Which one of the following elements is activator for both ribulose...

Which one of the following elements is activator for both ribulose bisphosphate, carboxylase oxygenase and phosphoenol pyruvate carboxylase in photosynthetic carbon fixation?

Options

A $\mathrm{Mg}^{2+}$
B $\mathrm{Zn}^{2+}$
C $\mathrm{Mn}^{2+}$
D $\mathrm{Cl}^{-}$ and $\mathrm{K}^{+}$

Correct answer

A. $\mathrm{Mg}^{2+}$

Step-by-step solution

In photosynthetic carbon fixation magnesium ion

\left(\mathrm{Mg}^{2+}\right)

is an activator for both ribulose bisphosphate carboxylase oxygenase and phosphoenol pyruvate carboxylase enzymes.

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