Presentation on theme: "Cell Structure & Function"— Presentation transcript:
1Cell Structure & Function (What do cells look like?)(What do cells do?)
22 main types of cells Prokaryotes (Prokaryotic) Eukaryotes (Eukaryotic)
3Prokaryotes Simple cells Unicellular only Typical size 1-2 μm in diameterNo nuclear membrane or other membrane-bound organellesDNA is in a tangled loopSome prokaryotes have a second loop of DNA called a plasmidCell walls vary but can be very “tough” to help the cell survive harsh environments
5Eukaryotes Complex cells Both unicellular & multicellular organisms. (All multicellular organisms are this type.)Typically about 10x larger than prokaryotic cellsMany organelles – some common, some only in plant cells, some only in animal cellsDNA is extremely long so the cell condenses it to form chromosomesSome eukaryotic cells differentiate. This means they can become different types of cells: skin cells, muscle cells, blood cells, fat cells, etc. Plants have different types of cells too.
7Comparing prokaryotes to eukaryotes Prokaryotic cellEukaryotic cellSimple or Complex?Size of Cell?Unicellular, Multicellular, or BothAny membrane-bound organelles?What does the DNA look like?
8Comparing prokaryotes to eukaryotes Prokaryotic cellEukaryotic cellSimple or Complex?SimpleComplexSize of Cell?1 – 2 μmTypically 10x largerUnicellular, Multicellular, or BothUnicellularBothAny membrane-bound organelles?NoYesWhat does the DNA look like?Tangled loopChromosomes
9Organelles Little “organs” inside cells. Only found in eukaryotic cells.Each type of organelle has its own purpose/function for the cell.Organelles may have once been prokaryotic cells that were engulfed and then incorporated into a larger cell instead of being broken down as food.