Campbell Biology: Concepts & Connections (9th Edition)
9th Edition
ISBN: 9780134296012
Author: Martha R. Taylor, Eric J. Simon, Jean L. Dickey, Kelly A. Hogan, Jane B. Reece
Publisher: PEARSON
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Chapter 7, Problem 5TYK
The reactions of the Calvin cycle are not directly dependent on light, but they usually do not occur at night. Why? (Explain your answer.)
a. It is often too cold at night for these reactions to take place.
b. Carbon dioxide concentrations decrease at night.
c. The Calvin cycle depends on products of the light reactions.
d. Plants usually close their stomata at night.
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Students have asked these similar questions
If 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.
Explain briefly why the following ideas are false.
a. Photosynthesis is the food-making process done by plants.
b The Calvin cycle was called the dark reactions because it can only take place in the absence of light.
c. Photosynthesis can only be powered by sunlight.
If 30 molecules of CO2 enter the Calvin Cycle,a. How many molecules of phosphoglycerate (PGA) will be produced?
b. How many molecules of glyceraldehyde phosphate (PGAL) leave the cycle?
c. How many molecules of ribulose bisphosphate (RuBP) will be produced?
d. How many molecules of ATP will be utilized?
Chapter 7 Solutions
Campbell Biology: Concepts & Connections (9th Edition)
Ch. 7 - Complete this summary map of photosynthesis.Ch. 7 - In photosynthesis, __________ is oxidized and...Ch. 7 - Which of the following are produced by reactions...Ch. 7 - When light strikes chlorophyll molecules in the...Ch. 7 - The reactions of the Calvin cycle are not directly...Ch. 7 - Which of the following does not occur during the...Ch. 7 - Why is it difficult for C3 plants to carry out...Ch. 7 - How is photosynthesis similar in C4 plants and CAM...Ch. 7 - To synthesize one glucose molecule, the Calvin...Ch. 7 - Compare and describe the roles of CO2 and H2O in...
Ch. 7 - Explain why a poison that inhibits an enzyme of...Ch. 7 - What do plants do with the sugar they produce in...Ch. 7 - Explain what is meant by saying the light...Ch. 7 - The following diagram compares the chemiosmotic...Ch. 7 - Continue your comparison of electron transport and...Ch. 7 - Prob. 16TYKCh. 7 - Most scientific experts agree that climate change...
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- Which of the following are the products of the light reactions of photosynthesis. A. Glucose B. Water C. ATP D.NADP E. Light energy F. NADPH G. Carbon dioxide H. Oxygenarrow_forwardAlthough the Calvin cycle does not depend on light, it generally does not occur during night. What is the reason for this? Select one: a. The Calvin cycle cannot proceed because the products of light reaction are insufficient. b. Enzymes do not function normally due to the low temperature. c. Carbon cannot be fixed because of the low concentration of carbon dioxide. d. Energy is not provided because the electron transport chain is used for respiration. e. Carbon dioxide is not available because the stomata is closed.arrow_forwardWhich of the following is a stage in the light independent reactions in photosynthesis (Calvin cycle) Group of answer choices a. release of oxygen b. photolysis of water c. photophosphorylation of ADP d. carboxylation of a 5-C sugararrow_forward
- a scientist takes the preparation after treatment with acetic acid and places the thylakoids in hexane, a strong, non -polar, organic solvent. what will occur? A. ATP will be made B. The Calvin cycle will begin C. Half as much NADPH will be made per cycle. D. The thylakoids will dissolve and be destroyed by the solvent.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_forwardWhich of the following are products of the dark (light independent, Calvin cycle) reactions of photosynthesis. A. Glucose B. Water C. ATP D. NADP E. Light energy F. NADPH G. Carbon dioxide H. Oxygenarrow_forward
- Compare the light reaction with the calvin cycle of phosynthesis in plants,which of the following requires NADPH? a. light reaction alone b. the calvin cycle alone c. both light reaction and calvin cycle d. neither the light nor the calvinarrow_forwardPhotosynthesis consists only of Calvin cycle Select one: a. False b. Truearrow_forwardA scientist takes the preparation after treatment with acetic acid and places the thylakoids in hexane, a strong, non-polar, organic solvent. What will occur? A. ATP will be made. B. The Calvin cycle will begin. C. Half as much NADPH will be made per cycle. D. The thylakoids will dissolve and be destroyed by the solvent.arrow_forward
- Compare the light reaction with the calvin cycle of phosynthesis in plants,which of the following requires three carbon sugars? a. light reaction alone b. both light and calvin cycle c. the calvin cycle alone d.neither the light nor the calvinarrow_forwardPhoto-oxidation is: A. photorespiration B. photolysis C. light and oxygen induced breakdown D. All of the abovearrow_forwardRibulose bisphosphate carboxylase, which might be the most abundant enzyme on Earth, is part of which photosynthetic reaction? A. the Hill reaction B. the light-independent reaction C. photosystem II D. the light-dependent reaction E. photosystem Iarrow_forward
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