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The nucleic acid base having two possible binding sites is

$\begin {array} {1 1} (A)\;Thymine & \quad (B)\;Cytosine \\ (C)\;Guanine & \quad (D)\;Adenine \end {array}$

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As the name suggests, thymine may be derived by methylation of uracil at the 5th carbon. In RNA, thymine is replaced with uracil in most cases. In DNA, thymine (T) binds to adenine (A) via two hydrogen bonds, thus stabilizing the nucleic acid structures.
Ans : (A)
answered Mar 29, 2014 by thanvigandhi_1
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