易混淆的单词： dnaDna

Dna told the body how to build proteins .

脱氧核糖核酸告诉身体如何建立蛋白质。

This region of dna was conserved over millions of years of evolution .

脱氧核糖核酸中的这个片段在数百万年的进化中得以保存下来。

The researchers identified short stretches of dna that inactivate genes responsible for antibiotic resistance in bacteria .

这里的研究人员发现，一小段脱氧核糖核酸（dna）可以使细菌中的抗生素抗性基因失去活力。

A gene is a strand of dna that holds the code for the amino acids that make proteins .

基因是为合成蛋白质的氨基酸指定遗传密码的脱氧核糖核酸（dna）链。

Antioxidants help to neutralise free radicals destructive by-products of metabolism in the body that can damage cell membranes and dna .

抗氧化剂帮助中和了游离基体内新陈代谢所带来的毁坏性的副作用会破坏细胞膜和脱氧核糖核酸。