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| a molecule that is secreted by one cell and that alters the activities of another cell |
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| one or more segments DNA that together produce a functional RNA molecule |
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| the synthesis of a protein from a gene |
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| all the DNA molecules within a cell of an organism |
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| a gene that moves from one chromosome to another within a cell |
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| a change in the sequence of bases within a gene |
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| a substitution, addition, or deletion of a single base within a gene |
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| an RNA virus that synthesizes a DNA copy of its genes and then inserts this copy into a DNA molecule |
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| a spherical structure, formed of RNA and proteins, that serves as a site for protein synthesis |
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| a cluster of organic molecules that uses the cell of an organism to reproduce itself |
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