皮皮学，免费搜题
登录
搜题
【简答题】
（1）已知 （x≠0，y≠0），求 的值。 （2）已知 ，求 的值。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
.
..
皮皮学刷刷变学霸
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
查看完整题目与答案
【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
查看完整题目与答案
【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.
查看完整题目与答案
【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
查看完整题目与答案
【单选题】The transfer of a naked fragment of DNA between bacteria is called
A.
conjugation
B.
transformation
C.
transduction
查看完整题目与答案
【简答题】灭菌后的无菌包有效期为____天。
查看完整题目与答案
【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.
查看完整题目与答案
【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( )
查看完整题目与答案
【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
查看完整题目与答案
【单选题】电梯封闭式井道内应设置照明,并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
查看完整题目与答案
相关题目：
【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
查看完整题目与答案
【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
查看完整题目与答案
【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.
查看完整题目与答案
【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
查看完整题目与答案
【单选题】The transfer of a naked fragment of DNA between bacteria is called
A.
conjugation
B.
transformation
C.
transduction
查看完整题目与答案
【简答题】灭菌后的无菌包有效期为____天。
查看完整题目与答案
【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.
查看完整题目与答案
【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( )
查看完整题目与答案
【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
查看完整题目与答案
【单选题】电梯封闭式井道内应设置照明,并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
查看完整题目与答案