How to Make Our Friends at the Bottom

I know not their design,
Nor of their dividends,
Only how to frankenstein
Our very little friends.

The mushroom, she is Fungi --
Just one limb to keep her hold
(Any counter feet are bogi);
Cast her with a Mould.

The Amoeba has no vertex;
You may append an amoebum.
When pressed into servex,
He would sway it to and from.

There be no complex tricks
To beget a Bacterium,
Distance from antibiotics
The sole criterium.

Ration the creature Viral --
'Tis Death's loaded die.
Grant it the double spiral,
And slip it into a mie.