【英语时差8,16】抗体如何预防艾滋病？B

 Some viruses, including HIV, which is responsible for AIDS, evolve even faster than bacteria. Unlike bacteria (as well as plants and animals), which carry their genetic¹ information in the form of DNA², these viruses carry their genetic information in a similar molecule³ called RNA. When RNA is copied to make a new virus, the process is less accurate and far more mutations occur than when DNA is copied. That means more variety among the offspring and more chances that a few of them will escape the antibodies. In fact, viruses evolve so quickly that the same virus in two individuals often evolves into two different strains. All living organisms adapt to changes in their environment but RNA viruses, like HIV, adapt much faster because they produce more offspring with more variation.

1 genetic   

adj.遗传的，遗传学的

参考例句：

• It's very difficult to treat genetic diseases.遗传性疾病治疗起来很困难。
• Each daughter cell can receive a full complement of the genetic information.每个子细胞可以收到遗传信息的一个完全补偿物。

2 DNA   

(缩)deoxyribonucleic acid 脱氧核糖核酸

参考例句：

• DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。
• Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。

3 molecule   

n.分子，克分子

参考例句：

• A molecule of water is made up of two atoms of hygrogen and one atom of oxygen.一个水分子是由P妈̬f婘̬ 妈̬成的。
• This gives us the structural formula of the molecule.这种方式给出了分子的结构式。