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a [modifier] nucleotide
nucleotide 是可数名词，单数前常用冠词 a。
A nucleotide consists of a sugar, a phosphate, and a base.
核苷酸由一个糖、一个磷酸和一个碱基组成。
核苷酸
先理解核心含义，再看它在真实句子里的用法。
核苷酸
a chemical unit consisting of a nucleoside combined with a phosphate group; it is the basic building block of DNA and RNA
A nucleotide consists of a sugar, a phosphate, and a base.
核苷酸由一个糖、一个磷酸和一个碱基组成。
构成DNA或RNA生物聚合物分子的单体。每个核苷酸由含氮杂环碱基(或核碱基)、五碳糖(DNA中为脱氧核糖,RNA中为核糖)和磷酸基团组成；碱基可为双环嘌呤或单环嘧啶。
The monomer constituting DNA or RNA biopolymer molecules. Each nucleotide consists of a nitrogenous heterocyclic base (or nucleobase), which can be either a double-ringed purine or a single-ringed pyrimidine; a five-carbon pentose sugar (deoxyribose in DNA or ribose in RNA); and a phosphate group.
核苷的磷酸酯；核酸(DNA或RNA)的基本结构单位
a phosphoric ester of a nucleoside; the basic structural unit of nucleic acids (DNA or RNA)
Each nucleotide contains a phosphate group, a sugar, and a base.
每个核苷酸包含一个磷酸基团、一个糖和一个碱基。
Scientists compare the order of nucleotides to identify genetic differences.
科学家比较核苷酸的顺序来识别基因差异。
A mutation can change a single nucleotide in a gene.
突变可以改变基因中的一个核苷酸。
nucleotide 是可数名词，单数前常用冠词 a。
A nucleotide consists of a sugar, a phosphate, and a base.
核苷酸由一个糖、一个磷酸和一个碱基组成。
复数形式 nucleotides 用于泛指或表示多个核苷酸。
Nucleotides are the building blocks of DNA and RNA.
核苷酸是 DNA 和 RNA 的构建单元。
nucleotide 作定语修饰名词时用单数形式。
The nucleotide sequence determines the genetic information.
核苷酸序列决定了遗传信息。
用 of 结构表示所属关系，强调特定来源或对象。
Researchers compared the nucleotides of the two genes.
研究人员比较了两个基因的核苷酸。
Not this
DNA is made up of nucleotide.
Use this
DNA is made up of nucleotides.
nucleotide 是可数名词，表示多个基本单元时要用复数 nucleotides；这里指 DNA 中的许多核苷酸，因此不能省略 -s。
Not this
Nucleotide is the basic unit of DNA.
Use this
A nucleotide is the basic unit of DNA.
单数可数名词 nucleotide 首次提及时前面需要加冠词 a/an，这里泛指一个核苷酸，所以用 A nucleotide。
Not this
These two nucleotides are differ from each other.
Use this
These two nucleotides differ from each other.
differ 是动词，前面不需要 be 动词；这是受汉语“是不同的”影响而多加 are。去掉 are 后句子语法才正确。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
核苷酸序列
The nucleotide sequence of the sample was compared with a reference genome.
将该样本的核苷酸序列与参考基因组进行了比较。
核苷酸碱基
DNA contains four different nucleotide bases: adenine, thymine, cytosine, and guanine.
DNA含有四种不同的核苷酸碱基：腺嘌呤、胸腺嘧啶、胞嘧啶和鸟嘌呤。
单核苷酸多态性
The researchers identified a single nucleotide polymorphism linked to the disease.
研究人员发现了一个与该疾病相关的单核苷酸多态性。
核苷酸替换
A single nucleotide substitution can change the amino acid produced by a gene.
单个核苷酸替换可以改变基因产生的氨基酸。
核苷酸代谢
Errors in nucleotide metabolism can cause various genetic disorders.
核苷酸代谢异常可导致多种遗传疾病。
核苷酸结合域
This enzyme has a nucleotide-binding domain at its N-terminus.
这种酶的N端有一个核苷酸结合域。
Use nucleotide naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：nucleo-（核，同 nucleus）+ -tide（音似 tide 潮汐）——想象细胞核里潮水般串起的核苷酸，构成 DNA/RNA 链。
语域：formal 常见场景：学术写作、教科书、专业报告 这是一个专业科学术语，多用于生物化学、分子生物学等学术或专业场合，如论文和教材；日常对话中较少使用。
这些词都以 /aɪd/ 结尾，与 nucleotide 的最后一个音节 /taɪd/ 押韵，其中 tide 和 peptide 拼写和读音最接近。注意：nucleic (/nuːˈkliːɪk/) 和 nucleus (/ˈnuːkliəs/) 虽与 nucleotide 开头相似，但读音并不押韵。
Dictionary facts from ECDICT, WIKTIONARY.