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⑴要使运载体与该抗病基因连接,首先应使用 进行切割。假如运载体被切割后,得到的分子末端序列为 ,则能与该运载体连接的抗病基因分子末端是 。
⑵基因的“针线”是 。切割完成并连接后得到的DNA分子称为 。
⑶该抗病基因在棉花细胞中表达的产物是
A.淀粉 | B.脂肪 | C.蛋白质 | D.核酸 |
⑴要使运载体与该抗病基因连接,首先应使用 进行切割。假如运载体被切割后,得到的分子末端序列为 ,则能与该运载体连接的抗病基因分子末端是 。
⑵基因的“针线”是 。切割完成并连接后得到的DNA分子称为 。
⑶该抗病基因在棉花细胞中表达的产物是
A.淀粉 | B.脂肪 | C.蛋白质 | D.核酸 |
阅读下面的短文,并根据短文内容判断文后句子的正误。正确的用(T),错误的用(F)。(共5小题,计10分)
???? He was a single father of a 5-year-old boy.He was often worried about his son growing up without a mother.
????? One day he went away on business and left the child alone.He was worried about the child all the way.He went home quickly after finishing his work.
????? When he got home,the child was asleep.He was very tired.Before going to bed,he was surprised to find an overturned(翻倒的)bowl of noodles under the quilt(床罩).
????? He beat his sleeping son angrily, “Why are you so naughty(淘气的),making the quilt dirty?Who will wash it?”It was the first time that he had hit his son after his wife’s death.
?????? “I haven’t,”the child explained with tears in his eyes.? “This is your supper,Daddy.”In order to let his father eat dinner as soon as he got home,the child cooked two bowls of noodles:one for himself,the other for his father.He put his father’s noodles under the quilt to keep them hot.
?????? Hearing this,the father hugged(拥抱)his boy tightly without saying a word.
1.The father worried about his son when he was on business.
2.The child was sleeping when his father got home.
3.The father often hit his son after his wife’s death.
4.The child cooked noodles for himself and his father.
5.The child put the noodles on the table.
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Most families buy a Christmas tree for their children. And there are some presents hanging from the tree here and there. People also put presents in children’s stockings. In many places, Father Christmas himself brings presents to them. He is a kind man and in red clothes. There is a big bag on his back. In it there are a lot of presents.
Christmas is also a day when people enjoy all kinds of food. But some poor people have no homes and have no food to eat. They die of cold and hunger(饥饿)on Christmas Day.
根据以上短文内容,请判断下列句子的正误,正确的用“T”,错误的用“F”。
小题1:Christmas is a very important day in some countries in a year.
小题2:Many people have a good time on Christmas Day.
小题3:Father Christmas wears red clothes.
小题4:There are a lot of Christmas trees in Father Christmas’bag.
小题5:Some poor people die on Christmas Day because they have no homes and no food to eat.