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| Description of cell membrane (noun: plural: cell membranes) lamellar tissue that surrounds and covers a cell and its contents Samples of cell membrane The cell membrane is semi-permeable and is largely made up of proteins and phospholipids.
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| Description of fission (noun: no plural) a method of asexual reproduction Samples of fission Bacteria and amoebae reproduce by binary fission.
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| Description of molecule (noun: plural: molecules) two or more atoms of the same or different elements that unite because of Van der Waal's forces Samples of molecule The hydrogen molecule is very small compared to a molecule of DNA.
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| Description of ionic compound (noun: plural: ionic compounds) a substance consisting of anions and cations that are joined together by their opposite charges. Samples of ionic compound Sodium chloride NaCl is an example of an ionic compound.
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| Description of heterogeneous equilibrium (noun: no plural) an equilibrium system where the components are not in the same phase Samples of heterogeneous equilibrium Heterogeneous equilibrium results when calcium carbonate is heated in a closed space to form carbon dioxide and calcium oxide.
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| Description of cortex (noun: no plural) outer layer of a gland or organ in the body; tissue next to the external layer in plants Samples of cortex The adrenal cortex and the cerebral cortex are examples of these outer layers or cortices. In plant stems and roots the cortex is between vascular tissue and the epidermis.
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| Description of lecithin (noun: no plural) phosphatidylcholine; phospholipid formed from phosphatidic acid and choline Samples of lecithin Lecithin is a structural component found in cell membranes.
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| Description of calcium (noun: no plural) chemical element with the symbol Ca which is used to make bones and teeth Samples of calcium Calcium plays a role in muscle contraction, nerve conduction and blood clotting.
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| Description of active site (noun: plural: active sites) part of an enzyme where a substrate is accepted and is responsible for its catalytic activity Samples of active site The coiling of an enzyme creates an active site with a precise 3-dimensional structure.
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| Description of advice (noun: no plural) recommendation Samples of advice Medical advice is often ignored by patients.
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