阿摩線上測驗
25. The average molar mass of one base pair of nucleotides in DNA is approximately 600 g/mol. The spacing between successive base pairs is about 0.34 nm, and a complete turn in the helical structure of DNA occurs about every 3.4 nm. If a DNA molecule has a molar mass of 4.5 × 109 g/mol, there are approximately _____ complete turns existing in the DNA a-helix structure.
(A) 5.2 × 1012
(B) 4.6 × 109
(C) 8.0 × 105
(D) 2.6 × 106
(E) 9.4 × 103
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統計： A(0), B(0), C(6), D(1), E(0) #3085489
統計： A(0), B(0), C(6), D(1), E(0) #3085489
