These so-called viral fossils are not mineralized relics but rather bits of genetic code held over in the genome of a modern-day hostorganism.
这些所谓的病毒化石并不是矿化后的遗迹,而是存在于现在宿主机体里的基因代码。
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Biotechnology companies spend years figuring out the right combination of mutant hostorganism and reactor conditions to fashion a protein therapy that is safe and effective.
Parasitism is a kind of predator-prey relationship in which one organism, the parasite, derives its food at the expense of its symbiotic associate, the host.