A molecular biologist isolates an intact, linear double-stranded DNA fragment consisting of 1,000 base pairs and determines that adenine constitutes 30% of the total nitrogenous bases present. Based on the structural properties of double-stranded DNA, which of the following conclusions regarding this fragment is correct?

A) The total number of phosphodiester bonds in the fragment exceeds the total number of hydrogen bonds stabilizing the helix.

B) The molecule contains an equal number of hydrogen bonds contributed by adenine–thymine pairs and guanine–cytosine pairs.

C) Guanine and cytosine together account for 60% of the total nitrogenous bases in the fragment.

D) Complete enzymatic hydrolysis of the fragment yields twice as many deoxyribose molecules as phosphate groups.

DNA structure Transitional Reasoning Download PDF

Biology · Molecular Genetics · Biology · DNA Structure & Replication

1 Biology practice questions on DNA structure. Questions that build towards applied reasoning.