Nuclêôtit là đơn phần cấu trúc bao nhiêu loại phân tử nào sau đây? 1.mARN 2.tARN. 3.rARN 4.ARNpolimeraza A.1 B.2. C.3. D.4 Nêu ra những loại nào

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Bài 5: Tính nhanh a. 45 x 11 - 450 - 45 ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... b. ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Bài 6: Tìm y: 198 - 56 : 8 x y = 184