题干

血液中的血红蛋白和肌肉中的肌动蛋白的结构和功能不同,下列解释最正确的(    )

A:两种蛋白质所含氨基酸的数目不同

B:两种蛋白质所含肽链的空间结构不同

C:两种蛋白质所含氨基酸的排列顺序不同

D:两种蛋白质所含氨基酸的种类、数目、排列顺序和肽链的空间结构都不同

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答案(点此获取答案解析)

D

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(2015·北京卷)                                                                          B

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    One day when I was 13, my family was working in the fields to clear away old brush when somehow the electric fence sparked(冒火星) and1a fire. We didn't see the fire2it had blocked the way to the only gate. I3to jump over the fence to safety but the fire was all around us. I could only watch in4as the flames continued to rise. Little did I know that my father had once been a(an)5and knew what to do.6with only a pump sprayer, buckets, and his boots, he7down to the nearby pond, filled the buckets and the sprayer, and began spraying the8while my older brother threw water with the buckets. Soon the wind9 however, and with the Fire Department too far away to arrive in time, my father began to stomp(踩灭) out the flames as he moved to the10 so that my family was able to move inch by inch toward the gate.11he arrived at the gate, he jumped into the truck, rolled up the windows, and drove12the fire. Then the fire was put out, and my mother was looking at my father with her13eyes.

    After that, my father began telling us about his days as a firelighter, and my brother and I became14 asking him what other jobs he had done before he15 Well, it turned out that he had done just about16except brain surgery!

    He had been in the military as a carpenter, carpet layer, and electrician, and had built B2 bombers before being poisoned in an accident that had17him to retire. My father has a blood disorder as a result of that18 but that hasn't stopped him from being a full-time electrician.

    To all those people whose fathers have worked in the military and in other dangerous jobs, be19of them, and remember that some day their20might save your life.