Một tế bào sinh dưỡng có 2n = 24 tiến hành 5 lần nguyên phân liên tiếp. Tính a. Số tế bào con được tạo ra khi kết thúc quá trình là? b. Số NST môi trường cung cấp cho quá trình nhân đôi? c. Số thoi vô sắc hình thành, phá hủy trong toàn bộ quá trình nhân đôi.

Các câu hỏi liên quan

minh hua xe voye 5 sao 1 Choose the correct sentence made from the given words. Question 24. famous/Sydney Opera House/serve as/arts centre/1973/. A: The famous Sydney Opera House has served as an arts centre since 1973. B: The famous Sydney Opera House served as an arts centre since 1973. C: The famous Sydney Opera House has served as an arts centre in 1973. D: The famous Sydney Opera House was served as an arts centre in 1973. 2 Choose the best answer A, B, C or D to complete the sentence. Question 12. The USA is _________ 50 states. A: made up B: made up from C: made up of D: made in for 3 Choose the best answer A, B, C or D to complete the sentence. Question 7. Niagara Falls is a great _________ on the border of the USA and Canada. Thousands of visitors come to see it every month. A: culture B: relaxation C: spectacle D: tradition 4 Choose the best answer A, B, C or D to complete the sentence. Question 11. America ________ Thanksgiving Day on the fourth Thursday of November since 1864. A: celebrates B: celebrated C: has celebrated D: was celebrated 5 Choose the word whose underlined part is pronounced differently from the others. A: coffee B: payee C: trustee D: trainee 6 Mark the letter A, B, C or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges. Question 14. Clara: “Would you mind helping me with these heavy boxes?” Tom: “_________” A: Yes, I would! B: My God! C: What a pity! D: Not at all! 7 Choose the underlined part A, B, C or D that needs correcting. Picture 13 A: A B: B C: C D: D 8 Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions. Question 16: This group of chemicals is known to be harmful to people’s health. A: natural B: Risky C: safe D: dangerous 9 Choose the correct sentence made from the given words. Question 22. Alaska/a state/the USA/face/both Arctic Ocean/ the Pacific Ocean/. A: Alaska is a state in the USA faces both Arctic Ocean and Pacific Ocean. B: Alaska is a state in the USA face both Arctic Ocean and Pacific Ocean. C: Alaska, a state in the USA face both Arctic Ocean and Pacific Ocean. D: Alaska, a state in the USA, faces both Arctic Ocean and Pacific Ocean.