Cell Structure

Every living organism is made up of cells. There are two different kinds of cells - Prokaryotic cells are simpler and do not have a nucleus (also called the "control center" of the cell) or other organelles (a sub-"organ" within the cell body that has a special function). Eukaryotic cells are larger and much more complicated, with many organelles that each have their own job to do within the cell.

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Photo of plant cell structure

Plant cell structure
Photo Credit: Wikimedia Commons

 
Photo of animal cell

A diagram of an animal cell in three dimensions
Photo Credit: Wikimedia Commons

 
Photo of red blood cells

Human red blood cells
Photo Credit: Wikimedia Commons

Microscopic eyes