您要查找的是不是：
- A purine base,C5H5ON5,that is an essential constituent of both RNA and DNA. 鸟嘌呤一种嘌呤碱，分子式为C5H5ON5，为核糖核酸和脱氧核糖核酸的主要组成部分。
- A purine base, C5H5ON5, that is an essential constituent of both RNA and DNA. 鸟嘌呤一种嘌呤碱，分子式为C5H5ON5，为核糖核酸和脱氧核糖核酸的主要组成部分
- Purine base found in DNA and RNA,pairs with thymine in DNA and with uracil in RNA. DNA和RNA中的嘌呤碱，与DNA中胸腺嘧啶和尿嘧啶成对。
- A yellowish-white,crystalline purine base,C5H4N4O2,that is a precursor of uric acid and is found in blood,urine,muscle tissue,and certain plants. 黄嘌呤一种黄白色结晶的嘌呤硷，C5H4N4O2，它是尿酸的前身，常见于血液、尿液、肌肉组织和某些植物中。
- A yellowish - white,crystalline purine base,C5H4N4O2,that is a precursor of uric acid and is found in blood,urine,muscle tissue,and certain plants. 黄嘌呤一种黄白色结晶的嘌呤硷，C5H4N4O2，它是尿酸的前身，常见于血液、尿液、肌肉组织和某些植物中
- A yellowish-white, crystalline purine base, C5H4N4O2, that is a precursor of uric acid and is found in blood, urine, muscle tissue, and certain plants. 黄嘌呤一种黄白色结晶的嘌呤硷，C5H4N4O2，它是尿酸的前身，常见于血液、尿液、肌肉组织和某些植物中
- A yellowish - white, crystalline purine base, C5H4N4O2, that is a precursor of uric acid and is found in blood, urine, muscle tissue, and certain plants. 黄嘌呤一种黄白色结晶的嘌呤硷，C5H4N4O2，它是尿酸的前身，常见于血液、尿液、肌肉组织和某些植物中
- Objective To determine the effect of purine bases and purine nucleosides on thermo-pain threshold and acute withdrawal in morphine dependent rats. 摘要目的：研究嘌呤碱基与嘌呤核苷对吗啡依赖大鼠的热痛阈与急性戒断的影响。
- Abstract: Objective To determine the effect of purine bases and purine nucleosides on thermo-pain threshold and acute withdrawal in morphine dependent rats. 文章摘要: 目的：研究嘌呤碱基与嘌呤核苷对吗啡依赖大鼠的热痛闭与急性戒断的影响。
- In DNA, the two purine bases (adenine and guanine) always bond with the pyrimidine bases (thymine and cytosine), and the pairing is quite specific: adenine with thymine and guanine with cytosine. 嘌呤基（腺嘌呤，鸟嘌呤）总与嘧啶基（胞嘧啶，胸腺嘧啶）配对，并且配对有专一性：腺嘌呤对胸腺嘧啶，鸟嘌呤对胞嘧啶。
- a purine base found in DNA and RNA; pairs with cytosine DNA和RNA中的嘌呤碱，与胞核嘧啶成对
- a purine base found in DNA and RNA; pairs with cytosine. DNA和rna中的嘌呤碱，与胞核嘧啶成对。
- The runner was retired put out at first base. 跑垒者于第一垒上被刺杀出局。
- The runner went to second base on a wild pitch. 一记瞎设让跑垒员跑上了第二垒。
- You cannot enter a military base without a permit. 无通行证者不得擅入军事基地。
- Purine bases and the corresponding nucleosides 嘌呤碱基及其核苷
- Her heavy industry rests on a broad and firm base. 它的重工业有广泛坚实的基础。
- He caught me off base with that question. 他的问题猝然把我给问倒了。
- The bombers swooped on the air base. 轰炸机突袭空军基地。
- Many languages have Latin as their base. 许多语言都以拉丁语为基础。
