bai tap ve cau tao adn

... TTLTĐH Vĩnh Viễn GV : Nguyễn Thái Định . 2011 Trang 1 BÀI TẬP VE CẤU TRÚC ADN VÀ CƠ CHẾ TỔNG HỢP ADN Câu 1: Một mạch của gen có trình tự các nucleotit như sau 3 ′ …TATGGGXAT…5 ′ ... tử ADN ở sinh vật nhân thực có số nucleotit loại Ađênin chiếm 20% tổng số nucleotit .Tỷ lệ số nucleotit loại Guanin trong phân tử ADN này là A. 40% B. 20% C.30% D. 10% Câu 3 Một phân tử ADN ... trong phân tử ADN này là A. 45%. B. 35%. C. 25%. D. 15%. Câu 5 Trên một mạch của phân tử ADN có tỉ lệ các loại nuclêôtit là 2 1 XT GA . Tỷ lệ này ở mạch bổ sung của phân tử ADN nói trên...

Ngày tải lên: 18/03/2014, 13:21

Ngày tải lên: 12/08/2014, 18:21

Ngày tải lên: 19/09/2014, 14:58

... If………………………………………….……………………………………………… 42. I never got very lonely because I have lots of good friends. If…………………………………………………………………………………………… 43. We didn’t go on holiday because we didn’t have enough time. If…………………………………………………………………………………………… ... thanks to the night-watchman. > If it hadn’t 35.Dick is in prison because a detective recognized him. > If a detective 36. He doesn’t have the money and he cannot afford a new car. ... should + have + P II could [ Eg: 1. If I had gone there, I would have met him. 2. If she had had enough money, she would have bought that car. 3. If he had studied hard enough, he would have passed...

Ngày tải lên: 04/06/2013, 01:26

... (sum<=A) do Begin sum:= sum+1/i; i:= i+1; end; Write('Gia tri N thoa man dieu kien cua bai toan la: ', i:6); Readln; End. 14. Program P3114; USES crt; VAR a:array[1 41] of longint; n,i,j:...

Ngày tải lên: 07/06/2013, 01:25

... nhiờu? ã Gv hng dn cho HS ln lt v gi mt HS lên bảng trình bày lại thuật toán của bài này. -HS đọc bai tập 6 và trả lời câu hỏi ca GV. ã HS ghi bi vo. ã Bc 1. Gỏn A0, i1 ã Bc 2. A1/i(i+2) ã Bc 3. ... nêu ý kiến của mình. -HS đọc đề bài5 -HS lần lượt trả lời từng em một và có giải thích. -HS đọc bai tập 6 và trả lời câu hỏi của GV.HS ghi bài vào.HS đọc nội dung bài tập. Suy nghĩ rồi thực...

Ngày tải lên: 01/07/2013, 01:25

Ngày tải lên: 01/07/2013, 01:25

... didn't come with us…………………… 28 She'd have enjoyed it……………………… 29 They should have planned the expedition more carefully…………… 30 Lives were lost unnecessarily…………………. 31 She warned ... long………………………………… 22 She doesn't believe you…………………. 23 It didn't matter very much………………. 24 He shouldn't put so much salt in it……………………. 25 Mary couldn't leave the children alone……………… 26 ... That's him over there……………………. 10 George can leave his case here………………………. 11 This will fit in your pocket…………………… 12 His wife has headaches quite often………………… 13 She's got lovely blue eyes…………………...

Ngày tải lên: 04/08/2013, 01:26

... ……………………………………… 9. “Have you ever seen that film?”, he asked me He asked me…………………………… …………… 10. “ I went to Do Son last week”, she said She said………………………… …………… 11. “I never eat meat”, he explained ... said………………………… …………… 11. “I never eat meat”, he explained He explained ……………….…… ……………………… 12. “ I’ll never gat married,” Tom says Tom says…………………… ……………………………. 13. “If I were you, I would kept silent”,...

Ngày tải lên: 17/08/2013, 08:52

... police arrest the shoplifter. 11.Are you going to have the shoemaker repair your shoes? 12.I must have the dentist check my teeth. 13.She will have a veterinary surgeon examine her dog. 14.We had a ... week. 2.She will have Peter wash her car tomorrow. 3.They have her tell the story again. 4.John gets his sister to clean his shirt. 5.Anne had had a friend type her composition. 6.Rick will have a barber ... notifies all the workers that they will have to work extra hard this month. 10.They have persuaded me that they will go with me to the stadium. 11.They have decided that the company will go to the...

