Answer to Question #44860 in Molecular Biology for Souvik

Question

In DNA segment of six coils,22 bp are linked by two hydrogen bonds.How many cytosine bases would be present-
A)22 B)38 C)44 D)76
Please explain.

Answer 1

B-DNA segment contains approximately 10 base pairs percoil, so 6 coils contain 60 base pairs. Adenine and thymine bases form 2
hydrogen bonds. Thus, total number of cytosine and guanine base pairs is 60 - 22 = 38. As the number of cytosine bases is equal to the number of guanine bases, both equal to 38 bases