[Nebullis]

Somehow I find the concept unacceptable that bacteria know that when a human produced penicillin molecule hits them it is time to act.

I'm surprised. It sounds like something right up your alley, natural genetic engineering and all that. Cells which don't contain the plasmid will collect it under selective pressure. It's evolution, nonetheless.

[AndrewC]

I'm surprised. It sounds like something right up your alley, natural genetic engineering and all that.

I think you missed my point. I don't believe the Penicillium notatum is less than 100 years old.