2 articles
How a self-assembling lipid bilayer becomes a selectively permeable barrier, why diffusion and osmosis move solutes for free while pumps spend ATP to push them uphill, and how those hard-won gradients power the rest of physiology.
The cell cycle from G1 through the M phase, mitosis stage by stage, the checkpoints that stop a cell from dividing at the wrong time, and how their failure becomes cancer.