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Biochemistry
6th Edition
ISBN: 9781305577206
Author: Reginald H. Garrett, Charles M. Grisham
Publisher: Cengage Learning
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Textbook Question
Chapter 21, Problem 14P
The Source of the Oxygen Atoms in Photosynthetic O2 Evolution
The overall equation for photosynthetic CO2 fixation is 6CO2 + 6H2O
Atoms, yet there are only 6 O atoms in C6H12O6. How can you account for these discrepancies? (Hint: Consider the partial reactions of photosynthesis: ATP synthesis, NADP reduction, photolysis of water, and the overall reaction for hexose synthesis in the Calvin-Benson cycle)
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Photosystem II uses sunlight to strip electrons (and protons) away from which of the following substrate molecules (in the chloroplasts of green plants and green algae)?
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Chapter 21 Solutions
Biochemistry
Ch. 21 - P700* Has the Most Negative Standard Reduction...Ch. 21 - Prob. 2PCh. 21 - Prob. 3PCh. 21 - Prob. 4PCh. 21 - The Relative Efficiency of ATP Synthesis in...Ch. 21 - pH and in the Chloroplast Proton-Motive Force...Ch. 21 - Prob. 7PCh. 21 - Prob. 8PCh. 21 - Prob. 9PCh. 21 - Prob. 10P
Ch. 21 - Tracing the Fate of CO2 During Photosynthesis...Ch. 21 - Prob. 12PCh. 21 - Prob. 13PCh. 21 - The Source of the Oxygen Atoms in Photosynthetic...Ch. 21 - Prob. 15PCh. 21 - Prob. 16PCh. 21 - Prob. 17PCh. 21 - The Overall Free Energy Change for Photosynthetic...Ch. 21 - Prob. 19PCh. 21 - Prob. 20PCh. 21 - Prob. 21P
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biochemistry and related others by exploring similar questions and additional content below.Similar questions
- What 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_forwardHow would your understanding be different if the experiment had only looked at the overall results on the light reactions, instead of looking at how salinity affected each photosystem?arrow_forwardFigure 8.18 Which of the following statements is true? In photosynthesis, oxygen, carbon dioxide, ATP, and NADPH are reactants. G3P and water are products. In photosynthesis, chlorophyll, water, and carbon dioxide are reactants. G3P and oxygen are products. In photosynthesis, water, carbon dioxide, ATP, and NADPH are reactants. RuBP and oxygen are products. In photosynthesis, water and carbon dioxide are reactants. G3P and oxygen are products.arrow_forward
- 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_forwardPlants containing only chlorophyll b are exposed to radiation with the following wavelengths: 10nm (x- rays), 450nm (blue light), 670nm (red light), and 800nm (infrared light). Which plants harness the most energy for photosynthesis? X-ray irradiated plants Blue light irradiated plants Red light irradiated plants Infrared irradiated plantsarrow_forwardProvide the balanced chemical reaction for cellular respiration.arrow_forward
- Why are the rates of photosynthesis and cellular respiration dependent upon temperature?arrow_forwardThe citric acid cycle occurs outside the mitochondria. Group of answer choices True False From a plant's perspective, the main purpose of photosynthesis is to Group of answer choices to produce sugars and oxygen for heterotrophs. plants are not cognitive organisms and therefore we have no idea what the "purpose" of photosynthesis is for the plant. to produce enough O2 gas for the plant to survive through the night. make sugars, such as glucose, to use for building cell walls and for energy needed by the plant. The main purpose of the light reactions in photosynthesis is Group of answer choices to take the high energy electrons out of glucose. to generate ATP and NADPH to send to the Calvin Cycle. to produce all the ATP the plant cell needs for its cellular work. to produce enough oxygen gas for humans to survive. The actual process of making sugar in photosynthesis occurs during the Calvin cycle. Group of answer choices True…arrow_forward15arrow_forward
- Diagram 6: The Calvin Cycle Note: The circles near the chemical names represent carbon atoms. "RUBISCO' RUBP Carboxylase 3 CO2 1. Carbon dioxide is reduced 60000 3 3-phosphoglycera a 3C RUBP 6. CALVIN CYCLE 3. RUBP is regenerated from G3P. 2.3-Phospho- glycerate is reduced to G3P 3 ADP reverse re of glyca 3 ATP 6 N 6 N 5 G3P G3P 1 G3P Glucose (six carbons) Identify the part of the chloroplast in which the Calvin cycle takes place. outer chloroplast membrane inner thylakoid space stroma thylakoid membrane.arrow_forwardFill out this Venn diagram with the similarities and differences of photosynthesis and cellular respiration. OWN WORDS pls thank you and have a great day!!arrow_forwardEarth's atmosphere is about 21 percent oxygen. This percentage has remained about the same throughout human history and even earlier. How have cellular respiration and photosynthesis helped maintain relatively constant 1. oxygen levels? Cellular respiration helps maintain oxygen levels, while photosynthesis has no effect. Photosynthesis helps maintain oxygen levels, while cellular respiration has no effect. С. A. В. Cellular respiration removes oxygen from the atmosphere, while photosynthesis adds oxygen to the atmosphere. Photosynthesis removes oxygen from the atmosphere, while cellular respiration adds oxygen to the D. atmosphere.arrow_forward
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