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Questions and Answers
What are the names of the scientists credited with the discovery of C4 carbon fixation?
What are the names of the scientists credited with the discovery of C4 carbon fixation?
- Marshall Davidson Hatch and Charles Roger Slack (correct)
- Louis Pasteur and Robert Koch
- Barbara McClintock and Rita Levi-Montalcini
- Gregory Mendel and Charles Darwin
Which enzyme is the main carboxylating enzyme in C3 photosynthesis?
Which enzyme is the main carboxylating enzyme in C3 photosynthesis?
- Lipase
- ATP synthase
- RuBisCO (correct)
- Pectinase
What is the main advantage of C4 photosynthesis over C3 photosynthesis?
What is the main advantage of C4 photosynthesis over C3 photosynthesis?
- Increases photorespiration by isolating CO2 from RuBisCO
- Reduces photorespiration by concentrating CO2 around RuBisCO (correct)
- Promotes photorespiration by dispersing CO2 around RuBisCO
- Enhances oxygenation by isolating CO2 from RuBisCO
What is the main consequence of RuBisCO oxygenation in C3 photosynthesis?
What is the main consequence of RuBisCO oxygenation in C3 photosynthesis?
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What are the two partially isolated compartments in C4 leaves that enable RuBisCO to work effectively?
What are the two partially isolated compartments in C4 leaves that enable RuBisCO to work effectively?
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Study Notes
Discovery of C4 Carbon Fixation
- Scientists Robert H. McCarty and Andrew C. (C) Assis are credited with the discovery of C4 carbon fixation mechanisms.
Main Enzyme in C3 Photosynthesis
- RuBisCO (Ribulose-1,5-bisphosphate carboxylase/oxygenase) is the primary carboxylating enzyme in C3 photosynthesis.
Advantages of C4 Photosynthesis
- C4 photosynthesis offers a significant advantage in arid and high-temperature environments by minimizing photorespiration.
- Increased efficiency in carbon fixation allows better adaptation to conditions with lower carbon dioxide concentrations.
Consequence of RuBisCO Oxygenation in C3 Photosynthesis
- RuBisCO oxygenation leads to photorespiration, which can decrease the overall efficiency of photosynthesis by consuming energy and releasing fixed carbon dioxide.
Compartmentalization in C4 Leaves
- Leaves adapted for C4 photosynthesis contain two partially isolated compartments: mesophyll cells and bundle-sheath cells.
- This compartmentalization helps concentrate carbon dioxide around RuBisCO, enhancing its efficiency and reducing photorespiration.
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Description
Test your knowledge of C4 carbon fixation with this quiz. Learn about the process discovered by Hatch and Slack, its significance in plant photosynthesis, and its distinction from C3 carbon fixation.
