| 1. | The purine and pyrimidine may be complexed with a sugar to produce a nucleoside .
嘌呤和嘧啶可以同一个糖复合，产生一个核苷。 |
| 2. | The substitution of a purine for a pyrimidine, or vice versa is a transversion .
嘌呤为嘧啶取代或嘧啶为嘌呤所取代，叫做颠换。 |
| 3. | In other words, replacement of the number 8 carbon by nitrogen in the purine ring does not eliminate activity .
换句话说，嘌呤环上第8位碳被氮所取代并不丧失活性。 |
| 4. | In dna, four different bases are found. two of these, adenine and guanine, are double-ring structures called purines .
在DNA中，有四种不同的基，其中的两个为腺嘌呤和鸟嘌呤，即称为嘌呤的双环结构。 |
| 5. | In dna, four different bases are found. two of these, adenine and guanine, are double-ring structures called purines .
在DNA中，有四种不同的碱基，其中的两个为腺嘌呤和鸟嘌呤，即称为嘌呤的双环结构。 |
| 6. | Adenine has a purine ring structure
腺嘌呤具有嘌呤环的结构。 |
| 7. | Adenine a nitrogenous base ( 6 - amino - purine ) found in dna and rna
腺嘌呤：在dna和rna中发现的含氮的碱基（ 6氨基嘌呤） 。 |
| 8. | The ability of different adsorbents to absorb purine compounds in beer was studied
摘要初步研究了多种吸附剂对啤酒中嘌呤类物质的吸附能力。 |
| 9. | Glycine is necessary for the synthesis of purines , and is a basic compoent of porphyrins
甘氨酸在嘌呤的合成中是必不可少的，也是卟啉的基本组成。 |
| 10. | A purine - sensitive signaling pathway controls axon regeneration in goldfish retinal ganglion cells
族维生素对体外培养大鼠视网膜神经细胞及节细胞的神经营养作用 |
