Question
Which one of the following elements is an activator for both ribulose biphosphate, carboxylase oxygenase and phosphoenol-pyruvate carboxylase in photosynthetic carbon fixation?
Mg2+
Zn2+
Mn2+
Cl− and K+
Solution
A.
Mg2+
In photosynthetic carbon fixation magnesium ion (Mg) is an activator for both ribulose bisphosphate carboxylase oxygenase and phosphoenol-pyruvate carboxylase enzymes.
