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【单选题】
Transformation is important in bacterial pathogenicity becauseA.
it allows uptake of DNA that can homologously recombine into the bacterial chromosome and change virulence characteristics
B.
it kills recipient cells and prevents future cell invasion
C.
it enhances site-specific recombination that turns on virulence factor genes
D.
it causes transpositions to occur at high frequency that can kill virulent bacteria
E.
none of the above
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【单选题】刚地弓形虫寄生于人体的 ( ) A. 红细胞 B. 有核细胞 C. 淋巴液 D. 脑脊液 E. 血清
A.
红细胞
B.
有核细胞
C.
淋巴液
D.
脑脊液
E.
血清
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