Two major kinds of nucleic acids are found in living things: deoxyribonucleic acid or dna and ribonucleic acid or rna . 生物体中存在着两大类核酸：脱氧核糖核酸和核糖核酸。
Nucleotide sequences homologous to oncornaviruses dna products have been observed in human leukaemic cells . 在人白血病细胞中，已经观察到与肿瘤毒病DNA产物相同的核苷酸序列。
Transformation efficiency is greatest with circular plasmids containing only small inserts of passenger dna . 使用带有一小段客座DNA的插入序列的环状质粒进行转化，较率会最高。
We presented the history of recombinant dna research and our guidelines, and invited the committee's opinions . 我们介绍了重组体DNA的历史和我们的准则，并征求这个委员会的意见。
they gently heated the "hybrid" / dna to separate the strands(this is called thermal denaturation). 他们还将“杂合”DNA分子缓慢加热（这叫加热变性）
Transposable elements, or insertion elements, are dna sequences which can be inserted into many different sites in chromosomes . 转位因子或插入因子是能够插入到染色体不同位点的DNA序列。
We need a comprehensive assessment of the recombinant dna issue, preferably under the auspices of the federal government . 对于重组体DNA问题，我们需要有一个全面的估价，而且最好由联邦政府主办。
