Question:

In the double helix of DNA, the nitrogenous base adenine(A)?

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A. pairs (by two hydrogen bonds) with thymine (T)

B. pairs (by two hydrogen bonds)with another adenine

C. pairs (by three hydrogen bonds)with guanine (G)

D. pairs (by three hydrogen bonds) with cytosine

E. A or C

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2 ANSWERS


  1. A. Thymine


  2. A. Except in RNA, when it pairs with uracil.

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