红细胞起源于()
A.原始红细胞
B.肝脏
C.骨髓造血干细胞
D.巨噬细胞
E.早幼红细胞
参考答案:C
An idea suddenly came to J.K.Rolling ________ she could write a book about people living in the magic world
A.if
B.when
C.that
D.which
试述蛋白质合成过程中转录和翻译的主要过程。