Answer:
silicon and carbon have tge same number of valence electrons !
The substrate of the citric acid cycle which can block respiration when it is present in excess is MALONATE. Malonate inhibits respiration by competing with succinate dehydrogenase for its acitve site. Malonate binds to the active site without reacting, thus competing with succinate. This disrupts the cellular respiration in the cell.
Long answer short- to reproduce cells.
Due to the cones in your eyes(OR else they're called the photo receptors together with Rods)
the name of it is called proton :)
