In the C3 pathway, if the concentration of CO2 becomes very low and O2 is high, RuBisCO starts acting as an:
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Correct answer: Oxygenase
RuBisCO has an affinity for both CO2 and O2. When O2 levels are high and CO2 levels are low, it functions as an oxygenase, leading to the process of photorespiration, which is wasteful for the plant.
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More Dark Reactions: Calvin Cycle and C3 Pathway questions
- Which of the following is utilized during the regeneration phase of the Calvin cycle?
- Melvin Calvin used which radioactive isotope to trace the path of carbon in algal photosynthesis?
- For the net export of one molecule of triose phosphate (G3P) from the Calvin cycle, how many turns of the cycle are needed?
- What is the primary reason the 'Reduction' phase is called so?
- Which of these is NOT a direct product of the Calvin cycle?
- If a C3 plant is provided with CO2 containing 14C, which molecule would show radioactivity first?