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| Occupational Safety and H |
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See Occupational Safety and Health Administration.
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| Oligonucleotide |
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A DNA polymer composed of only a few nucleotides. (See Nucleotide.)
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| Oncogene |
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A gene that contributes to cancer formation when mutated or inappropriately expressed. (See Cellular oncogene, Dominant oncogene, Immortalizing oncogene, Recessive oncogene.)
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| Oncogenesis |
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The progression of cytological, genetic, and cellular changes that culminate in a malignant tumor.
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| Open pollination |
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Pollination by wind, insects, or other natural mechanisms.
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| Open reading frame |
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A long DNA sequence that is unin- terrupted by a stop codon and encodes part or all of a protein. (See Reading frame.)
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| Operator |
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A prokaryotic regulatory element that interacts with a repressor to control the transcription of adjacent structural genes.
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| Organelle |
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A cell structure that carries out a specialized function in the life of a cell.
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| Origin of replication |
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The nucleotide sequence at which DNA synthesis is initiated.
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| OSHA |
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See Occupational Safety and Health Administration.
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| Overlapping reading frame |
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Start codons in different reading frames generate different polypeptides from the same DNA sequence. (See Reading frame.)
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