问题 选择题

下列关于细胞核是控制中心的说法中,错误的是(  )

A.细胞核中有遗传物质DNA

B.克隆羊“多莉”长相与提供细胞核的母羊十分相像

C.细胞中的DNA只存在于细胞核中

D.细胞核之所以为控制中心是因为其中的DNA有指导生物发育的全部信息

答案

A、DNA与蛋白质共同组成染色体,染色体存在于细胞分裂期,在细胞分裂间期或不分裂的细胞中存在染色质即染色质与染色体是存在不同时期的形态不同的同种物质,有相同的作用.DNA 不只存在于细胞核中,还在线粒体,叶绿体中有分布,而染色体只存在于细胞核中.DNA承载的基因即遗传信息.A不符合题意;

B、克隆羊“多莉”长相与提供细胞核的母羊十分相像,B不符合题意;

C、生物体的遗传信息全部存在于细胞核内的说法是错误的,C符合题意;

D、细胞核之所以为控制中心是因为其中的DNA有指导生物发育的全部信息,不符合题意.

故选:C.

阅读理解

Visitors worry that London is an expensive city but there really are so many things to do for

free in London from museums and galleries to free music and walking tours.

Art Galleries

Tate Modern and Tate Britain are exceptional national art galleries housing some of the finest artworks in the world. Tate Modern focuses on contemporary art while Tate Britain displays British Art from the sixteenth century to the present day.

Museums

All of London's major museums are free, but most offer some special exhibitions for a fee. My favorite is the Museum of London where you can learn the history of London from Roman times to today. Other great major museums are the British Museum, the V&A, the Science Museum, and the      Natural History Museum. Oh, and I love the Geffrye Museum. And the. Now I can't decide which is the best!

Many of London's major art galleries and museums are open in the evening and often have special evening events. This can be a great way to relax at the end of a busy day seeing the sights. The main London galleries and museums are air-conditioned so it can be a wonderful way to cool down in the height of summer in the city. Galleries and museums are not open late every night so here is a handy list to help you plan your days and evenings.

Royal Parks

Many people say the Queen Mary's Rose Gardens in Regent's Park is their favorite spot in London, and who am I to argue? I would also recommend St. James's Park as it offers one of the best views of Buckingham Palace. Hyde Park is enormous and includes the ever popular Diana Memorial Fountain and the Peter Pan Statue.

There are often free talks and guided walks in the royal parks so do check the What's On section of the Royal Parks website.

Changing of the Guard

No visit to London is complete without seeing this military tradition. The Queen's Guard in London changes in the Forecourt inside the gates of Buckingham Palace at 11:30am every day in the summer and every other day in the winter. Get there early and view the spectacle from outside the front gates.

53. The passage is intended to _________.

A. recommend some free scenic spots to tourists       

B. help visitors save money while visiting Ireland

C. advise travelers how to choose art articles      D. tell readers London’s wonderful history

54. If you visit some museums in London in the evening, you ________.

A. can see all the artworks free of charge               B. have to endure the heat of the summer

C. need to pay admission for general exhibition  

D. may have a chance to enjoy some special events

55. In order to watch Changing of the Guard in summer, visitors have to _________.

A. gain access to the front gates after 11:30 a.m.

B. pay a sum of money to enter the Royal Parks

C. arrive at Buckingham Palace before 11:30 a.m.

D. come through the gates of Buchingham Palace

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