A) \[TAGCTTAC\]
B) \[TCACATAC\]
C) \[TAGCATAC\]
D) \[TACGATAC\]
Correct Answer: C
Solution :
Because of size and geometries of the bases, the only possible pairings in DNA are between \[G\] (guanine) and \[C\] (cytosine) through three H-bonds and between \[A\] (adenine) and \[T\] (thymine) through two H-bonds. Hence, \[\underset{\begin{smallmatrix} | \\ T \end{smallmatrix}}{\mathop{A}}\,\underset{\begin{smallmatrix} | \\ A \end{smallmatrix}}{\mathop{T}}\,\underset{\begin{smallmatrix} | \\ G \end{smallmatrix}}{\mathop{C}}\,\underset{\begin{smallmatrix} | \\ C \end{smallmatrix}}{\mathop{G}}\,\underset{\begin{smallmatrix} | \\ A \end{smallmatrix}}{\mathop{T}}\,\underset{\begin{smallmatrix} | \\ T \end{smallmatrix}}{\mathop{A}}\,\underset{\begin{smallmatrix} | \\ A \end{smallmatrix}}{\mathop{T}}\,\underset{\begin{smallmatrix} | \\ C \end{smallmatrix}}{\mathop{G}}\,\]
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