问题 单项选择题

遗传学上将某种分子上决定一个氨基酸的三个相邻碱基称为“密码子”,含有密码子的某分子是()。

A.肽链

B.DNA

C.信使RNA

D.转运RNA

答案

参考答案:C

解析:密码子是mRNA分子上三个相邻的碱基,C正确。肽链是基因表达的结果,A错误。DNA中含有遗传信息,B错误。转运RNA是携带氨基酸的,D错误。密码子是mRNA分子上三个相邻的碱基,C正确。肽链是基因表达的结果,A错误。DNA中含有遗传信息,B错误。转运RNA是携带氨基酸的,D错误。

阅读理解

You are the collector in the gallery of your life. You collect. You might not mean to but you do. One out of three people collects tangible(有形的)things such as cats, photos and noisy toys.

There are among some 40 collections that are being shown at “The Museum Of”—the first of several new museums which, over the next two years, will exhibit the objects accumulated by unknown collectors. In doing so, they will promote a popular culture of museums, not what museums normally represent.

Some of the collections are fairly common—records, model houses. Others are strangely beautiful—branches that have fallen from tree, for example. But they all reveal (显露)a lot of things: ask someone what they collect and their answers will tell you who they are.

Other on the way include “The museum of Collectors” and “The Museum of Me.”These new ones, it is hoped, will build on the success of “The Museum Of.” The thinkers behind the project want to explore why people collect, and what it means to do so. They hope that visitors who may not have considered themselves collectors will begin to see they, too, collect.

Some collectors say they started or stopped making collections at important point: the beginning or end of adolescence—“it’s a growing-up thing; you stop when you grow up,”says one. Other painful times are mentioned, such as the end of a relationship. For time and life can seem so uncontrollable that a steady serial(顺序排列的)arrangement is comforting.

小题1:How will the new museums promote a popular culture of museums?

A.By collecting more tangible things.

B.By showing what ordinary people have collected.

C.By correcting what museums normally represent.

D.By accumulating 40 collections two years from now.小题2:What can be learned about collectors from their collections?

A.Who they are.

B.How old they are.

C.Where they were born.

D.Why they might not mean to collect.小题3:Which of the following is an aim of the new museums?

A.To help people sell their collections.

B.To encourage more people to collect.

C.To study the significance of collecting.

D.To find out why people visit museums.小题4:According to the last paragraph, people may stop collecting when they       

A.become adults

B.feel happy with life

C.are ready for a relationship

D.feel time to he uncontrollable

问答题