BIOLOGY
4th Edition
ISBN: 9781266739606
Author: Hoefnagels
Publisher: MCG
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Chapter 5, Problem 12WIO
Explain why each of the following misconceptions about photosynthesis is false: (a) Only plants are autotrophs. (b) Plants do not need
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From a plant's perspective, the main purpose of photosynthesis is to
Group of answer choices
a)to produce sugars and oxygen for heterotrophs.
b)plants are not cognitive organisms and therefore we have no idea what the "purpose" of photosynthesis is for the plant.
c)to produce enough O2 gas for the plant to survive through the night.
d)make sugars, such as glucose, to use for building cell walls and for energy needed by the plant.
In the diagram of photosynthesis shown here, fill in each blank with the appropriate term: (a) Sunlight; (b) CO2; (c) Oxygen; (d) H2O; (e) ATP and NADPH; (f) ADP and NADP+; (g) Sugar; (h) Light reactions; (i) Calvin cycle.
The Calvin cycle, the "dark reaction" or Carbon fixation reactions of photosynthesis, cannot occur at night in a living plant. Which of the following best describes why this is true?
A) The stomata are incapable of opening at night, thus CO2 cannot enter the leaf
B) The reactions of the Calvin cycle are dependent on light reactions for high-energy compounds
C) Several enxymes necessary for Calvin cycle activity have been degraded during the day and must be replaced
D) Light is required to transport the water necessary for the cycle
E) Cooler temperatures at night slow enzyme activity and rates of substrate diffusion
Chapter 5 Solutions
BIOLOGY
Ch. 5.1 - What is photosynthesis? Describe the reactants and...Ch. 5.1 - Prob. 2MCCh. 5.1 - Prob. 3MCCh. 5.1 - Prob. 4MCCh. 5.1 - How did the origin of photosynthesis alter Earths...Ch. 5.2 - Prob. 1MCCh. 5.2 - Prob. 2MCCh. 5.2 - Prob. 3MCCh. 5.2 - How does the reaction center chlorophyll interact...Ch. 5.3 - Prob. 1MC
Ch. 5.3 - Prob. 2MCCh. 5.4 - Prob. 1MCCh. 5.4 - Prob. 2MCCh. 5.4 - Prob. 3MCCh. 5.4 - Prob. 4MCCh. 5.5 - What is the relationship between the light...Ch. 5.5 - Prob. 2MCCh. 5.6 - Why is the Calvin cycle also called the C3...Ch. 5.6 - Prob. 2MCCh. 5.6 - What conditions maximize photorespiration?Ch. 5.6 - Prob. 4MCCh. 5.6 - How is the CAM pathway similar to C4 metabolism,...Ch. 5.7 - Prob. 1MCCh. 5.7 - Prob. 2MCCh. 5 - Where does the energy come from to drive...Ch. 5 - Prob. 2MCQCh. 5 - Prob. 3MCQCh. 5 - The evolution of photosynthesis resulted in a. an...Ch. 5 - Prob. 5MCQCh. 5 - Prob. 6MCQCh. 5 - Prob. 7MCQCh. 5 - A plant that opens its stomata only at night is a...Ch. 5 - Imagine that multiple simultaneous volcanic...Ch. 5 - Prob. 2WIOCh. 5 - Prob. 3WIOCh. 5 - Would a plant grow belier in a room painted blue...Ch. 5 - Determine whether each of the following molecules...Ch. 5 - Of the many groups of photosynthetic bacteria,...Ch. 5 - Prob. 7WIOCh. 5 - Over the past decades, the CO2 concentration in...Ch. 5 - How does photosynthesis help compensate for...Ch. 5 - How is the CAM pathway adaptive in a desert...Ch. 5 - Explain how C4 photosynthesis is based on a...Ch. 5 - Explain why each of the following misconceptions...Ch. 5 - Prob. 1PITCh. 5 - 2. How would you incorporate the Calvin cycle,...Ch. 5 - Prob. 3PITCh. 5 - Prob. 4PITCh. 5 - Prob. 5PIT
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- Carbon dioxide is required for which of the following processes in photosynthesis? a) the Calvin cycle b) the splitting of water c) the absorption of water d) the production of ATP e) the light reactionarrow_forwardExplain why each of the following misconceptions about photosynthesis is false: a. Only plants are autotrophs. b. Plants do not need cellular respiration because they carry out photosynthesis. c. Chlorophyll is the only plant pigment.arrow_forwardWhen discussing why the rate of photosynthesis did not increase at higher light intensities, the investigator mentioned the possibility that high light intensities could damage chlorophyll, which would result in a decrease in oxygen production. Which of the following accurately explains the role of chlorophyll in oxygen production during photosynthesis and why damage to chlorophyll would results in lower oxygen production? Select one or more: a. Chlorophyll participates in carbon fixation during the Calvin Cycle. During this process, oxygen molecules are formed. b. Chlorophyll captures energy from sunlight and releases high energy electrons that enter the electron transport chain in the Calvin Cycle. During this process, oxygen molecules are formed. c. Chlorophyll participates in carbon fixation during the light reactions. During this process, oxygen molecules are formed. d. Chlorophyll captures energy from sunlight and releases high energy electrons that enter the electron…arrow_forward
