Cleavage of the 6-carbon intermediate into two 3-carbon molecules, which are phosphorylated by ATP and reduced by NADPH to form glyceraldehyde-3-phosphate (G3P) Step 8: Conversion of G3P to…arrow_forwardWhat are the two places where light energy is required in the light reaction of photosynthesis? Why must energy be supplied at precisely these points?arrow_forward
- Without carbon dioxide, chlorophyll fluoresces. How doescarbon dioxide prevent this fluorescence?arrow_forwardWhat part of the chloroplast contains chlorophyll?arrow_forward1) Dichlorophenyldimethylurea inhibits photosynthesis by blocking electron transfer between the plastoquinone in photosystem II. a) Would you expect this to interfere with cyclic photophosphorylation? b) This herbicide normally stops O2 evolution, but if we add ferricyanide to the chloroplasts, O2 evolution continues. Why might this be the case?arrow_forward
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