| Column I | Column II | ||
| A. | A-DNA | 1. | \[+\,38.6{}^\circ \] (right handed) |
| B. | B-DNA | 2. | \[-\,30\overset{{}^\circ }{\mathop{A}}\,\] (left handed) |
| C. | Z-DNA | 3. | \[+\,32.7{}^\circ \] (right handed) |
| D. | C-DNA | 4. | \[+\,36{}^\circ \] (right handed) |
A) A-1, B-2, C-3, D-4
B) A-4, B-3, C-2, D-1
C) A-2, B-1, C-4, D-3
D) A-3, B-4, C-1, D-2
Correct Answer: D
Solution :
| Helix type | Vertical per bp | Base pair per turn | Rotation bp | Helical diameter |
| A | \[2.56\overset{{}^\circ }{\mathop{A}}\,\] | 11 | \[+32.7{}^\circ \](right handed) | \[23\overset{{}^\circ }{\mathop{A}}\,\] |
| B | \[3.38\overset{{}^\circ }{\mathop{A}}\,\] | 10 | \[+36.0{}^\circ \](right handed) | \[19\overset{{}^\circ }{\mathop{A}}\,\] |
| C | \[3.31\overset{{}^\circ }{\mathop{A}}\,\] | 9.33 | \[+\,38.6{}^\circ \](right handed) | \[19\overset{{}^\circ }{\mathop{A}}\,\] |
| D | \[3.71\overset{{}^\circ }{\mathop{A}}\,\] | 12 | \[-\,30.0{}^\circ \](right handed) | \[18\overset{{}^\circ }{\mathop{A}}\,\] |
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