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【单选题】
原核生物蛋白质合成的30S起动复合体，组成成分是（）。A.
甲酰蛋氨酰tRNA，IF1，ATP
B.
甲酰蛋氨酰tRNA，IF2，GTP
C.
蛋氨酰tRNA，IF3，GTP
D.
甲酰蛋氨酰tRNA，IF2，ATP
E.
甲酰蛋氨酰tRNA，IF1，GTP
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