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【单选题】
Which one of the following is the most accurate description of the structural differences between gram-positive bacteria and gram-negative bacteria?A.
Gram-positive bacteria have a thick peptidoglycan layer whereas gramnegative bacteria have a thin layer.
B.
Gram-positive bacteria have an outer lipid-rich membrane whereas gramnegative bacteria do not.
C.
Gram-positive bacteria form a sex pilus that mediates conjugation whereas gram-negative bacteria do not.
D.
Gram-positive bacteria have plasmids whereas gram-negative bacteria do not.
E.
Gram-positive bacteria have capsules whereas gram-negative bacteria do not.
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反馈参考答案：
举一反三
【单选题】Wo wohnt Christine? - ( ) .
A.
Aus D ü sseldorf
B.
In D ü sseldorf
C.
Im D ü sseldorf
【单选题】- ________ wohnt Herr Pan? - ______ wohnt in Jingyue.
A.
Wo, Sie
B.
Wo, Er
C.
Wie, Er
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