- If ribulose bisphosphate were removed from a chloroplast, which of the following statements would BEST describe the immediate result? b)ATP could not be produced in the thylakoid a) CO2 could not enter the Calvin cycle d) Light energy could not be trapped in the grana c) 02 could not enter the Calvin Cyclearrow_forwardSuppose we set up a system in a lab where plants are automatically injected with all the glucose they need to survive. What part of photosynthesis would the plants no longer need to perform? Group of answer choices a)ETC 1 b)the entire dark reaction c)the entire light reaction d)P700 e)all of itarrow_forwardThere is a constant flow of energy between the processes of photosynthesis and cellular respiration. Photosynthesis produces a small amount of ATP energy which is used in cellular respiration to produce more ATP molecules for use in cellular functions. Place the following statements in order (some have been done for you) to summarize how the two processes work together to produce usable energy for all living organisms. 1. Light energy is absorbed by the thylakoid membranes in chloroplasts. 2. 3. 4. PGAL is used to make glucose molecules (energy storage). 5. 6. 7. 8. 9. NADH from the Krebs cycle and O2 from the light reactions of photosynthesis are used in the electron transport chain to create a proton gradient across the inner membrane of the mitochondria. 10. 11. Energy from ATP and NADPH is used to fix CO2 and form PGAL (Calvin-Benson cycle) Pyruvate is broken down into CO2 and acetyl CoA in the matrix Krebs cycle makes NADH molecules The absorbed energy is used to make ATP and…arrow_forward
- Which of the following terms regarding the Calvin cycle are mismatched? a.) rubisco and ATP production b.) PGAL and rearranged from glucose c.) carbon fixation and stromaarrow_forwardWhich of the following best describes the products of the photochemical reactions of photosynthesis?A) NADH and ATP are made in the stromaB) NADPH and ATP are made in the stromaC) NADH and ATP are made in the thylakoid lumenD) NADPH is made in the stroma and ATP is made in the thylakoid lumenE) NADPH and ATP are made in the thylakoid lumenarrow_forwardThe energy of sunlight is captured and used to energize electrons, which are then stored in the covalent bonds of sugar molecules. This describes a). Carbon fixation b). Reduction c). The Calvin Cycle d). Photosystems II and I e). Photosynthesisarrow_forward
- Since carotenoids are part of the _________, their electrons are not passed on when they get excited. A) electron carriers of the photosystem B) electron transport chain C) antenna complex of the photosystem D) reaction center of the photosystemarrow_forwardWhich of the following sequences correctly represents the flow of electrons during photosynthesis? A) NADPH →→02→CO₂ B) H₂O NADPH → Calvin cycle C) NADPH →chlorophyll → Calvin cycle D) H₂O → photosystem I → photosystem II E) NADPH electron transport chain → 02 Place these events in the correct order: absorption of electromagnetic radiation by chlorophyll, synthesis of sugars, utilization of carbon dioxide by Calvin cycle enzymes, synthesis of NADPH, synthesis of ATP, conversion of water into molecular oxygen. Is NADP+ oxidized or reduced during the light reactions? How do you know this? What would you expect to happen if you inactivated the NADP+ reductase?arrow_forwardPhotosynthesis is important to living organisms because it is the number one source of oxygen in the atmosphere. Green plants and trees use photosynthesis to make food from sunlight, carbon dioxide and water in the atmosphere: It is their primary source of energy. By recognizing concepts learned on this module, answer the following questions briefly: a. How important is light energy in the absorption and conversion of chlorophyll. b. Describe the role of the proton+ gradient used to make energy currencies such as ATP.arrow_forward
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