| 单词 | junk dna |
| 释义 | > as lemmasjunk DNA junk DNA n. Molecular Biology segments of DNA that have no clear function in the genome (such as coding for a protein, regulating transcription, etc.), often consisting of repetitive sequences of nucleotides. ΘΚΠ the world > life > biology > biological processes > genetic activity > genetic components > [noun] > nucleic acid > DNA > section of operator1961 satellite1962 junk DNA1963 spacer1963 transposon1974 antisense1977 retroposon1983 retrotransposon1985 retroelement1988 microsatellite1989 1963 Jrnl. Ultrastruct. Res. 9 39 While current evidence makes plausible the idea that all genetic material is DNA (with the possible exception of RNA viruses), it does not follow that all DNA is competent genetic material (viz. ‘junk’ DNA), nor that all Feulgen-positive material is active DNA. 1989 A. J. Jeffreys in J. R. Durant Human Origins iii. 29 Clear examples of junk DNA are pseudogenes, DNA sequences which are related to functional genes but which carry various mutations which prevent their expression. 2000 Chicago Tribune (Nexis) 27 June 1 Also preserved is the detritus from millions of years—failed genes, dead genes, viral genes—all the strange entities called pseudogenes..transposons and retrotransposons—collectively referred to as ‘junk DNA’. 2014 Proc. National Acad. Sci. 111 10630/1 Once relegated to junk DNA, today many repeat elements emerge as potent functional genetic units. < as lemmas |
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