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Questions and Answers
What percentage of reactions by RuBisCO in photorespiration add oxygen to RuBP?
What percentage of reactions by RuBisCO in photorespiration add oxygen to RuBP?
- Approximately 75%
- Approximately 50%
- Approximately 25% (correct)
- Approximately 100%
What is the direct cost incurred by photorespiration?
What is the direct cost incurred by photorespiration?
- Two ATP and two NAD(P)H
- One ATP and one NAD(P)H (correct)
- Two ATP and one NAD(P)H
- One ATP and two NAD(P)H
What is the primary cause of photorespiration in plant metabolism?
What is the primary cause of photorespiration in plant metabolism?
- Exchange of metabolites between chloroplasts and mitochondria
- Detoxification of ammonia in leaf peroxisomes
- Oxygenation of RuBP by RuBisCO (correct)
- Carboxylation of RuBP by RuBisCO
What is the end product of the oxygenation reaction of RuBisCO in photorespiration?
What is the end product of the oxygenation reaction of RuBisCO in photorespiration?
What is the overall impact of photorespiration on photosynthetic output in C3 plants?
What is the overall impact of photorespiration on photosynthetic output in C3 plants?
Study Notes
Photorespiration
- 25% of reactions by RuBisCO in photorespiration add oxygen to RuBP.
Cost of Photorespiration
- The direct cost incurred by photorespiration is a loss of fixed CO2 and ATP.
Cause of Photorespiration
- The primary cause of photorespiration in plant metabolism is the oxygenase activity of RuBisCO.
Oxygenation Reaction
- The end product of the oxygenation reaction of RuBisCO in photorespiration is a 3-carbon molecule (3-PGA) and a 2-carbon molecule (glycolate).
Impact on Photosynthesis
- The overall impact of photorespiration on photosynthetic output in C3 plants is a reduction of up to 25% in photosynthetic yield.
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Description
Test your knowledge of plant metabolism with this quiz on photorespiration. Explore the process where RuBisCO oxygenates RuBP, impacting the efficiency of photosynthesis. Learn about the desired reaction of carboxylation and the key steps in the Calvin-Benson cycle.
