A:DNA和RNA都能携带遗传信息
B:DNA和RNA的基本单位都是核苷酸
C:DNA只分布在细胞核内,RNA只分布在细胞质中
D:豌豆叶肉细胞内的核酸含有5种碱基
I've not seen him for a long time. He becomes stronger and more polite .