| 单词 | molecular fossil |
| 释义 | > as lemmasmolecular fossil molecular fossil n. a molecule whose presence in ancient rocks is regarded as evidence of the existence or early development of life; (in extended use) a molecule regarded as representing a feature of an earlier stage in development or evolution. ΘΚΠ the world > life > biology > organism > fossil > [noun] > types of astroite1610 belemnite1646 mussel-stone1660 scallop-stone1668 trochite1676 conchite1677 ophiomorphite1677 pectinite1677 worm-stone1677 musculite1681 serpent-stone1681 sugar-plum1681 glossopetraa1684 ague shell1708 forket1708 mytilite1727 grit1748 phytolithus1761 fairy beads1767 fairy fingers1780 fairy arrow1794 gryphite1794 ram's horn1797 hysterolite1799 tubulite1799 thunder-pick1801 celleporite1808 ceraunite1814 seraph1822 serpulite1828 coprolite1829 subfossil1831 pencil1843 trigonellite1845 buccinite1852 rudist1855 guide fossil1867 witch's cradle1867 coccolith1868 fairy cheeses1869 discolith1871 Portland screw1871 spiniferite1872 cyatholith1875 cryptozoon1883 sabellite1889 palaeospecies1895 homoeomorph1898 rudistid1900 megafossil1932 scolecodont1933 macrofossil1937 hystrichosphere1955 palynomorph1961 acritarch1963 molecular fossil1965 mitrate1967 1965 M. Calvin in Proc. Royal Soc. A. 288 443 We are going to spend much of our time tracing organic evolution back in so far as we can trace it back in terms of ‘molecular fossils’ from the earliest well recognized fossils of morphological form. 1969 Sci. Jrnl. Apr. 36 The exciting studies of Calvin, who has attempted to prove the existence of what he calls ‘molecular fossils’, have not, however, firmly established the biogenic nature of these substances. 1971 Nature 30 July 325/2 The search for geological evidence about the origin and evolution of life on Earth has led to detailed searches for morphological and molecular fossils in Early Precambrian sedimentary rocks. 1987 Proc. National Acad. Sci. U.S.A. 84 7383 We propose that such 3′-terminal tRNA-like structures are in fact molecular fossils of the original RNA world, where they tagged genomic RNA molecules for replication. 1996 European Jrnl. Biochem. 235 449 S- and Ω-crystallins appear to be lens-specific..and, except for one S-crystallin polypeptide (SL11/Lops4; possibly a molecular fossil), lack enzymatic activity. < as lemmas |
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