Regulation of phosphoenolpyruvate carboxylase (PEPCase) governs CO2 fixation in both C4 and CAM (crassulacean acid metabolism) plants. Which one or more of the following statements with respect to PEPCase activity is / are CORRECT?
a) PEPCase in C4 plants is inactivated by dephosphorylation during the day.
b) PEPCase in CAM plants is inactivated by dephosphorylation during the day.
c) PEPCase in C4 plants is inactivated by dephosphorylation at night.
d) PEPCase in CAM plants is inactivated by dephosphorylation at night.
1
A and C
2
B and C
3
A and D
4
B and D