Cells, its functions and structure
Cells are the smallest living units ofan organism. All cells have three things in common no matter what type of cell they are. All cells have a cell membrane which separates the inside the cell from its environment; cytoplasm, which is a jelly-like fluid, and DNA which is the cell's genetic material. 1. Cell There are two broad categories of cells. The first category is eukaryotic cells. They have organelles which include the nucleus and other special parts. Eukaryotic cells are more advanced,complex cells such as those found in plants and animals. The second category is prokaryotic cells . They don't have a nucleus or membrane enclosed organelles. They do have genetic material but it's not contained with in a nucleus. Prokaryotic cells are always one celled, or unicellular organisms, such as...