Words similar to extant
Example sentences for: extant
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Among extant biological entities, these polymerases are encoded largely by RNA viruses and retroid viruses, but a reverse transcriptase had been recruited by eukaryotes as the catalytic subunit of the telomerase [ 98 99 ] . There seems to be a distinct possibility that both classes of RDRPs are vestiges of the ancient RNA world that have been largely displaced from cellular biochemical machinery at an early stage of evolution, because of the deleterious effects of RNA replication in DNA-based organisms, while surviving in selfish genetic elements.
I believe the most unsettling image currently extant in popular culture is that of Bob Dole under the influence of Viagra.
This phylogenetic tree topology resembles that of several proteins involved in core cellular functions such as the DNA recombinase RecA, aminoacyl tRNA synthetases, RNA polymerase and other RNA metabolism proteins [ 21 22 23 ] . This suggests that a CYTH domain was present in the last universal common ancestor of all extant life forms and the extant forms are in part vertically inherited from this ancestral form.
The Christian Church, nevertheless, chose to latch on to the concept of the Virgin Birth long before the sixteenth century ( cf . Tertullian, who lived c. 160-240 A.D.) in any case, and we do not know whether the use of Isaiah 7:14 was to justify an already extant belief with a text, or whether it was to take an already accepted text and graft its meaning, as was then understood, upon the events of the Annunciation to Mary.
The ancestral versions of these domains would not have the adaptations for specific roles possessed by their descendant forms, such as those in extant DDRP or RDRP, and probably functioned as generic RNA-binding and protein-protein interaction domains, with the specificity conferred by catalytic RNA molecules.
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