修饰碱基
参考答案:
除通常在DNA(T、C、G、A.和RNA(U、C、G、A.四种碱基以外的碱基,通常是在核酸合成后发生改变。
王大妈买回400克冬虫夏草,分装在小袋里.如果每小袋装30克.至少要准备多少个小袋?(得数保留整数)
— Was she badly hurt?
— Yes, each time she moved her leg, she ________ a cry.[ ]
A. broke out
B. tried out
C. let out
D. kept out