What is a property of C4 plants, but not C3 plants?

A.	Initially fix carbon dioxide in mesophyll cells as 4-carbon long compounds. C4 plants have a distinct initial path for carbon dioxide fixation. C4 plants initially fix CO2 in mesophyll cells as 4-carbon compounds, and later release CO2 in bundle sheath cells. There is an additional ATP requirement for each carbon dioxide utilized in this pathway.
B.	Initially fix carbon dioxide in bundle sheath cells as 3-carbon long compounds.
C.	Initially fix carbon dioxide in mesophyll cells as 3-carbon long compounds.
D.	Initially fix carbon dioxide in budle sheath cells as 4-carbon long compounds.
E.	Special leaf anatomy adapted for cold and wet climates.

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The Biology Project
University of Arizona
Monday, September 30, 1996
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