Một gen có tổng số 160 chu kì xoắn. Trên mạch 1 của gen có số nucleotit loại C=2G, có A=G, có T=2C. Gen có bao nhiêu liên kết hidro ?

Một gen có tổng số 120 chu kì xoắn. Trên mạch 1 của gen có số nucleotit loại A=2T, có G=2A, có T=2C. Gen có bao nhiêu liên kết hidro ?

Bài 2: Chuyển các câu sau sang bị động

11. Have you sent the chrisrmas cards to your family

12. The committee appointed Alice secretary for the meeting

13. He hides the broken cup in the drawer 

14. They keep this room tidy all the time

15. They all voted the party a great success

16. We gave Ann some bananas and some flowers

17. They moved the fridge into the living room 

18. She bought some cups of tea to the visitors in the next room

19. The find the new project worthless

20. The secretary didn't take the note to the manager 

Bài 2: Chuyển các câu sau sang bị động

1. The waiter brings me this dish 

2. Our friends send these postcards to us

3. Their grandmother told them this story when they visited her last week

4. Tim ordered this train ticket for his mother

5. You didn't show me the special camaras

6. She showed her ticket to the airline agent

7. He lends his friend his new shose

8. She left her relatives five million pounds

9. The shop assistant handed these boxes to the customer

10. The board awarded the first prize to the reporter

Bài 1: Chuyển các câu sau sang bị động

11. The Greman didn't build this factory during the Second World War

12. The Greens are going to paint this house and these cars for Christmas Day

13. Ann had fed the cats before she went to the cinema

14. The students have discussed the pollution problems since last week

15. Have the thieves stolen the most valuable painting in the national museum ?

16. Some people will interview the new president on TV

17. How many languages do they speak in Canada ?

18. Are you going to repair those shoes ?

19. He has broken his nose in a football match

20. Have you finished the above sentences ?

Bài 1: Chuyển các câu sau sang bị động

1. My father waters this flower every morning

2. John invited Fiona to his birthday party last night

3. Her mother is preparing the dinner in the kitchen

4. We should clean our teeth twice a day

5. Our teachers have explained the English grammar

6. Some drunk drivers caused the accident in this city 

7. Tom will visit his parents next month

8. The manager didn't phone the secretary this morning 

9. Did Mary make this beautiful dress ?

10, I won't hang these old pictures in the living room

Một ADN có chiều dài bằng 5100 A°. Tính tổng N và chu kì xoắn

Mẹ Lan mua 1 quả dưa hấu ruột vàng. Tại sao, khi lấy hạt trồng xong thì khi bổ ra lại thành ruột đỏ

TEST 2

IV. LANGUAGE FOCUS

Each line of the folloeing passage has one error. For each line, find and underline the error and then write the correct (Mỗi dòng của đoạn văn sau đây có một lỗi. Đối với mỗi dòng, tìm và gạch chân lỗi, sau đó viết đúng)

1. My brother bought a laptop computers in the USA

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2. He paid $1.500 with it. The laptop is expensive

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3. but it's really great. It is made in Japan in 1999

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4. It has a color screen so it't easily on the eyes

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5. The computer have a battery so he can use it without

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6. electricity for eight hour. It he wants to send a fax,

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7.he can sends it clectronically

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8. He could connect the Internet, too. My brother

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9. plans to take his laptop on a airplane when he

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10. takes a vacation abroad. It is a very smallest

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11. computer, so he takes them everywhere with him

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TEST 2

III. Read the following passages and decide if the stamements are True (T) or Flase (F)

Machu Picchu is an ancient city in Peru. The construction of the city started in 1450. The city covers about 13 square kilometers. For centuries, the city was buried in the jungle and was not discovered until 1911. Today, Machu Picchu is one of the most famous tourist attractions in all parts of South America.The Great Wall of China is the longest man-made structure ever built. Much of what exists of the wall today was built during the Ming dynasty in the late 1400s, although parts of the wall are much older and go back to around 200 B.C. The wall is about 11 meters high. The main part of the wall stretches for about 3,400 kilometers.
1. Machu Picchu is a modern city in Peru.

2. People began to build the city in 1450.

3. The city was built on the area of thirty square kilometers.

4. People found the city buried in the jungle in 1911.

5. The city is attractive to many tourists from South America.

6. The Great Wall of China was constructed by man.

7. The wall was built during the Ming dynasty in 1400.

8. Many parts of the wall were built around 200 B.C.

9. The wall is about 11 meters high.

10. The main part of the wall is about 3,400 kilometers long