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【单选题】
以下植物的茎的变态类型为块茎的是A.
甘薯
B.
半夏
C.
D.
慈菇
E.
百合
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举一反三
【单选题】Which of the following processes allow(s) the transfer of bacterial DNA between different individual cells?
A.
transformation
B.
conjugation
C.
generalized transduction
D.
all of the above
E.
none of the above
【单选题】Which of the following statements about genetic exchange in bacteria is NOT true?
A.
In conjugation there has to be a physical connection between the donor cell and the recipient cell.
B.
Plasmids do not have to integrate into the host cell chromosome in order to be replicated.
C.
Interrupted conjugation results in the production of Hfr strains.
D.
The order of gene transfer is not the same for different Hfr strains.
E.
Antibiotic resistance can be transferred from one bacterial cell to another by conjugation.
【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 gram-negative bacteria have a thin layer
B.
gram-positive bacteria have an outer lipid-rich membrane, whereas gram-negative 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
【简答题】灭菌后的无菌包有效期为____天。
【单选题】《尼伯龙根的指环》分为四夜,其顺序是:( )
A.
莱茵的黄金、女武神、齐格弗里德、诸神的黄昏
B.
女武神、莱茵的黄金、齐格弗里德、诸神的黄昏
C.
莱茵的黄金、齐格弗里德、女武神、诸神的黄昏
D.
莱茵的黄金、女武神、诸神的黄昏、齐格弗里德
【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.
【简答题】填写8位数商品编码: 汽车用调频条幅立体声收放音组合机( )
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