腺嘌呤

例句：

1. 1. DNA is composed of nucleotides, including adenine and thymine.
   DNA由核苷酸组成，包括腺嘌呤和胸腺嘧啶。
2. 2. The structure of DNA contains the bases adenine, guanine, and cytosine.
   DNA的结构包含腺嘌呤、鸟嘌呤和胞嘧啶。
3. 3. Adenine is an essential nutrient for humans and many other organisms.
   腺嘌呤是人类和其他许多生物体必需的营养素。