5 Questions
What percentage of reactions by RuBisCO in photorespiration add oxygen to RuBP?
Approximately 25%
What is the direct cost incurred by photorespiration?
One ATP and one NAD(P)H
What is the primary cause of photorespiration in plant metabolism?
Oxygenation of RuBP by RuBisCO
What is the end product of the oxygenation reaction of RuBisCO in photorespiration?
Phosphoglycolate
What is the overall impact of photorespiration on photosynthetic output in C3 plants?
It potentially lowers photosynthetic output by 25%
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.
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.
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