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(1)在基因工程的操作中,“分子手术刀”是 。?
(2)“分子缝合针”是 。?
(3)“分子运输车”是 。?
(4)操作步骤:获取目的基因;构建基因表达载体;在基因表达载体的组成中,除了目的基因外,还必须有 、 和 等。然后把基因表达载体导入牛的 ,通过发育形成的牛体细胞中都含人的 ,成熟的牛产的奶中含有 ,证明基因操作成功。? 查看习题详情和答案>>
Mr. Jones works in a factory far away from his home. One day he wanted to send a letter to his wife, but he could neither read nor write, and he had to work all day, so he could only look for somebody to write his letter late at night. At last he found the house of a letter-writer whose name was Nasreddin.
Nasreddin was already in bed. “It is late,” he said. “What do you want?” “I want you to write a letter to my wife,” said Mr. Jones. Nasreddin was not pleased. He thought for a few seconds and then asked, “Has the letter got to go far?”
“What does that matter?” answered Mr. Jones.
“Well, my writing is so strange that only I can read it, and if I have to travel a long way to read your letter to your wife, it will cost you a lot of money. ”Mr. Jones went away with no words.
1.Mr. Jones is a ________.
A. letter-writer B. postman C. worker
2.Mr. Jones looked for somebody to write a letter for him ______.
A. late at night
B. in the morning
C. in the afternoon
3.Nasreddin was not pleased because he wanted to ______.
A. write the letter B. make money C. remain in bed
4.We know from the story that Nasreddin is a _______ man.
A. kind B. funny C. strict
5.Which of the following statements is TRUE?
A. Mr. Jones paid no money to Nasreddin.
B. Mr. Jones was happy when he heard the words.
C. Nasreddin wrote the letter for Mr. Jones.
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(1)在培育转人生长激素基因牛的过程中,①过程需要的工具酶是 ,
②过程常用的方法是________。③过程培养到 阶段,可以采用________技术,培育出多头相同的转基因犊牛。
(2)在抗虫棉培育过程中,④过程中的受体细胞采用愈伤组织细胞与采用叶肉细胞相比较, 其优点是________________,⑤过程采用的技术是 ,该技术中,愈伤组织细胞可通过在液体培养基中形成单个胚性细胞,利用胚性细胞再分化形成的_____________可制成人工种子或发育成植株。但连续传代培养后,胚性细胞全性可能降低,从细胞内部看,主要原因是传代过程中发生_____________ 等变化。 查看习题详情和答案>>
(1)在基因工程的操作中,“分子手术刀”是 。?
(2)“分子缝合针”是 。?
(3)“分子运输车”是 。?
(4)操作步骤:获取目的基因;构建基因表达载体;在基因表达载体的组成中,除了目的基因外,还必须有 、 和 等。然后把基因表达载体导入牛的 ,通过发育形成的牛体细胞中都含人的 ,成熟的牛产的奶中含有 ,证明基因操作成功。? 查看习题详情和答案>>
(1)应用胚胎工程技术可以培育出“试管牛”。试管牛的培育需经过体外受精、 、
以及在母体中发育和产出等过程。
(2)在“试管牛”的培育过程中,要使精子和卵母细胞在体外成功结合,需要对精子进行处理,使其 。另外,培养的卵母细胞需要发育至减数第二次分裂的中期,该时期在显微镜下可观察到次级卵母细胞和 。
(3)通常奶牛每次排出一枚卵母细胞,采用激素处理可使其一次排出多枚卵母细胞,常使用的激素是 。
(4)利用基因工程可以获得转基因牛,从而改良奶牛的某些性状。基因工程的四个基本操作步骤是 、基因表达载体的构建、 和 。若要获得的转基因牛分泌的乳汁中含有人干扰素,则所构建的基因表达载体必须包括:某种牛乳腺分泌蛋白基因及其启动子、 、 、 和复制原点等。将该基因表达载体导入受体细胞所采用的方法是 (显微注射法、农杆菌转化法),为获得能大量产生人干扰素的转基因牛,该基因表达载体应导入的受体细胞是 (受精卵、乳腺细胞)。 查看习题详情和答案>>