试题与答案

如图表示某DNA片段遗传信息的传递过程,①~⑤表示物质或结构,a、b、c表示生理

题型:读图填空题

题目:

如图表示某DNA片段遗传信息的传递过程,①~⑤表示物质或结构,a、b、c表示生理过程。请据图回答下列问题:(可能用到的密码子:AUG—甲硫氨酸、GCU—丙氨酸、AAG—赖氨酸、UUC—苯丙氨酸、UCU—丝氨酸、UAC—酪氨酸)

(1)完成遗传信息表达的是___________(填字母)过程;b过程所需的酶主要有_____________。

(2)图中含有核糖的是__________(填数字);由②指导合成的多肽链中氨基酸序列是___________。

(3)该DNA片段中胸腺嘧啶脱氧核苷酸的数目为__________个。

(4)从化学成分角度分析,与③结构的化学组成最相似的是_____。

A.乳酸杆菌  B.噬菌体  C.染色体  D.流感病毒

(5)苯丙酮尿症是由控制某种酶的基因异常而引起的,这说明基因和性状的关系是__________。

(6)1978年,美国科学家将人类胰岛素基因拼接到大肠杆菌的DNA中,通过大肠杆菌的繁殖,生产出人类的胰岛素。人的胰岛素基因能在大肠杆菌细胞中表达其所携带的遗传信息,说明生物共用一套相同的___________。胰岛素基因拼接到大肠杆菌的DNA中,其遗传信息的表达过程可表示为:________________

答案:

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参考答案:A

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题型:阅读理解

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     In 1982 Steven Callahan was crossing the Atlantic alone in his sailboat when it struck something and

sank. He was out of the shipping lanes and floating in a life raft, alone. His supplies were few. His chances were small. Yet when three fishermen found him seventy-six days later, he was alive.

     His account of how he survived is fascinating. But the thing that caught my eye was how he managed

to keep himself going when all hope seemed lost. Giving up would have seemed the only wise option.

     When people survive these kinds of circumstances, they do something with their minds that gives them

the courage to keep going. Many people in similarly desperate circumstances give in or go mad.

     "I tell myself I can handle it," wrote Callahan. "Compared to what others have been through, I'm

fortunate. I tell myself these things over and over, building up fortitude(坚强意志)…."

     It struck me as something important. And I've told myself the same thing when my own goals seemed

far off or when my problems seemed too overwhelming. And every time I've said it, I have always come

back to my senses.

      The truth is, our circumstances are only bad compared to something better. But others have been

through much worse. So here, coming to us from the extreme edge of survival, are words that can give us

strength. Whatever you're going through, tell yourself you can handle it. Tell this to yourself over and over, and it will help you get through the rough spots with a little more fortitude.

1. The writer seemed more interested in ______.

A. something that made Steven Callahan want to cross the Atlantic

B. What made Steven Callahan live through the circumstances

C. what Steven Callahan thought of in the ban circumstances

D. what was wrong with his boat on the half way

2. From the third paragraph we can infer that ______.

A. the state of mind means one's life or death

B. keeping up one's spirit is especially easy for one

C. most people have good physiological quality

D. bad conditions can strengthen one's will

3. How did Steven Callahan build up his confidence in difficulty?

A. By comparing himself with others.

B. By trying over and over again to call help.

C. By encouraging himself once and again.

D. By trying out different ways of how to survive.

4. What did the writer get from the experience of Steven Callahan?

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B. Encouragement comes from one's behaviors.

C. The strength of example is endless.

D. To experience the difficulty does good to one person.

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