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14 Cards in this Set
- Front
- Back
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cell membrane
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permeable outer layer of a cell that consists of a phospholipid bilayer embeddedwith protiens; plasma membrane or cytoplasmic membrane
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nucleus
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cellular organelle enclosed by a double-layered porous membrane & containing DNA; dense core of an atom containing protons & nuetrons
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organelles
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a part of a cell that performs a specialized function
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isotonic
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a solution w/ the same osmotic pressure as the solution (usually body fluids) with which it is compared
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enzyme
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protein that catalyzes(speeds up) a specific biochemical reaction
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energy
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an ability to move something & thus do work
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lysosome
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organelle that contains digestive enzymes
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peroxisome
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a small organelle present in the cytoplasm of many cells and that contains the reducing enzyme catalase and usually some oxidases
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endocytosis
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process by which a cell membrane envelops a substance & draws it into the cell in a vesicle
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stem cell
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an undifferentiated cell that can divide to yield two daughter stem cells or a stem cell & a progenitor cell
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DNA
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deoxyribonucleic acid
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translation
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assembly of an amino acid chain according to the sequence of a base triplets in an mRNA molecule
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coenzyme
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a nonprotein organic molecule required for the activity of a particular enzyme
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selectively permeable
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Selective permeability means that the cell membrane has some control over what can cross it, so that only certain molecules either enter or leave the cell. Molecules can cross the plasma membrane in three main ways
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