CELLS!

The Cell Theory Review All living things are composed of cells (you, me, plants, bugs, fish, Spiderman, Colonel Sanders, Jimmy Neutron, Bacteria, Yeast, Jackie Chan) Cells are the basic units of structure and function in living things (what keeps us upright and helps us live, basically small workers responsible for how we function!) New cells are produced from existing cells (they can’t just appear out of thin air…cells make new cells by dividing!)

Why the classifications? You’re the scientist: Let’s figure out the difference between Prokaryotes and Eukaryotes! With a partner, complete the questions on your notes by examining the images. If you finish early, compare your results with another group.

PROKARYOTES AND EUKARYOTES Both Have: Cytoplasm Ribosomes Plasma Membrane With Plants: Cell Wall With (some) Animals: Flagella Prokaryotes do not have a nucleus! Eukaryotes are more complex Eukaryotes are larger

Why are cells named that way? From Greek words… EU means TRUE. PRO means BEFORE. KARYON means NUCLEUS. Eukaryote = TRUE NUCLEUS; Prokaryote = BEFORE NUCLEUS. All cells have DNA, in eukaryotes it is stored in the nucleus. Prokaryotes don’t have a nucleus, and it floats around in the cytoplasm in an area called the nucleoid. Only eukaryotes have membrane-bound organelles.

Test Yourself! Statement Prokaryotic Eukaryotic 1. Have a nucleus 2. Have membrane-bound organelles 3. Contain genetic material (DNA) 4. Can be single or multi-celled 5. Can only be single-celled. 6. Have a plasma membrane and cytoplasm

How is life organized for MULTI-CELLULAR Organisms? Cells make up tissues which make up organs which make up organ systems which make up organisms We can also take it back to the atomic level..