DNA, Genes, and Chromosomes
完成条件
按索引浏览词汇表
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N
Nitrogenous baseOne of the four chemical bases in DNA: adenine, thymine, cytosine, or guanine. | |
NucleotideThe basic building block of DNA, consisting of a sugar, a phosphate group, and a nitrogenous base. | |
NucleusThe membrane-bound organelle that contains most of a cell's DNA in plants and animals. | |