(1)答案是15
3个碱基对应1个氨基酸,那么信使RNA对应16个碱基,2分子氨基酸脱去一分子水,16-1=15,答案是15.
(2)答案是2/3
白化病是由常染色体隐性基因控制,所以可以得出父母都是Aa基因型.前提条件是女孩而且是正常的,所以根据基因分离比得到女孩的基因型可能是:AA和Aa.其中AA占1/3
Aa占2/3.所以答案就是2/3.
(3)选择C.
卵式生殖.因为只有这个是有性生殖,根据课本定义,得知有性生殖所产生的后代具有较大的生活力和变异性.详情见生物第一册100页.
(4)选择B.
呼吸作用是分解葡萄糖释放二氧化碳.
同化作用是指生物体把从外界环境中获取的营养物质转变为自身的组成物质,其过程可以认为等同于植物的光合作用,光和作用就是同化作用的一种.
蒸腾作用是将根吸收的水分通过气孔排出体外,其作用是产生蒸腾拉力,促进根部吸水.
(5)选择D.
海带中富含碘,其体内的碘的浓度是它所生存的水环境中的40倍,所以海带虽然有大的中央液泡,但对于碘的吸收,是主动运输.
(6)选择C.
单倍体是指细胞内染色体组数目是原细胞内染色体组数目的一半.所以单倍体小麦细胞中染色体组的数目为3组.
染色体组是指一组染色体内含有该种生物遗传所需要的全部基因,一个染色体组中的染色体就像数学中的集合一样,符合唯一性.那么一个细胞中有几组这样的染色体组就叫做几倍体~
所以单倍体小麦中的一个染色体组含有7个染色体.
(7)选择C
遗传密码是指信使RNA中相邻的3个碱基,信使RNA中只含有A,U,C,G,四种碱基,T碱基只存在于DNA中,所以选项C,错误.
(8)答案看不清楚.所以答案为:外祖母---母亲----男孩.
根据孟德尔遗传定律,男孩的色盲基因只可能来自母亲,而色盲是性X染色体隐性遗传病,所以他母亲的色盲基因不可能来自外祖父,只能来自外祖母.所以传递过程应该为:外祖母---母亲----男孩.
(9)选择D,
认真审题,发现题述过程符合孟德尔所做的遗传实验,画出遗传图解,发现白球和黄盘理论值应该相等,都为96棵,然后发现黄盘中的纯合体占1/3,所以纯合的黄盘有32棵.
(10),选择A.
酶在生物体的任何活细胞中都可以合成,
植物的根部合成生长激素,促进根的深长,所以根可以合成激素.
根部的伸长区细胞分裂旺盛,而核酸是细胞分裂必不可少的,所以根可以合成核酸,
而葡萄糖是光合作用的产物,根部没有叶绿素,一般见不到光,所以它不可能合成葡萄糖.
答案完全正确~
上海 英语试卷
(1999年上海) 英语试卷
一、语法 从下列各题的A、B、C、D四个选项中,选出一个最佳答案。
l. What a pity my new computer doesn’t work.______ must be something wrongwith it.(1999年上海)
A.It B.ThereC.This D.That
2.E-mail, as well as telephones, ______ an important part in daily communication.(1999年上海)
A.Is playing B.have playedC.are playing D.play
3.______ has hdped to save the drowning girl is worth praising.(1999年上海)
A.Who B.The oneC.Anyone D.Whoever
4.______ is mentioned above,the number of the students in senior high schools isincreasing.(1999年上海)
A.Which B.AsC.That D.It
5.It was ______ he said ______ disappointed me.
A.what … that B.that … thatC.what … what D. that … what
6.It is not rare in ______ that people in ______ fifties are going to university forfurther education.(1999年上海)
A.90s … the B.the 90s…C.90s…their D.the 90s…their
7. The director gave me a better offer than ______ .(1999年上海)
A.that of Dick’s B.Dick’sC.he gave Dick D. those of Dick
8.—— Let me tell you something about the journalists.
——Don’t you remember me the story yesterday?(1999年上海)
A.told B.tellingC.to tell D.to have told
9.______ your composition carefully, some spelling mistakes can be avoided.(1999年上海)
A.Having checked B. CheckC.If you check D. To check
10.______ everybody knows about it, I don’t want to talk any more.(1999年上海)
A. For B.EvenC. Since D.However
11. The number of the employees has grown from l,000 to l,200.This means it hasrisen ______ 20 percent.(1999年上海)
A.by B.atC.to D.with
12. Books of this kind ______ well.(1999年上海)
A.sell B.sell C.are sold D.is sold
13. One more week. ______ we will accomplish the task.(1999年上海)
A.or B.so thatC.and D.if
14. There was a lot of fun at yesterday’s party. You ______ come,but why didn’tyou?(1999年上海)
A.must have B.shouldC. need have D. ought to have
15.——It was careless of you to have left your clothes outside all night.
