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24 Cards in this Set
- Front
- Back
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cell wall
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inflexible barrior that protects the cell and gives it support
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plasma membrane
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flexible boundry betweem the cell and its enviroment; allos materials such as water and nutrients to enter and waste products to leave
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ribosome
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nonmembrane-bound organelles in the nucleus where proteins are assembled
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Hooke
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an english scientist who used a compund light microscope to study cork, the dead cells of oak bark; he gave the the box shaped structures the name cell
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schwann
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made similar observations on animals; the observations and conclusions of these scientists are summarixed as the cell theory
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schleiden
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observed a variety of plants and concluded that all plants are composed of cells
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vsn leeuwenhoek
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used the simple light microscope because it contained one lens and used light to view objects in the 1600s
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electron microscope
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was developed in 1930s and 40s; this microscope used a beam of electrons instead of light to maagnify structures up to 500000 times their actual size
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cell theory
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1 all organisms are composed of one or more cells
2 the cell is the basic unit of structure and organiztion of organisms 3 all cells come from preexisting cells |
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compound microscope
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use a seies of lenses to magnify objects in steps magnify up to 1500 x
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nucleus
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center of the atom; controles the functions of the cell
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eukaryote
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unicellular and multicellular... contain a true nucleus and membrane bound organelles
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prokaryote
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unicellular.. lack internal membrane cells
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homeostasis
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to maintain conditions suitable for surbibal; process of maintaining equlibrium in cells internal enviroments
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chloroplast
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chlorophylled containing organelles found in the cells of green plants and some protists. CAPTURE LIGHT ENERGY AND CONVERT TO CHEMICAL ENERGY
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plastid
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group of plant organelles that are used for storage of starches lipids or pigments
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fluid mosaic model
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structual model of the plasma membrane where molecules are fee to move sideways within a lipid bilayer
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selectively permeable
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feature of the plasma membrane that maintains homeostasis within a vell by allowing some molecules into the cell while keeping others out
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dynamic equilibrium
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result of diffusion where there is continuous movement of particles but no overall change in concentration
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enzyme
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type of protein found in all living things that changes the rate of chemical reactions
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mitochondria
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trnsform enerygy stored in food molecules has a highly folded inner membrane that produces energy storing molecules
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ribosome
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proteins are assembled
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vacuole
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temparary storage of materials
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nucleolus
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produces ribosomes
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