Tổng số liên kết hiđrô của gen là 1300, trong gen có nuclêôtit A = 20% tổng số nuclêôtit. 1. Xác định số nuclêôtit mỗi loại của gen. 2. Có bao nhiêu liên kết cộng hóa trị giữa các nuclêôtit trong gen. 3. Tính chiều dài của gen theo nanomet.

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Exercise II: Write questions for the underlined part. 1. John went to Vietnam in 2000. ........................................................................................................................................ 2. My mother is cooking in the kitchen at the moment. ........................................................................................................................................ 3. Yes, she does. She likes playing table tennis. ............................................................................................................................... 4. It takes him 20 minutes to go to school by bike. ........................................................................................................................................ 5. I received a letter from John last week. ........................................................................................................................................ 6. Minh usually goes fishing with his father on Sundays. ........................................................................................................................................ 8. Covid-19 is transmitted much more readily between humans than Sars. (how) ……………………………………………………………………………………………. 9. About 38,920 people in the USA died because of COVID-19. ……………………………………………………………………………………. 10. The coronavirus lasts on surfaces for a few hours or up to several days. …………………………………………………………………………………….. GIÚP MÌNH VS