First True Bacteria

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By Michael Alan Prestwood

Sun 22 Feb 2026

Published 7 months ago.

Updated 4 months ago.

First True Bacteria

~3.7 Billion years ago (shortly after LUCA)

Peptidoglycan cell wall and Ester-linked lipids

LUCA likely had a very simple, leaky membrane or a rudimentary protein shell. Bacteria developed a cell wall made of peptidoglycan (a mesh of sugars and amino acids). This acts like a reinforced chain-link fence, allowing bacteria to survive in different water pressures without exploding.

The peptidoglycan wall of sugars and amino acids is exactly what penicillin attacks! If a cell has this specific wall, it’s a bacterium.

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Michael Alan Prestwood
Author & Natural Philosopher

Prestwood writes on science-first philosophy, with particular attention to the convergence of disciplines. Drawing on his TST Framework, his work emphasizes rational inquiry grounded in empirical observation while engaging questions at the edges of established knowledge. With TouchstoneTruth positioned as a living touchstone, this work aims to contribute reliable, evolving analysis in an emerging AI era where the credibility of information is increasingly contested.