This attaches methyl groups (a carbon atom and three hydrogens) to either adenine or cytosine, two of the four chemical bases that form the alphabet of DNA, depending on the gene involved.
腺嘌呤和胞嘧啶是DNA四大成分其中之二，而到底附着于哪一个则取决于具体的基因。
He USES zeroes and ones to represent the very first chemical building blocks of life (most likely compounds based on adenine, thymine, guanine, cytosine or uracil).
他用许多0和1来表示最早期时生命的化学成分(很可能是由腺嘌呤、胸腺嘧啶、鸟嘌呤、胞嘧啶和尿嘧啶组成的化合物)。
The genetic information of all living cells is stored in the DNA composed of the four canonical bases adenine (a), cytosine (c), guanine (g) and thymine (t).
所有活细胞的基因信息都储存在由四种碱基，即腺嘌呤(A)、鸟嘌呤(G)、胞嘧啶(C)、胸腺嘧啶(T)构成的DNA里。
This article's examples use DNA, which consists of two strands of adenine (A), cytosine (C), thymine (T), and guanine (G) nucleotides.
本文的示例使用DNA，DNA由腺嘌呤（A）、胞嘧啶（C）、胸腺嘧啶（T）和鸟嘌呤（G）组成的核苷酸双螺旋组成。
The most abundant bases are cytosine, thiamine , and uracil ( pyrimidines ) and adenine and guanine ( purines ) .
最丰富的碱基是胞嘧啶， 胸腺嘧啶， 尿嘧啶，腺嘌呤和鸟嘌呤。
Adenine and guanine are purines and cytosine and thymine are pyrimidines.
腺嘌呤和鸟嘌呤是嘌呤和胞嘧啶和胸腺嘧啶是嘧啶。
The most abundant bases are cytosine, thiamine, and uracil (pyrimidines) and adenine and guanine (purines).
最丰富的碱基是胞嘧啶，胸腺嘧啶，尿嘧啶，腺嘌呤和鸟嘌呤。
What relative proportions of adenine, guanine, thymine, and cytosine would you expect to find in the two DNA samples? What assumptions have you made?
在这两个DNA样品中腺嘌呤、鸟嘌呤、胞嘧啶、胸腺嘧啶之间的相互比例存在怎样的关系？
There are just four kinds: adenine, thymine, guanine and cytosine.
只有4种：腺嘌呤、胸腺嘧啶、鸟嘌呤和胞核嘧啶。
There are just four kinds: adenine, thymine, guanine and cytosine.
只有4种：腺嘌呤、胸腺嘧啶、鸟嘌呤和胞核嘧啶。
应用推荐