单词 | primer |
释义 | primer [`prīm·ǝr] ENGINEERING In general, a small, sensitive initial explosive train component which on being actuated initiates functioning of the explosive train, and will not reliably initiate high explosive charge; classified according to the method of initiation, for example, percussion primer, electric primer, or friction primer. MATERIALS A prefinishing coat applied to surfaces that are to be painted or otherwise finished. Also known as prime coat. MOLECULAR BIOLOGY 1. A short ribonucleic acid (RNA) sequence that is complementary to a sequence of deoxyribonucleic acid (DNA) and has a 3'-OH terminus at which a DNA polymerase begins synthesis of a DNA chain. 2. A short sequence of DNA that is complementary to a messenger RNA (mRNA) sequence and enables reverse transcriptase to begin copying the neighboring sequences of mRNA. 3. A transfer RNA whose elongation starts RNA-directed DNA synthesis in retroviruses. |
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