DNA和RNA都是由核苷酸构成，每一单元为由三部分组成的分子，一端是磷酸盐，中部是一种糖，另一端是碱基。
DNA and RNA are made of nucleotides. Each unit is a three-part molecule with a phosphate at one end, a sugar in the middle and a variable nucleobase at the other end.
它还与核苷酸互换使用，尽管后者是由一个五碳糖、磷酸和一个碱基组成。
The term is also used interchangeably with “nucleotide” although the latter is composed of a five-carbon sugar joined to a phosphate group and one of the bases.
腺（嘌呤核）苷二磷酸：一种由腺嘌呤和核糖再加上两个磷酸组成的核苷酸。其中第二个磷酸以高能键与第一个磷酸结合。
ADP (adensine diphosphate) A nucleotide consisting of adenine and ribose with two phosphate groups attached. The second phosphate is attached to the first by a high-energy bond.
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