1.The persistence of bacteria throughout evolutionary time i

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1.The persistence of bacteria throughout evolutionary time is due to their genetic homogeneity (i.e.,sameness).
2.They divide by binary fission,without mitosis or meiosis.
3.Genetic variation in bacteria is not known to occur,nor should it occur,because of their asexual mode of reproduction.
4.Bacterial cells conjugate to mutually exchange genetic material.
5.Their genetic material is confined within a nuclear envelope
单选

1、persistence (n.)持续;持久
bacteria (n.) pl.of bacterium 细菌
evolutionary (a.) 发展的,进化的,渐进的
homogeneity (n.) 同种;同质
这句话大意是：
细菌在整个进化过程中的持续性取决于它们的基因性.
（我也不知道这句话什么意思,只能给你翻译了.）
2、binary 二元的,由二部分构成的
fission 分裂
mitosis 有丝分裂
meiosis 减数分裂
它们直接分裂成两部分,不需要有丝分裂或减数分裂.
（这不是最简单的细胞分裂方式,即无丝分裂么）
3、asexual 无性的
因为细菌是无性生殖,所以细菌中的基因突变是不可知的,理论上不应该发生的.
4、Bacterial (a.)细菌的,细菌引起的
conjugate (vt.)使结合,使成对(vi.)结合(a.)结合的
mutually (ad.)互相,彼此
菌类细胞成对结合在一起彼此交换它们的基因物质（核酸）.
5、它们的基因物质都包含在（细胞核的）核膜中.
（如果这句话和上面几句有上下文联系,这句话应翻译为：）
（他们的基因物质都包含在拟核区域中.）

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