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Câu 20. Một phân tử mARN gồm 32 bộ ba có trình tự nucleotit như sau: 5’ AUG – UUU – XXX – GGG ... UAA 3’ Thứ tự bộ ba 1 2 3 4 32 Biết ngoài bộ ba UAA ở vị trí số 32 thì trên phân tử mARN trên không xuất hiện thêm bộ ba kết thúc nào khác. Phân tử mARN dịch mã có 5 ribôxom trượt qua 1 lần. Có bao nhiêu phát biểu sau đây là đúng. I. Số axit amin mà môi trường cung cấp cho quá trình dịch mã là 155 axit amin. II. Có tổng cộng 150 axit amin trong tất cả các phân tử protein được tạo ra. III. Phân tử mARN có chiều dài 32,64 nm. IV. Nguyên tắc bổ sung trong quá trình trên là A liên kết với U, G liên kết với X. A.1 B. 2 C.3 D. 4
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Read the text carefully, then do the tasks. From the 20th to the 21st century, there have been significant changes all over the world. Substantial differences are evident between the way we live today, and the way we lived a century ago. Vietnam is no exception although there are some facets of life that still resemble the way of life of the twentieth century. Living in Vietnam today differs greatly from the lifestyle of 100 years ago. People in the past mainly worked in agriculture whereas today there are significantly less people working in this sector of the economy. These days, by comparison, people are more likely to be employed in manufacturing and tourism than in the rice fields. Moreover, Vietnam, which was traditionally agrarian, is transforming into an entirely different country. While agriculture is still an important component of the Vietnamese economy, other enterprises are accounting for an increasing amount of economic activity. However, along with the differences, similarities also exist. The people of Vietnam have retained many of the characteristics of their forefathers. The Vietnamese people are as friendly today as they were in the past. This is best exemplified in the way they welcome foreigners to their unique country. Moreover, the resilience and determination of the people of Vietnam has not changed. The Vietnamese work collectively and happily towards the development of their country. A. Decide whether the following statements are true (T) or false (F). 1. A minority of countries around the world have experienced dramatic change in the previous century. 2. Vietnam is not as agrarian as it was in the past. 3. Vietnamese people nowadays are friendlier to foreigners than they used to be. 4. The differences between the lifestyles of yesterday and the lifestyles of today are not evident. 5. Some of the characteristics of Vietnamese people never change. 6. Vietnamese people are very resilient and determined. B. Answer the questions. 7. How have lifestyles changed for the last century? 8. What characteristics of Vietnamese people have not changed?

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