Nick Lane quotes:

This was difficult to prove as most hydrogenosomes have lost their entire genome, but it is now established with some certainty.1 In other words, whatever bacteria entered into a symbiotic relationship in the first eukaryotic cell, its descendents numbered among them both mitochondria and hydrogenosomes."

Buchner proposed that fermentation was carried out by biological catalysts that he named enzymes (from the Greek en zyme, meaning in yeast). He concluded that living cells are chemical factories, in which enzymes manufacture the various products."

The myosin in our own skeletal muscles is more closely related to the myosin driving the flight muscles of that irritating housefly buzzing around your head than it is to the myosin in the muscles of your own sphincters

Nothing is more conservative than a bacterium.