按顺序正确进行基因工程 步骤是 A 、DNA片段的取得(目的基因的分离和制备); B 、选择基因(目的基因); C 、外源DNA片段引入受体细胞; D 、目的基因表达; E 、DNA片段和载体的连接——重组体DNA
A.
ABCDE
B.
AEBCD
C.
AEDCB
D.
AECBD
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