Ngày tải lên: 19/08/2013, 14:47

Ngày tải lên: 19/08/2013, 14:47

... They had only lived in that house for three years when fire destroyed it ( two passives). →……………………………………………………………………………………………… →……………………………………………………………………………………………… 25. I should love somebody ... do. →……………………………………………………………………………………………… 27. Did nobody ever teach you how to behave? →……………………………………………………………………………………………… 28. It surprised me to hear someone had robbed you. (two passives). →……………………………………………………………………………………………… ... passives). →……………………………………………………………………………………………… →……………………………………………………………………………………………… 30. It must have disappointed him terribly that people told him they didn’t want him. ( three passives). →………………………………………………………………………………………………...

Ngày tải lên: 21/08/2013, 15:10

... long………………………………… 22 She doesn't believe you…………………. 23 It didn't matter very much………………. 24 He shouldn't put so much salt in it……………………. 25 Mary couldn't leave the children alone……………… 26 ... That's him over there……………………. 10 George can leave his case here………………………. 11 This will fit in your pocket…………………… 12 His wife has headaches quite often………………… 13 She's got lovely blue eyes………………… ... nobody, hardly/hardly any etc. is treated as a negative statement: He hardly ever makes a mistake, does he? When the subject is nobody/anybody/everybody etc., the pronoun they is used in the tag: ...

Ngày tải lên: 09/09/2013, 13:10

... have time to play regularly?” he said to Hong. ……………………………………………………………………………………… 8 . “ You work very hard.” My mother said to me. ……………………………………………………………………………………… 9 . “ We have a lift but very ... VII Change these sentences into indirect speech 1. “ We are very tired.” they said. ……………………………………………………………………………………… 2. “ I am going to your house” He said ... you hungry, Margaret?” Mary said. ……………………………………………………………………………………… 13. “ Do you go to school every day?” he said to Thao. ……………………………………………………………………………………… 14. “ Can you answer this question?”...

Ngày tải lên: 27/09/2013, 19:10

... _______ more carefully, she might not have made too many mistakes. 16/ You would have to stay in bed unless your health (improve) _______. 17/ If I (have) ________ a typewriter, I could type ... well. 12/ If I became very rich, I (build ) _______ a hospital for the poor. 13/ If he (give) _______ up smoking, as his doctor orders, he will be soon well again. 14/ He (not, have) _______ an accident ... regularly. 4/ If I (know) ________ his telephone number, I would give it to you. 5/ If you (arrive) ________ ten minutes earlier, you would have got a seat. 6/ If he (study) ________ harder, he can pass...

Ngày tải lên: 28/09/2013, 20:10

... very beautiful. I saw her at school yesterday. A. This girl which I saw at school yesterday is very beautiful. B. This girl whom I saw at school yesterday is very beautiful. C. This girl is very ... a present .Thank you very much for it. a. You sent me a present which thank you very much for it. b. Thank you very much for a present which you sent me. c. Thank you very much for the present, ... reason. 10.The restaurant serves good food with reasonable prices. We often have lunch there. III. Choose the best option 1. Can I borrow your car for this evening? – Sure, but Nora’s using...

Ngày tải lên: 14/10/2013, 02:11

Ngày tải lên: 19/12/2013, 08:59

Ngày tải lên: 22/12/2013, 21:21

Ngày tải lên: 04/03/2014, 20:47

... (like/star/begin ) Active Passive Verb + to V-inf Verb + to be + V-3/ed Verb + V-ing Verb + being + V-3/ed Verb + to have + V-3/ed Verb + to have been + V-3/ed Verb + having + V-3/ed Verb + having been ... wine is drink by them. 15. They belived that he saved me A. It was belived that he saved me C. He was belived to have saved me B. It was belived that he has saved me. D. A and C are correct. I. ... The police have arrested five suspects 45. Kerrie has paid the bill. 46. I have eaten a hamburger. 47. I have opened the present 48. They have not read the book. 49. You have not sent the...

Ngày tải lên: 15/04/2014, 16:17