—— My God!______ .(1999年上海)
A. So did I B. So I didC.So were you D.So did you
16.He ______ to the lab than he set out to do the experiment.(1999年上海)
A. has no sooner got B.no sooner gotC. will no sooner getD. had no sooner got
17.There are five pairs ______.but I’m at a loss which to buy.(1999年上海)
A. to be chosen B. to choose fromC. to choose D.for choosing
18.——Mum, why do you a1Ways make me eat an egg every day?
——______ enough protein and nutrition as you are growing up.(1999年上海)
A.Get B.GettingC.To get D.To be getting
19. A computer does only what thinking people ______.(1999年上海)
A.have it do B. have it doneC. have done it D. having it done
20. The lady said she would buy a gift for her daughter with the ______.(1999年上海)
A. 20 dollars remainedB.20 dollars to remainC.remained 20 dollarsD.remaining 20 dollars
二、词汇 从下列各题的A、B、C、D四个选项中,选出一个最佳答案。
21. May I speak to Mr. Thomas, please?
——I’m afraid he isn’t in. Would you like to ______ a message?(1999年上海)
A.take B.write C.leave D.tell
22.The manager has ______ to improve the working conditions in the company.(1999年上海)
A.accepted B.allowedC.permitted D.agreed
23. Those T-shirts are usually $35 each, but today they have a ______ price of $19 inthe Shopping Center.(1999年上海)
A.regular B.specialC.cheap D.particular
24. We all know that ______ speak louder than words.(1999年上海)
A.movements B.performancesC.operations D.actions
25. My parents always let me have my own ______ of living.(1999年上海)
A.way B.methodC.manner D.fashion
26.______ with foreign countries can bring us much information about the world.(1999年上海)
A.Contrast B.CompetitionC.Contact D.Combination
27. Mother told Jim to ______ the milk until it boiled and then turn off the gas.(1999年上海)
A.observe B.watchC.notice D.glance
28. It is a good way for us to memorize new words by seeing them ______.(1999年上海)
A. properly B.repeatedlyC.clearly D.usually
29. The new law will come into ______ on the day it is passed.(1999年上海)
A.effect B.use C.service D.existence
30.Washington, a state in the United States, was named ______ one of the greatestAmerican presidents.(1999年上海)
A. in honour of B.instead ofC.in favour of D.by means of
三、语言功能 从下列各题的A、B、C、D四个选项中,选出一个最佳答案。
31.——My daughter has passed the exam.
—— Congratulations! She’s really intelligent.
——______(1999年上海)
A.No., no, she is nothing. B.Oh, thank you!C.Sometimes she is intelligent. D.You are right.
32.——Would you rathor come on Friday or Saturday?
——______(1999年上海)
A.Yes, of course. B.The other is better.
C.What’s the matter? D.Either would suit me.
33.——______.
——It’s nothing to worry about.Inever liked it anyway.(1999年上海)
A.I lost my Walkman this morning.
B.I feel awful.I’ye got a cold.
C.I feel terrible,but I’Ve left your tape somewhere.
D.I’m sorry, but we don’t have that medicine.
34.——You forgot to feed the cat again!
——______(1999年上海)
A.I can’t remember.B.I don’t mind feeding her again.
C.I’11 do it now D.Yes, I did. What about you?
35.——would you like to go to the Grand Theater with me tonight?
——______(1999年上海)
A.Yes, I would like to go to the Grand Theater with you tonight.
B.I’d love to, but I have an exam tomorrow.
C.No, I wouldn’t.
D.That’s all right.
36.——Jane: Tom, let me introduce you to Lucy.
——Tom:______
——Lucy:Hi, I’m Lucy Lee.(1999年上海)
A.What’s your name? B.Hello. C.Nice to see you. D.Sorry, not right now.
37.——Mum, I’ve cut my finger. It’s bleeding!
——______(1999年上海)
A.Let me see. B.Don’t worry.C.Be careful. D.Let me have a look.
38.——What’s happened to my library books?
——______(1999年上海)
A.I’ve no idea.B.You borrowed them from the library.
C.You bought them yesterday.D.They’re about long life.
39.—— My children are always arguing.
——______(1999年上海)
A.Just ignore them. B.that’s right. C.Are you sure? D.How old is the boy?
40.—— Where is Tom this morning?
——He’s got a cold.
——______(1999年上海)
A.Just tell him to take it easy.B.What’s the matter with him?
C.He is absent.D.What?Where is he?
1999年全国普通高等学校招生统一考试上海英语试卷答案及评分标准
第一至第四大题,每小题1分。
1.B 2.A 3.D 4.B 5.A 6.D 7.C 8.B 9.C 10.C 11.A 12.A 13.C 14.D 15.B 16.D 17.B 18.C 19.A 20.D 21.C 22.D 23.B 24.D 25.A 26.C 27.B 28.B 29.A 30.A 31.B 32.D 33.C 34.C 35.B 36.B 37.D 38.A 39.A 40.A