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26 Cards in this Set

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  • Back
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light microscope
light passes through one or more lenses to produce an enlarged image of a specimen
electron microscope
forms an image of a specimen using a beam of electrons rather than light
magnification
the quality of making an image appear larger than its actual size
None
resolution
a measure of the clarity an image
scanning tunneling microscope
uses a needle-like probe to measure differences in voltage caused by electrons that tunnel from the surface of the viewed object
cell theory
1.all living things are made of 1+ cells 2.cells are the basic units of structure and function in organisms 3. all cells arise from existing cells
None
cell membrane
outer boundary of the cell; encloses cell and separates cell's interior from its surroundings; regulates what enters and leaves cell
None
cytoplasm
the cell interior
cytoskeleton
a system of microscopic fibers
ribosomes
cellular structures on which proteins are made
prokaryote
a single-celled organism that lacks a nucleus and other internal compartments
cell wall
surrounds the cell membrane that provides support and stucture
flagella
long, thredlike srtuctures that protrude from the surface of the cell and enable movement
eukaryote
an organism whose cells have a nucleus
nucleus
an internal compartment that houses the cell's DNA
organelle
a structure that carries out specific activities in the cell
cilia
hairlike structures that proturde from the surface of eukaryotic cells
phospholipid
a lipid bilayer made of a phosphate group and two fatty acids; has both a polar head and two nonpolar tails
lipid bilayer
phospholipids arranged in a double layer
endoplasmic reticulum (ER)
an extensive system of internal membranes that move proteins and other substances through the cell; membranes are made of a lipid bilayer
vesicle
a small, membrane-bound sac that transports substances in cells
Golgi apparatus
a set of flattened, membrane-bound sacs that serves as the packaging and distribution center of the cell
lysosomes
small, spherical organelles that contain the cell's digestive enzymes
mitochondria
organelles that harvest energy from organic compounds to make ATP, the main energy currency of cells
chloroplasts
organelles that use light energy to make carohydrates from carbon dioxide and water
central vacuole
stores water and may contain sustances, including ions, nutrients, and wastes; supports the cell when full