Cells are the basic unit of the organization of organisms and are made from other cells. Organisms are made up of one or more cells. So Eukaryotic cells (like us) are cells that have membrane-bound structures called Organelles inside of them. The electron microscope was invented in the 1940’s, and it works by using a beam that magnifies structures 500,000 times their actual size. There are two main kinds of electron microscopes called scanning microscopes which scan’s the cells surface to create their three dimensional shape, and transmission microscopes which lets scientists to study structures that are contained within a cell (eukaryotic cells). Cells that don’t contain membrane-bound structures are called prokaryotes (like bacteria).

How many other kinds of cells are there?