Which element is essential for the middle lamella?

Which of the following is a major component of thiamine,biotin,coenzyme $A$,and ferredoxin?

Mark the statements as true/false by choosing the correct option from the set $(I-IV)$ given below:
$I.$ Magnesium is a constituent of chlorophyll and helps to maintain the ribosome structure.
$II.$ Calcium is needed during the formation of mitotic spindle.
$III.$ Magnesium is essential for the photolysis of water.
$IV.$ Zinc helps in sugar translocation.

....... is present in nitrogenase and nitrate reductase,both of which participate in nitrogen metabolism.

Calcium can affect:

The permeability of the cell membrane is determined by which mineral element?