【英语时差8,16】DNA2

 The sample didn’t have any visible animal or plant remains¹ in it, but researchers found loads of DNA² anyway. They have already identified such animals as lemmings, bison, and –going way back– woolly mammoths. But if there were no carcasses, how did the DNA get in the soil? That isn’t known, though some scientists speculate that animal dung contains enough stray cells to deposit DNA. That may mean a bison pooped here thousands of years ago, unknowingly dropping its genetic³ signature–just waiting for future biologists to dig it up again.

1 remains   

n.剩余物，残留物；遗体，遗迹

参考例句：

• He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
• The remains of the meal were fed to the dog.残羹剩饭喂狗了。

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 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。