1. microorganisms of nucleotide fermentation 
   核苷酸发酵微生物
2. A nucleotide molecule that consists of a combination of two nucleotide units. 
   二核苷酸两个单核苷酸结合而成的核苷酸分子
3. A nucleotide containing deoxyribose that is a constituent of DNA. 
   脱氧核苷酸一种核苷酸，含有构成dna的成分——脱氧核糖
4. The smallest unit of DNA at which a mutation can occur; a nucleotide. 
   突变子能够产生巨变的脱氧核糖核酸的最小单位；一个核苷酸
5. An enzyme that catalyzes the hydrolysis of a nucleotide to a nucleoside and phosphoric acid. 
   核苷酸酶催化核苷酸转化成核苷和磷酸的酶

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