Biology Practice Problems Nucleic Acids Practice Problems Solution: Which of the following does not provide evidence t...

Solution: Which of the following does not provide evidence to support the conclusion that nitrogenous bases pair in specific combinations?A. a purine-purine pair is too wide to account for the 2-nm diameter of the double helix.B. The sugar-phosphate backbone is held together by phosphodiester bonds.C. The X-ray data suggested that the double helix had a uniform diameter.D. Whenever one strand of DNA has a C, the partner strand has a G.E. A pyrimidine-pyrimidine pair is too narrow o account for the 2nm-diameter of the double helix.

Problem

Which of the following does not provide evidence to support the conclusion that nitrogenous bases pair in specific combinations?

A. a purine-purine pair is too wide to account for the 2-nm diameter of the double helix.

B. The sugar-phosphate backbone is held together by phosphodiester bonds.

C. The X-ray data suggested that the double helix had a uniform diameter.

D. Whenever one strand of DNA has a C, the partner strand has a G.

E. A pyrimidine-pyrimidine pair is too narrow o account for the 2nm-diameter of the double helix.

Solution

Nucleic acids are polynucleotides with building blocks that are made of a nitrogenous base, a pentose, and a phosphate group. RNA makes use of the pentose, ribose, while DNA uses deoxyribose. In addition to this, DNA is also know for its usual double-stranded character, the nucleotide bases pair up based on complementarity. This happens as a purine-pyrimidine base pairing. This can be proven by a number of points.

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