Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 10.1, Problem 2R
Summary Introduction
To review:
The experimental evidence that water is the source of the oxygen (O2) produced during photosynthesis.
Introduction:
The process of photosynthesis includes carbon reduction. This process requires a hydrogen or electron donor for reducing the CO2 (carbon dioxide). In plants, water is the main source of hydrogen and acts as a hydrogen donor. Therefore, the reduction of CO2 involves hydrogen water and release of oxygen as a byproduct. This process is known as photolysis of water. This has proved experimentally by using heavy isotopes.
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Life: The Science of Biology
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- What is the overall purpose of the light reactions in photosynthesis?arrow_forwardMelvin Calvin and Andrew Benson determined the steps in the light-independent reactions of photosynthesis by exposing the green alga Chlorella to CO2 labeled with the radioisotope carbon 14. By looking at which compounds the C14 ended up in, they were able to identify all intermediates in this cyclic pathway. Why did they predict correctly that the same set of intermediates would be formed in the light reaction in land plants?arrow_forwardWhy is photorespiration considered an evolutionary artifact?arrow_forward
- What is the Similarities and Differences of C3 Photosynthesis and CAM Pathway in performing photosynthesis?arrow_forwardIs the primary goal of photosynthesis to make organic compounds such as glucose (C6H12O6), or is the goal to produce oxygen gas (O2) for aerobic organisms?arrow_forwardWhat are the processes of the photochemical stage of the photosynthesis process?arrow_forward
- What is the general chemical equation of photosynthesis? Why doesn't that equation clearly show the real origin of the molecular oxygen liberated?arrow_forwardhow the relationship between photosynthesis and cellular respiration prove that the Laws of Conservation of Mass and Energy exists in living systems?arrow_forwardwhy would photorespiration persist in the face of what must be strong evolutionary pressure to reduce or eliminate the unwanted reaction with oxygen?arrow_forward
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