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| smallest living subunits of a multi-cellular organism such as a human being |
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| made up of phospholipids, cholesterol and proteins |
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| channels to permit passage of materials |
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| bonding site for enzymes and hormones |
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| certain substances are allowed to pass through and others are not |
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| a double membrane with many pores; contains one or more nuclei and chromosomes of the cell |
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| small sphere made of DNA, RNA and protein |
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| long threads of chromosomes |
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| genetic code for one protein |
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| watery solution of minerals, gases and organic molecules that is found between the cell membrane and the nucleus |
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| intracellular structures, often bounded by their own membranes that have specific roles in cellular functioning |
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| also known as ER; extensive network of membranous tubules that extend from the nuclear membrane to the cell membrane; comes in two forms: smooth and rough |
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| ER with ribosomes on its surface |
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| very small structures made of protein and ribosomal RNA; found on rough ER and also floating freely in cytoplasm |
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| flat, membranous sacs, somewhat like a stack of saucers; synthesizes carbohydrates here and also packaged along with material for secretion from the cell |
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| oval or spherical organelles within the cytoplasm bounded by a double membrane |
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| single membrane structures within the cytoplasm that contain digestive enzymes; destroys damaged or worn out cells and cell parts |
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| pair of rod-shaped structures perpendicular to one another located just outside the nucleus; organize the spindle fibers during cell division |
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| mobile thread-like projections through the cell membrane. Cilia usually shorter than flagella; sweep materials across the surface of the cell; flagella a long whip like structure found only on sperm; provides mobility |
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| folds of the cell membrane on the free surface of a cell |
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