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【单选题】
运用现代生物技术的育种方法,将抗菜青虫的Bt基因转移到优质油菜中,培育出转基因抗虫的油菜品种。这一品种在生长过程中能产生特异的杀虫蛋白质,对菜青虫有显著抗性,能大大减轻菜青虫对油菜的危害,提高油菜产量,减少农药使用。下列相关叙述正确的是( )。A.
Bt基因的化学成分是蛋白质
B.
Bt基因中有菜青虫的遗传物质
C.
转基因抗虫油菜能产生杀虫蛋白是由于具有Bt基因
D.
转基因抗虫油菜产生的杀虫蛋白是无机物
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A.
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B.
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C.
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D.
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