A) \[78\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[78.4\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[74.8\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[78.2\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: D
Solution :
DNA is helically coiled macromolecule made up of two antiparallel polydeoxyribonucleotide chains held together by hydrogen bonds. One turn of spiral has a distance of \[34{\AA}.\]It contains 10 nudeotides in each chain so that the distance between adjacent nucleorides is \[3.4{\AA}.\]Hence, the length of DNA having 23 base pairs is \[3.4\times 23=78.2{\AA}.\]
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