2The cellThe basic unit of structure and function in all living things.
3Without Jansenn's microscope invention we would not have discovered cells3
4The average cell is between 2 and 200µm (micrometers). To give you an idea of how big a micrometer is, the thickness of a strand of human hair ranges from 50 to 200 micrometers. Dark hair is usually thicker than blonde hair.The smallest particle that can be seen by the human eye is about 10 micrometers. The eyepiece of your microscope has a special tool to measure micrometers.Cells Alive
5Entering (and exiting) the cell CELL WALLA stiff wall that surrounds the cell membrane, giving the cell a rigid boxlike shapeFunction: protection & supportThis structure is found in plant & bacteria cellsCELL MEMBRANEForms the outside boundary that separates the cell from its environmentFunction: controls what comes in and out of the cell
20Golgi Bodies The cell’s “mailroom” Receives proteins and other materials from the ER, packages them and distributes them to other parts of the cell.
21VACUOLES Storage area of the cell Stores food and water Plants have one large vacuole for waterSome animal cells have them & others do not
22Lysosomes Cell’s cleanup crew Breaks down old cell parts and releases the substances so they can be used again.
23ChloroplastsCapture energy from the sunlight and use it to produce food for the cellFound only in the plant cell
24Eukaryotes Nucleus has a permeable membrane surrounding it Nucleus contains the organism’s genetic material (DNA)Most organelles also have a membrane around themMostly eukaryotic kingdoms are multicellular
25Plant Cells Animal Cells Smaller vacuoles, some have no vacuolesNo cell wall and no chloroplastMore lysosomesMore mitochondriaLarger vacuolesChloroplastCell wallCells have definite shape
26Prokaryotes Bacteria Kingdoms ONLY Have no nucleus (lack a nucleus) Have only ribosomes, cytoplasm, and genetic material (DNA or RNA)Genetic material floats freely in the cytoplasm (No nucleus)Cell Wall and cell membraneALL unicellular