Công thức oxit cao nhất tương ứng 

Hợp chất khí với hidro tương ứng 

a)

N = 2280 nu

=> A =T= 2280.20% = 456 nu

=> G =X=684 nu

Sau đột biến , số lượng từng loại nu : 

A không đổi =>G =X=(H - 2A) : 3 = (2820 - 2.456):3 = 636 nu 

=> Số lượng từng loại mtcc cho các nu sau đột biến là : 

A =T =  (2² - 1) . 456 = 1368 nu

G = X= (2² -1).636 = 1908 nu

b) Sau đột biến, nhân đôi 2 lần ta có số gen con = 2² = 4, mỗi gen con phiên mã 3 lần
=> số mARN = 4.3 = 12, mỗi mARN có 1092 nu
=> số ribonu môi trường cung cấp = 

c) Mỗi mARN cho 6 riboxom trượt qua 1 lần
=> số chuỗi polypeptit tạo ra = 12.6 = 72, mỗi chuỗi polypeptit có số a.a =  => số a.a môi trường cung cấp = 363.72 = 26136.

OKK

1. What you (do) would you have done if I hadn’t lend you the money?

2. If you had asked me for ticket, I (get) would have got you some tickets.

3. I (not marry) wouldn't have married him If I had known what he was like.

4. I wouldn’t have hired a car if I (know) had known how expensive it was.

5. If we (go) had gone to the cinema earlier, we wouldn’t have missed the start of the film.

6. If I had been born a year earlier, I (have) would have had to do military service.

7. If you (ask) had asked me , I would have lend you my car.

8. If I had gone to university, I (get) would have got a better job.

9. I (not go) wouldn't have gone out yesterday , If you had asked me not to.

10. I could have given you a lift if my car (not break) hadn't broken down.

11. I (not go) wouldn't have gone to Britain if I had known what was going to happen.

12. I would have stay longer if he( want) had wanted me to.

13. I (not come) wouldn't have come to this school if I had known it was like.

14. We would have gone to his party if we had been able to find a baby – sister.

15. . I (visit ) would have visted you in the hospital if I had known you were there

OK

phần a còn cường độ dòng điện qua mỗi điện trở nữa

tự làm nha.OK

bạn bị làm sao đấy

cop đâu

9 A

10 B

11 B

12 A

13 B

14 A

15 D

16 C

Đến 33 mk lm ở dưới r

34 The doctor advised him to relax after a hard working week

35 Unless he takes these pills, he won't be better

36 A new mall has been built near my neighborhood recently