A prokaryote (seen through a microscope) What does "prokaryote" mean? The simplest living cells are called prokaryotes, which is Greek for "before the nucleus" - these are cells that were [...]
An onion skin cell (seen through a microscope) You can see the nucleus inside each cell The earliest cells, and all prokaryote cells, don't have a nucleus. Inside these simple [...]
A eukaryote cell (seen through a microscope) full of chloroplasts How do eukaryotes divide? Eukaryote cells generally reproduce themselves using a method called mitosis. When a eukaryote cell senses that there [...]
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 [...]
A model of an enzyme reacting with another molecule and breaking it into two pieces. Each little ball represents an atom.This enzyme, lysozyme, breaks up bacteria in your blood to keep [...]
A tower made of Lego To see how you can make lots and lots of different molecules of RNA just by rearranging the four purines that RNA is made out [...]
Building a model of DNA: a DNA project DNA active learning project To see how DNA unzips and zips up again, get a bunch of kids together, and two pieces [...]
A strand of DNA (seen through an electron microscope) Let's start with RNA If the RNA theory of the origin of life is right, then after a short time, about [...]
