BIOLOGY 2E
2nd Edition
ISBN: 9781506699851
Author: OpenStax
Publisher: XANEDU PUBLISHING
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Textbook Question
Chapter 8, Problem 9RQ
How are the NADPH and GA3P molecules made during photosynthesis similar?
- They are both end products of photosynthesis
- They are both substrates for photosynthesis
- They are both produced from carbon dioxide
- They both store energy in
chemical bonds.
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Which of the following statements about photosynthesis is NOT true?
Light independent reactions are very similar to the electron transport chain of cellular respiration
Light is absolutely essential for both aspects of photosynthesis
In order replace electrons, water is split to form oxygen gas
Light dependent reactions are very similar, but in reverse, to the Krebs cycle and glycolysis
The figure shows the absorption spectrum for chlorophyll a and the action spectrum for photosynthesis. Why are they
different?
400
500
600
700
Wavelength of light (nm)
O Green and yellow wavelengths inhibit the absorption of red and blue wavelengths.
O Oxygen given off during photosynthesis interferes with the absorption of light.
O Other pigments absorb light in addition to chlorophyll a.
Absorbance of chlorophyll a
Violet
Blue
Green
Yellow
Orange
Red
- Rate of photosynthesis
Which of the following accepts an electron from water in photosynthesis?
P680 in Photosystem II
O P700 in Photosystem I
Oxygen in Photosystem II
O NADP* in Photosystem I
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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- The Overall Free Energy Change for Photosynthetic NADP+ Reduction What is the overall free energy change (G) for noncyclic photosynthetic electron transport? 4 (700-nm photons) + 4 (680-nm photons) + 2 H2O + 2 NADP+O2 + 2 NADPH + 2H+arrow_forwardWhich of the following substances does not participate in the Calvin-Benson cycle? a. ATP c. NADPH e. PGAL b. O2 d. RuBP f. CO2arrow_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_forward
- Figure 8.16 What is the source of electrons for the chloroplast electron transport chain? Water Oxygen Carbon dioxide NADPHarrow_forwardWhich of the following is produced during the light reactions of photosynthesis? C6H12O6 CO2 O2 ADParrow_forwardWhat process is shown in the figure below? 3 Molecules CO2 RuBisCO Stage 1: carbon fixation 3 ADP 6 ATP ЗАТР 6 ADP Stage 3: regeneration of RUBP Stage 2: reduction 6 NADPH - 6 NADP*+ H* Sugar O Glycolysis O Light reactions of photosynthesis Oxidative phosphorylation Citric Acid Cycle O Dark reactions of photosynthesisarrow_forward
- Plant chloroplasts are able to generate which of the following inorganic product molecules during oxygenic photosynthesis? C6H12O6 CO CO2 O2 H2Sarrow_forwardWhich of the following reactions produces the oxygen released by photosynthesis? chemiosmosis reduction of NADP+ splitting of water molecules electron transfer in photosystem Iarrow_forwardWhat is the overall outcome of the light reactions in photosynthesis? NADPH and ATP molecules are produced during the light reactions and are used to power the light independent reactions. NADPH and ATP molecules are produced during the light reactions, which are used to power the light dependent reactions. Sugar and ATP are produced during the light reactions, which are used to power the light independent reactions. Carbon dioxide and NADPH are produced during the light reactions, which are used to power the light dependent reactions.arrow_forward
- Photosynthesis is a complex process. Two main stages of photosynthesis are: H20 co 1 Light dependent reactions This step converts light energy to chemical energy. Light NADP 2 Calvin Cycle Also known as the light independent reaction. In this stage, CO2 is taken up by one of the molecules in the cycle. ATP and NADPH reduce CO2 to a carbohydrate (G3P). ADP LIGHT CALVIN REACTIONS CYCLE Thylakoid Stroma NADPH 1. Inside of the chloroplast, chlorophyll molecules absorb light and convert light energy to chemical energy. In what stage of photosynthesis is chlorophyll needed? Why? Chloroplast (CH20] (sugar) 6 CO2 + 12 H20 + light energy → CeH12O6 + 6 O2 + 6 H20 carbon dioxide + water + light energy > glucose + oxygen + water 3. What are the inputs/ reactants for Calvin cycle? 2. What are the two outputs/ products of light dependent reactions?arrow_forwardWhere do photosynthetic organisms get the energy needed to make sugars during the light- independent/dark reactions? They use the ATP and NADPH that are produced during the light-dependent reactions. They convert the 6-carbon sugars into 5-carbon sugars. They obtain the energy directly from the Sun. They use the ADP and carbon dioxide produced during the light-dependent reactions.arrow_forwardWhich of the following is not produced during the light reactions of photosynthesis? H2O NADPH O2 ATParrow_forward
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