
【名词&注释】
大肠杆菌(escherichia coli)、基因工程(genetic engineering)、鸭跖草(common dayflower)、限制性(restriction)、有利于(beneficial to)、DNA连接酶(dna ligase)、橡皮树(ficus elastica)、顶端优势(apical dominance)
[单选题]下列关于基因工程的叙述,错误的是
A. 目的基因和受体细胞均可来自动、植物或微生物
B. 限制性核算内切酶和DNA连接酶(dna ligase)是两类常用的工具酶
C. 人胰岛素原基因在大肠杆菌中表达的胰岛素原无生物活性
D. 载体上的抗性基因有利于筛选含重组DNA的细胞和促进目的基因的表达
查看答案&解析
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举一反三:
[单选题]How did Andy avoid the bees in the end?
A. He asked Mr. Nelson in help.
B. He hid himself under the water.
C. He rushed into the Nelson house.
D. He rode off in the oppossnte ditcction.
[单选题]忍冬科(Caprifoliaceae)植物花中花萼筒与子房贴生,意即子房下位。( )
A. 正确
B. 错误
[单选题]14 . What was Mrs. Franks doing when the accident took place?
A. Walking along Churchill Avenue.
B. Getting ready to cross the road.
C. Standing outside a bank.
[单选题]
A. split
B. spend
C. spare
D. save
[单选题]观察钟乳体的较好材料是( )。
A. 蚕豆叶片
B. 印度橡皮树(ficus elastica)叶片
C. 小麦叶片
D. 鸭跖草叶片
[单选题]移栽菜苗时,一般将根除掉一截,目的是除掉顶端优势(apical dominance),促进侧根的发生。( )
A. 正确
B. 错误
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