Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Textbook Question
Chapter 8, Problem 8RQ
Predict the end result if a chloroplast’s light-, independent enzymes developed a mutation that prevented them from activating in response to light
- GA3P accumulation
- ATP and NAD PH accumulation
- Water accumulation
- Carbon dioxide depletion
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ATP is produced when protons (H+) flow down the gradient through the H+ channel/ATP synthase in the thylakoid membrane. A researcher discovers a drug that slows down the passage of protons through the H+ channel/ATP synthase.
What is expected to happen if this drug is applied to the chloroplasts?
The pH in the chloroplast stroma will increase, and less ATP will be produced.
The pH in the chloroplast stroma will decrease, and less ATP will be produced.
The pH in the chloroplast stroma will increase, and more ATP will be produced.
The pH in the chloroplast stroma will decrease, and more ATP will be produced.
the rate of photosynthesis in plants decreases due to clogged stomata of the leaves
Diagram 41 The Light Reactions of Photosynthesis
STROMA
Poteyte
Potayate
mples
HAD
Light
HLARO ACE
(high ir
Carto
Thylakold
membrane
ATP
ynthase
STROMA
ow N concentration)
ADP
Diagram 4 shows a single thylakoid membrane taken from a chloroplast inside of a leaf cell. The events of
the light dependent cycle that take place along the thylakoid membrane are shown.
Identify an energy transfer that takes place n Diagram 4.
Light energy is directly transferred into the chemical bonds of sugar.
O Light energy is directly transferred into the chemical bonds of ATP
The energy of the bonds of water are transferred into the chemical bonds of ATP.
The energy from an excited electron is transferred into the chemical bonds of NADPH.
Chapter 8 Solutions
Biology 2e
Ch. 8 - Figure 8.6 On a hot, dry day, plants close their...Ch. 8 - Figure 8.16 What is the source of electrons for...Ch. 8 - Figure 8.18 Which of the following statements is...Ch. 8 - Which of the following components is nor used by...Ch. 8 - What two main products result from photosynthesis?...Ch. 8 - In which compartment of the plant cell do the...Ch. 8 - Which statement about thylakoids in eukaryotes is...Ch. 8 - Predict the end result if a chloroplast’s light-,...Ch. 8 - How are the NADPH and GA3P molecules made during...Ch. 8 - Which of the following structures is not a...
Ch. 8 - How many photons does it take to fully reduce, one...Ch. 8 - Which complex is not involved in the establishment...Ch. 8 - From which component of the light-dependent...Ch. 8 - Three of the same species of plant are each grown...Ch. 8 - Plants containing only chlorophyll b are exposed...Ch. 8 - Which molecule must enter the Calvin cycle...Ch. 8 - Which order of molecular conversions is correct...Ch. 8 - Where in eukaryotic cells does the Calvin cycle...Ch. 8 - Which statement correctly describes carbon...Ch. 8 - If four molecules of carbon dioxide enter the...Ch. 8 - What is the overall outcome of the light reactions...Ch. 8 - Why are carnivores, such as lions, dependent on...Ch. 8 - Why are energy carriers thought of as either...Ch. 8 - Describe how the grey wolf population would be...Ch. 8 - How does the closing of the stomata limit...Ch. 8 - Describe the pathway of electi on transfer from...Ch. 8 - What are the roles of ATP and NADPH in...Ch. 8 - How and why would the end products of...Ch. 8 - Why is the third stage of the Calvin cycle called...Ch. 8 - Which part of the light-independent reactions...Ch. 8 - Why does it take three turns of the Calvin cycle...Ch. 8 - Imagine a sealed terrarium containing a plant and...Ch. 8 - Compare the flow of energy with the flow of,...
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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
- 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 functionarrow_forwardPhotosynthesis 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_forwardWhat are the products of the light-dependent reactions of photosynthesis? Select all that apply. NADPH O2gas ATP Sugarsarrow_forward
- Which of the following scenarios happens during the light-dependent reaction of photosynthesis? Oxygen gas is produced in the thylakoid lumen by the oxidation of water by photosystem I. Ferrodoxin and NADP+ reductase participates in the reduction of NADP+ to NADPH. Carbon dioxide enters the plants via stomata. Rubisco attaches three molecules of ribulose bisphosphate (RuBP) to one molecule of carbon dioxide.arrow_forwardDuring the light reactions of photosynthesis, pigments within the thylakoids membranes absorb solar energy, split water, and releasearrow_forwardWhich stage of the light-dependent reactions of photosynthesis is linked to photosystem I? ATP synthase phosphorylates ADP, forming ATP in the stroma. Hydrogen ions in the thylakoid compartment follow their gradient and flow through ATP synthases. Electrons from the photosystem move through an electron transport chain to form NADPH. The photosystem pulls replacement electrons from water molecules breaking the molecules into oxygen atoms and hydrogen ions.arrow_forward
- If a mutation occurs such that photosystem II no longer functions as efficiently as it should, which of the answer choices would be most directly affected? the amount of O2 produced the rate at which NADPH is produced the rate at which protons are transported into the thylakoid the rate of ATP synthesis by ATP synthase in the chloroplastarrow_forwardConsider the relationship between temperature and photosynthesis. As temperatures increase,gases such as CO2 diffuse faster. As a result, plant leaves will lose CO2 at a faster rate thannormal. If the amount of light reaching the leaf and the amount of water available are adequate,predict how this loss of gas will affect photosynthesis in the leaf.arrow_forwardDuring a La nifia event, the temperature of the Pacific Ocean near Central America becomes cooler than normal. As a result, more clouds form, and this can block sunlight from reaching plants in Central America forests. A researcher studying the effects of La nifia measured the amount of carbon dioxide ( CO,) uptake by tropical plants under different light intensities.The data are shown in the graph. Predict how a la nifia event effects the rate of photosynthesis by plants in the tropical forests of Central America. Provide evidence from the graph to support your prediction. Enter your answer in the box provided.arrow_forward
- The purpose of the light-dependent reactions of photosynthesis is to - a split water to form oxygen b join glucose molecules to form starch c uses energy molecules like ATP d produce sugarsarrow_forwardDiagram 4: The Light Reactions of Photosynthesis STROMA (low H* concentration) Cytochrome complex Photosystem I Photosystem I Light NADP reductase 4H NADP + H NADPH THYLAKOID SPACE (high H* concentration) 4 H* Thylakoid membrane ATP synthase STROMA (low H concentration) ADP Diagram 4 shows a single thylakoid membrane taken from a chloroplast inside of a the light dependent cycle that take place along the thylakoid membrane In the Thylakoid space water is split into O 02 H* and electrons O H*, ATP and O2 O Photosystem II, electrons and oxygen O 02 and chlorophyllarrow_forwardWhat stages of the light-dependent reactions occur prior to the buildup of hydrogen ions in the thylakoid compartment? Select all that apply. Energy emitted by the electron transport chain triggered by PSII generates a hydrogen ion gradient across the thylakoid membrane. PSII pulls replacement electrons from water molecules, which then break apart into oxygen atoms and hydrogen ions. A photosystem II (PSII) absorbs light energy and releases an electron. Electrons released from PSII enter an electron transport chain in the thylakoid membrane. A flow of hydrogen ions causes ATP synthase to phosphorylate ATP.arrow_forward
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