Assuming that that rate of carbon dioxide uptake is the rate-limiting step in photosynthetic growth, which algal species will grow faster if the concentration of carbon dioxide is: 5 mM? 100 mM? 2000 mM?
Two algal species utilize different transport proteins to take up carbon dioxide for use in photosynthesis. The kinetics of carbon dioxide uptake by the transport proteins in species A and B are different:
Species A Species B
Km 1000 mM 10 mM
Vmax 1000 mmol/min 100 mmol/min
Answer: Students can calculate the v at each carbon dioxide concentration for both algal species. Some students may also be able to logically deduce which species will grow faster at low and high carbon dioxide concentrations based on the very different kinetic characteristics. Species B will grow faster (uptake carbon dioxide faster) at 5 mM, the two species have an equal rates of carbon dioxide uptake at 100 mM, and species A will grow faster at 2000 mM.
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