知识贝壳
知识贝壳
所属栏目：英汉双解生物技术与遗传工程
One of the four major bases found in nucleic acids. Adenine and guanine are purines; cytosine,thymine,and uracil are pyrimidines. These nitrogenous bases are a component of the basic building blocks of nucleic acids called nucleotides. Within the DNA doub ......（本文共 365 字 ） [阅读本文] >>