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

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

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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