Bài 7.(97) Xét hai gen trong một tế bào: gen thứ nhất có A-G=500, phân tử mARN sinh ra từ gen thứ nhất có khối lượng 900.000 đvC. Gen thứ hai có 75 vòng xoắn, phân tử mARN sinh ra từ gen thứ hai có A:U:G:X lần lượt theo tỉ lệ 4:3:2:1. a. Gen thứ nhất có bao nhiêu liên kết Hidro? b. Phân tử mARN sinh ra từ gen 2 có chieeug dài bao nhiêu micromet. c. Tính số lượng mỗi loại Nu trong tế bào? d. Khi tế bào nguyên phân 3 lần liên tiếp, đòi hỏi môi trường nội bào cung cấp mỗi loại Nu là bao nhiêu?

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