In the ribosome, the nucleotide sequence of the mRNA is translated by the tRNA which carry the related amino acids.

在核糖体中，mRNA 的核苷酸序列由携带相关氨基酸的 tRNA 翻译。

Our 46 chromosomes come in 23 pairs of two homologous chromosomes, which code for the same traits and therefore have similar nucleotide sequences.

我们的46条染色体由23对同源染色体组成；同源染色体编码相同性状，因此具有相似的核苷酸序列。

Now on a molecular level, DNA is made up of two strands of nucleotides, so each gene is just a segment of this nucleotide sequence.

在分子水平上，DNA由两条核苷酸链组成，每个基因仅是该核苷酸序列的一小段。

So now End 1 is placed near a similar nucleotide sequence, called the homologous sequence, because it's found in the same spot on the homologous sister chromatid.

现在End 1位于一段相似核苷酸序列附近；这段序列被称为同源序列，位于同源姐妹染色单体上的相同位点。

RNA is complimentary to DNA though, so if an RNA strand has a nucleotide sequence 3' - A A G U C C A G U - 5', then the complimentary DNA or cDNA would be 5' - T T C A G G T C A - 3'.

但RNA与DNA之间互补，所以如果一条RNA链拥有如下核苷酸序列：3' - A A G U C C A G U - 5'，那么与之互补的DNA便是5' - T T C A G G T C A - 3'。