问题 填空题 案例分析题

如图表示细胞内蛋白质合成后的去向和定位,其中①~⑦表示细胞结构,甲~丁表示结构中的物质。请据图回答:

①~⑦中,具有双层膜的是()(填序号),不含有磷脂分子的结构是()(填序号)。

答案

参考答案:⑤⑥⑦;①

解析:

分析图可知,①②③④⑤⑥⑦分别表示核糖体、内质网、高尔基体、细胞膜、细胞核、叶绿体、线粒体,其中具有双层膜的有线粒体、叶绿体和细胞核的核膜;生物膜的基本骨架为磷脂双分子层,而核糖体没有膜结构,它是由蛋白质和RNA组成的。

阅读理解

阅读理解。根据其内容回答问题。

     In almost every big university in the United States, football is a favorite sport. American football is

  different. Players sometimes kick (踢) the ball that is oval (not round), but they also throw the ball with

 their hands and run with it. They try to take it to the other end of the field. They have four chances to

 move the ball ten yards (长度单位,码). They can carry it or they can throw it. If they move the ball ten

 yards, they can try to move it another ten yards. If they move it to the end of the field, they receive six

 points (点,分). It is difficult to move the ball. Eleven men on the other team try to stop the man with the

 ball. If he does not move the ball ten yards, his team kicks the ball to the other team.

     Each university wants its own team to win. Many, many people come to watch. They all shout for their

 favorite team. Young men and women come on the field to help the people shout more. They dance and

 jump while they shout.

     Each team plays ten or eleven games each season. The season begins in September and ends in

 November. If a team is very good, it may play another game after the season ends. The best teams play

  again on January1, the first day of the New Year. Many people go to see these games and many others watch them on TV.

1. What does this passage (短文) talk about?

    _____________________

2. Do people in the United States like football very much?

    _____________________

3. How many players are there in an American football team?

    _____________________

4. Is it easy or difficult to move the ball?

    _____________________

5. What are the features (特点) of American football?

    _____________________

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