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【判断题】
103 植物愈伤组织的建立和增殖需要在培养基中添加2,4-D。
A.
正确
B.
错误
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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】电梯封闭式井道内应设置照明,井道最高与最低处各装设一灯外,中间灯距不超过()m。
A.
7
B.
8
C.
9
D.
10
【简答题】品类创新是从竞争源头创造竞争,创造对持的局面。()
【简答题】conjugation between two or more chromophores tends to cause shifts in absorption maxima to ________________________.
【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
【单选题】The transfer of a naked fragment of DNA between bacteria is called
A.
conjugation
B.
transformation
C.
transduction
【判断题】三极管放大电路的本质是对能量的控制与转换。
A.
正确
B.
错误
【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( )
【判断题】品类创新是从竞争源头创造竞争,创造对持的局面。
A.
正确
B.
错误
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