GIúp Mình Bài Này Với Mọi Người Một gen dài 4080A0 , có 30% Ađenin. Trên mạch thứ nhất có 350 Timin, trên mạch thứ hai có 200 Xitôzin. Hãy xác định: Số liên kết hidro giữa 2 mạch của gen? Số lượng từng loại nuclêôtit của mỗi mạch đơn?

2 câu trả lời

Tổng số Nu của gen là:

$\text{N=$\dfrac{\text{2L}}{3,4}$=$\dfrac{2×4080}{3,4}$=2400 (Nu)}$

Số lượng từng loại Nu của gen là:

$\text{A=T=2400×30%=720 (Nu)}$

$\text{G=X=2400×(50%-30%)=480 (Nu)}$

Số liên kết hiđro giữa $2$ mạch của gen là:

$\text{H=2A+3G=2×720+3×480=2880 (Liên Kết)}$

Số lượng từng loại Nu của mỗi mạch đơn là:

$\text{T$_1$=A$_2$=350 (Nu)}$

$\text{A$_1$=T$_2$=A-A$_2$=720-350=370 (Nu)}$

$\text{X$_2$=G$_1$=200 (Nu)}$

$\text{G$_2$=X$_1$=G-G$_1$=480-200=280 (Nu)}$

- Tổng số `Nu` của gen là:

`4080 . 2 : 3,4 = 2400` `Nu`

- Số `Nu` mỗi loại của gen là:

· `A = T = 2400 . 30\% = 720` `Nu`

· `G = X = (2400 - 720.2) : 2 = 480` `Nu`

- Số liên kết Hiđrô giữa `2` mạch đơn của gen là:

`2.720 + 3.480 = 2880` liên kết Hiđrô

- Số `Nu` mỗi loại trên mỗi mạch đơn của gen là:

· `T_1 = A_2 = 350` `Nu`

· `A_1 = T_2 = 720 - 350 = 370` `Nu`

· `X_2 = G_1 = 200` `Nu`

· `G_2 = X_1 = 480 - 200 = 280` `Nu`

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Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the questions. It is often considered that the schoolyard is where bullies go to make other kids a miserable school life, but a new study suggests that classrooms are another popular place. The study, presented recently at the American Public Health Association's yearly meeting in Philadelphia, is based on the results of the research from more than 10,000 middle school students who answered questions online. Of those researched, 43% said they'd been physically bullied within the last month. A bit more than half said they had been laughed at in an unfriendly way, and half reported being called hurtful names. About one third said groups had excluded them to hurt their feelings. 28% said their belongings had been taken or broken; 21% said someone had threatened to hurt them. According to the results, two-thirds of the students said they had been bullied in more than one way over the previous month. The study authors mentioned that 8% of the students who answered said they had missed school at least once during the school year because of fear of being bullied. 25% said they had taken other actions, such as missing recess, not going to the bathroom or lunch, missing classes, or staying away from some area of the school to escape from experiencing a bully. Bullies did too much to the school life. 28. Bullies can happen in the following places EXCEPT_______. A. schoolyards B. classrooms C. bathrooms D. teachers' offices 29. The underlined phrase ‘‘laughed at” in the passage is closest in meaning to_______ A. made fun of B. smiled nicely C. shouted at D. looked after well 30. Which of the following might some students do to protect themselves from bullies? A. They miss school. B. They call their parents for help, C. They try to hurt others. D. They break others' belongings. 31. How does the writer feel about bullies at school? A. Excited B. Disappointed C. Worried D. Puzzled 32. Which of the following is probably the best title for the passage? A. Bad School Life B. Bullies at School C. Fear at School D. School Problems

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