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CELL pp
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LEVELS OF ORGANIZATION
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HISTORY Hooke: observed cork
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Leeuwenhoek: first to observe living cells
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CELL THEORY All living things composed of cells.
Cells are basic units of structure and function. Cells come from pre-existing cells
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BASIC PARTS OF A CELL Cell membrane Genetic material (DNA)
Ribosomes: make proteins Cytoplasm: surrounds the cell’s organelles
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Cell membrane Selectively permeable: controls what comes into and out of the cell Made of phospholipids that form a lipid bilayer
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Cell membrane has proteins
peripheral: attached to the surface integral: embedded in the bilayer
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Fluid mosaic model: cell membrane behaves more like a fluid than solid
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CELL TYPES Prokaryotic: oldest living cells that lack membrane-bound organelles and are unicellular Eukaryotic: contain a membrane-bound nucleus and organelles
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Prokaryotic Cell Prokaryotic
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Animal Cell
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Plant Cell
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Plant cells similar to animal cells since both are eukaryotic
Plants also have: A cell wall Chloroplasts: organelles that undergo photosynthesis Large vacuole: stores water
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