複選題
2. Which physical or chemical factor can cause DNA mutation?
(A) Heat
(B) Cold
(C) Ultra-violet light
(D) Ethidium bromide
(E) Nitrous acid
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統計: A(3), B(1), C(5), D(5), E(1) #3413595
統計: A(3), B(1), C(5), D(5), E(1) #3413595