All lessons
bacteria
2 free lessons tagged bacteria across Science. Each one is a short sequence of focused steps with narration and a five-question quiz at the end — take them in any order, no signup required.
Science
beginnerHow bacteria grow, and why counting them is hard
Bacterial growth is exponential, which makes the arithmetic simple and the intuition terrible. This lesson covers doubling time, the four phases of a culture, and the gap between the cells you can see down a microscope and the ones that will actually grow on a plate.
10 steps·~15 min
Science
beginnerThe bacterial cell: what makes it different
A bacterium and one of your cells are both alive and share almost no structure beyond that. This lesson walks the bacterial cell part by part, the wall, the loop of DNA, the smaller ribosome, and shows why each difference is exactly what an antibiotic aims at.
10 steps·~15 min