The cell is the basic unit of life. There are two kinds of cells: prokaryotes
and eukaryotes. Prokaryotes don't have a nuclear membrane - a membrane that
surrounds the nucleus allowing only certain chemicals to pass through. Eukaryotes,
like the cell pictured below, do have a nuclear membrane and other small cell
organelles that prokaryotic cells often lack.
Sometimes a cell can be an organism by itself (yeast, bacteria). Other organisms
- humans, trees, sharks - are multicellular. These organisms are made up of
many specialized cells (muscle, skin, xylem, brain cells ... ). All of your
genetic information is stored inside of almost every single one of your cells.
Humans contain more than 75,000,000,000,000 cells.
Next, find out where the cell stores genetic material.
Locating Genetic Information Next