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16. The chemical reaction for photosynthesis is 6 CO2 + 12 H20 + light energy C6H1206 + 6 02 + 6 H20 If the input water is labeled with a radioactive isotope of oxygen, 180, then the oxygen gas released as the reaction proceeds is also labeled with 180. Which of the following is the most likely explanation? (A) During the light reactions of photosynthesis, water is split, the hydrogen atoms combine with the CO2, and oxygen gas is released. (B) During the light reactions of photosynthesis, water is split, removing electrons and protons, and oxygen gas is released. (C) During the Calvin cycle, water is split, regenerating NADPH from NADP+, and oxygen gas is released. (D) During the Calvin cycle, water is split, the hydrogen atoms are added to intermediates of sugar synthesis, and oxygen gas is released.

16. The chemical reaction for photosynthesis is 6 CO2 + 12 H20 + light energy C6H1206 + 6 02 + 6 H20 If the input water is labeled with a radioactive isotope of oxygen, 180, then the oxygen gas released as the reaction proceeds is also labeled with 180. Which of the following is the most likely explanation? (A) During the light reactions of photosynthesis, water is split, the hydrogen atoms combine with the CO2, and oxygen gas is released. (B) During the light reactions of photosynthesis, water is split, removing electrons and protons, and oxygen gas is released. (C) During the Calvin cycle, water is split, regenerating NADPH from NADP+, and oxygen gas is released. (D) During the Calvin cycle, water is split, the hydrogen atoms are added to intermediates of sugar synthesis, and oxygen gas is released.

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter18: Nuclear Chemistry
Section: Chapter Questions
Problem 81QRT
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16. The chemical reaction for photosynthesis is 6 CO2 + 12 H2O + light energy C6H1206 + 6 02 + 6 H20 If the input water is labeled with a radioactive isotope of oxygen, 180, then the oxygen gas released as the reaction proceeds is also labeled with 180. Which of the following is the most likely explanation? (A) During the light reactions of photosynthesis, water is split, the hydrogen atoms combine with the CO2, and oxygen gas is released. (B) During the light reactions of photosynthesis, water is split, removing electrons and protons, and oxygen gas is released. (C) During the Calvin cycle, water is split, regenerating NADPH from NADP+, and oxygen gas is released. (D) During the Calvin cycle, water is split, the hydrogen atoms are added to intermediates of sugar synthesis, and oxygen gas is released. 17. A culture of Spirogyra (an autotrophic alga) is maintained in a water solution containing dissolved carbon dioxide and a source of phosphates but lacking nitrogen compounds. A rescarcher determines the rates of synthesis of several organic compounds found in the Spirogyra before and after several weeks in the water solution. Which of the following graphs best illustrates a likely result of the experiment? (A) 14 O Before I After 12 10 Carbohydrates Proteins Lipids Nucleic Acids Orpanic Compounds (B) 14 12 10 O Before I After Carbohydrates Proteins Lipids Nucleic Acids Orpanic Compounds (C) 14 O Before 12 10 After Carbohydrates Proteins Lipids Nucleic Acids Organic Compounds (D) 14 O Before I After 12 10
Transcribed Image Text:16. The chemical reaction for photosynthesis is 6 CO2 + 12 H2O + light energy C6H1206 + 6 02 + 6 H20 If the input water is labeled with a radioactive isotope of oxygen, 180, then the oxygen gas released as the reaction proceeds is also labeled with 180. Which of the following is the most likely explanation? (A) During the light reactions of photosynthesis, water is split, the hydrogen atoms combine with the CO2, and oxygen gas is released. (B) During the light reactions of photosynthesis, water is split, removing electrons and protons, and oxygen gas is released. (C) During the Calvin cycle, water is split, regenerating NADPH from NADP+, and oxygen gas is released. (D) During the Calvin cycle, water is split, the hydrogen atoms are added to intermediates of sugar synthesis, and oxygen gas is released. 17. A culture of Spirogyra (an autotrophic alga) is maintained in a water solution containing dissolved carbon dioxide and a source of phosphates but lacking nitrogen compounds. A rescarcher determines the rates of synthesis of several organic compounds found in the Spirogyra before and after several weeks in the water solution. Which of the following graphs best illustrates a likely result of the experiment? (A) 14 O Before I After 12 10 Carbohydrates Proteins Lipids Nucleic Acids Orpanic Compounds (B) 14 12 10 O Before I After Carbohydrates Proteins Lipids Nucleic Acids Orpanic Compounds (C) 14 O Before 12 10 After Carbohydrates Proteins Lipids Nucleic Acids Organic Compounds (D) 14 O Before I After 12 10
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