问题 填空题

现代生物技术在现代人类生活中日益体现出重要性和巨大的潜力,据报道,美国科学家率先培育出了能产生狂犬病病毒抗体的转基因烟草。实验表明,用转基因烟草提取的狂犬病病毒抗体的功能与人体天然产生的差不多,甚至更强。注射了这种抗体的实验动物能免受狂犬病的感染,且不产生过敏反应。请回答下列有关的问题:

(1)引起人体产生狂犬病病毒抗体的抗原是______,人体能产生狂犬病病毒抗体的细胞是______细胞。

(2)农业上采用基因工程技术改良玉米的品质时,可选用大豆种子贮藏蛋白基因为目的基因。该目的基因与作为______的质粒组装成为重组DNA分子时,需要用到______酶和_______酶。为便于筛选获得了目的基因的受体细胞,所用的质粒通常具有_________。将目的基因导入离体的玉米体细胞的细胞质后,需要采用________技术进行培养才能获得具有目的基因的玉米植株。

(3)若已获得了转基因玉米植株,欲通过杂交来产生子代扩大种植面,则该转基因植株宜作____(填“父本”或“母本”),原因是________________。

答案

(1)狂犬病病毒素    效应B

(2)运载体   限制性内切   DNA连接   标记基因   植物组织培养

(3)母本    质粒在细胞质中,为细胞质遗传,具有母系遗传的特点

完形填空
I didn’t have a job at the time and I was getting help from the government. One day, I was walking to a 36 to get some food when I noticed a little man    37  on a bench beside the store. I walked past him but could not 38     thinking about him.  So I 39 around and went up to him and asked him if he was 40 . He said no. He said he hadn’t 41 for two days. I told him, “Don’t    42 . I’ll be right back.” Before leaving, I 43  him what he would like to eat. He said it didn’t 44 . Then I asked him to tell me what he hadn’t had for a long    45 . He said “a Pepsi”. I went into the store and got him some bread, lunch meat, chips, cookies — 46 food for a few days. The store didn’t have Pepsi, 47     I had to go to another one. I used the 48  of what I had to get him a Pepsi from a store far 49 .
After a long time, when I brought him the 50 and the Pepsi, he cried. With    51  in his eyes, he said, “You are my angel.” When he 52 to hug me, I had a strange 53 — he was my angel, too. I couldn’t even 54  the feeling clearly. Maybe because he gave me a / an 55  to help him, which helped me to understand that I also had abilities to help others.
小题1:
A.storeB.company C.restaurantD.hotel
小题2:
A.workingB.sittingC.standingD.drinking
小题3:
A.waitB.beginC.forgetD.stop
小题4:
A.lookedB.facedC.turnedD.played
小题5:
A.lonelyB.hungryC.tiredD.okay
小题6:
A.eatenB.restedC.sleptD.walked
小题7:
A.moveB.worryC.refuseD.lie
小题8:
A.toldB.wonderedC.askedD.advised
小题9:
A.careB.knowC.concernD.matter
小题10:
A.wayB.pathC.timeD.season
小题11:
A.enoughB.manyC.few D.little
小题12:
A.forB.butC.asD.so
小题13:
A.nextB.lastC.first D.large
小题14:
A.overB.awayC.offD.near
小题15:
A.lunchB.dishC.foodD.supper
小题16:
A.angerB.excitementC.smilesD.tears
小题17:
A.sat downB.passed onC.stood upD.picked up
小题18:
A.wayB.opinionC.attitudeD.feeling
小题19:
A.explainB.introduceC.repeatD.remember
小题20:
A.incidentB.opportunityC.choiceD.method
单项选择题