When did meiosis get started? At first all eukaryote cells divided using a process called mitosis. But about 1.4 billion years ago, some eukaryote cells developed the ability to reproduce using meiosis instead. [...]
Lysosomes (under an electron microscope) When did lysosomes evolve? Prokaryote cells don't have lysosomes, so the first ones probably evolved about the same time as the other pieces of eukaryote [...]
Highly magnified view of a cell wall made of lipids When did the first lipids form? Around four billion years ago, some of the amino acid molecules that were on [...]
One cell of a plant (magnified 22,500 times) Thanks to Ohio State University A cell is the smallest living thing (unless you count viruses), and all bigger living things are [...]
Image of a Golgi body. Taken with an electron microscope at the University of Melbourne, Australia How does a cell make Golgi bodies? First the RNA of a eukaryote cell [...]
Cell waste: A cell with a vacuole Cell waste and vacuoles Soon after eukaryote cells began to make vacuoles to help them catch their food and store it, about 600 [...]
Eukaryotes (seen through a microscope) are full of chloroplasts When did eukaryotes evolve? Around two billion years ago, when all cells still lived in the ocean, a few of the [...]
Endoplasmic reticulum inside a cell What's it made of? The endoplasmic reticulum is made out of a lipid membrane, just like the cell membrane around the outside of a cell, [...]
A group of brightly colored sponges in the ocean For almost three billion years, the only living things on earth were one-celled creatures, either prokaryotes or eukaryotes. Even today, the [...]
Hydra evolution: a hydra budding new hydras Before the hydra For almost three billion years, the only living things on earth were one-celled creatures, either prokaryotes or eukaryotes. What's a prokaryote? And [...]
