Biochemistry
6th Edition
ISBN: 9781305577206
Author: Reginald H. Garrett, Charles M. Grisham
Publisher: Cengage Learning
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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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Figure 7.3. Processes of photosynthesis. The light reactions directly require
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electrons produced by the light reactions.
Some biologists refer to the two parts of photosynthesis as the light
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What would the world look like if oxygenic photosynthesis never evolved to what it became today? What does this mean for the processes within photosynthesis?
Must use words: H2S, Krebs Cycle, Glycolysis, Electron Transport Chain (ETC).
Oxygenic photosynthesis in eukaryotes (in the chloroplasts of green algae and green plants) consumeswhich of the following substrate molecules (to generate glucose, water, and oxygen product molecules)?A. C12H22O11 + H2OB. C6H12O6 + 6O2 + 6H2OC. 6CO2 + 12H2OD. C6H12O6 + C6H12O6E. 6CO2 + 12H2S
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 would the graph look like if you did the same exact experiment but measured carbon dioxide instead of oxygen? You can explain in words or draw a sketch. Don't worry about the numbers just show the trend (would carbon dioxide be increasing, decreasing or staying the same between 0 and 30 minutes and fomr 30-60 minutes?). - photosynthesis 6CO, + 6H,0 + energy → C,H;0, + 60; energy in aerobic respiration C.HO 60 - 6CO; + 6H;0 + energy energy out 02 level vs Time 19.7 19.65 25,203 étv Aa MacBook Air 80 DII DD F2 F3 F6 F7 F8 F9 F10 F11 & 4 5 6 7 8. E R Y D H. J K C V M * 00 B *3arrow_forwardWhy photosynthesis is considered as a process supporting all life on Earth?arrow_forwardPhotosystem 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)? C6H12O6 only C6H12O6, H2O, and CO2 only CO2 only H2O and C6H12O6 only H2O onlyarrow_forward
- 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_forwardPlant chloroplasts are able to generate which of the following inorganic product molecules during oxygenic photosynthesis? cell biology C6H12O6 CO CO2 O2 H2Sarrow_forwardDuring oxygenic photosynthesis in eukaryotes, which substrate molecules provide the oxygen atoms that end up in product glucose molecules? CO2 only H2O and C6H12O6 only H2O only C6H12O6 and O2 only O2 onlyarrow_forward
- Photosynthesis is the most important producer of molecular oxygen (02) on our planet. From which molecule do oxygen atoms liberated by photosynthesis come? From which other molecule could one suspect they have come? What are the destinations of those oxygen atoms?arrow_forwardWhat molecule is considered as a by-product of photosynthesis which is used by mammals to breathe? C6H12O6 CO2 H2O O2arrow_forwardFrom your understanding of the Calvin cycle, which of the following statements would be correct when 6 CO2 molecules are introduced into this cycle? Choose all that could apply O two G3P molecules would be removed from the cycle O 1 RUBP would be used O 18 ATP would be required O 3 ATP would be produced O 3 NAPDH would be requiredarrow_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_forwardThe process of photosynthesis can be modeled in various ways. For example, a chemical equation is one way to represent photosynthesis. 6CO, + 6H,0 ++ +→ 60, + C,H,,O,arrow_forward
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Photosynthesis & Respiration | Reactions | Chemistry | FuseSchool; Author: FuseSchool - Global Education;https://www.youtube.com/watch?v=3XIyweZg6Sw;License: Standard YouTube License, CC-BY