英语翻译1.Viruses are simple,acellular entities consisting of on

英语翻译
1.Viruses are simple,acellular entities consisting of one or more molecules of
either DNA or RNA enclosed in a coat of protein (and sometimes,in addition,
substances such as lipids and carbohydrates).They can reproduce only within
living cells and are obligately intracellular parasites.
2.Viruses are cultured by inoculating living hosts or cell cultures with a
virion preparation.Purification depends mainly on their large size relative
to cell components,high protein content,and great stability.The virus
concentration may be determined from the virion count or from the number
of infectious units.
3.All viruses have a nucleocapsid composed of a nucleic acid surrounded by
a protein capsid that may be icosahedral,helical,or complex in structure.
Capsids are constructed of protomers that self-assemble through
noncovalent bonds.A membranous envelope often lies outside the
nucleocapsid.
4.More variety is found in the genomes of viruses than in those of procaryotes
and eucaryotes; they may be either single-stranded or double-stranded DNA or
RNA.The nucleic acid strands can be linear,closed circle,or able to assume
either shape.
5.Viruses are classified on the basis of their nucleic acid’s characteristics,
capsid symmetry,the presence or absence of an envelope,their host,the
diseases caused by animal and plant viruses,and other properties.

1 病毒很简单 一个细胞的实体是由一个或更多个 DNA或RNA组成的 并且包裹在蛋白质中（除此之外 有时 是包裹在像糖类脂类这样的物质中） 它们只能在活细胞中繁殖 并且寄生于细胞内 2 细菌有时通过注射于活着的寄主体或是有着病毒体配置品的细胞培养物中来培养.净化主要依靠他们相对于其它细胞成分的大体积 他们的高蛋白含量 和 强稳定性. 病毒的浓度可能由病毒体数量 和 可传染的单元的数量决定.3. 所有的病毒都有由包裹在蛋白质壳中的核酸组成的核壳体, 使得它们在结构上有二十面 螺旋且复杂. 这些蛋白质壳是由病原体（原体通过共价键自己组合）组成的.核壳体外包裹着一层膜 4.病毒染色体组的种类数量比真核生物原核生物的种类数量大得多 它们可以是单股的或者是双股的DNA或RNA. 核酸可以是线性的 封闭的圆 或者两者都有点.5.病毒是通过它自身核酸的性质 衣壳的对称性 有无薄膜 他们的寄主 被动物或植物病毒导致的疾病 或其它特性分类的.
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