Biology Practice Problems Nucleic Acids Practice Problems Solution: Complete each of the following senteces by selecti...

Solution: Complete each of the following senteces by selecting the correct answer:A. Cytosine is a (purine base / pyrimidine base / purine nucleoside / pyrimidine nucleoside / purine nucleotide / pyrimidine nucleotide).B. Deoxythymidine is a (purine base / pyrimidine base / purine nucleoside / pyrimidine nucleoside / purine nucleotide / pyrimidine nucleotide).C. UMP is a (purine base / pyrimidine base / purine nucleoside / pyrimidine nucleoside / purine nucleotide / pyrimidine nucleotide).D. Guanine is a (purine base / pyrimidine base / purine nucleoside / pyrimidine nucleoside / purine nucleotide / pyrimidine nucleotide).

Problem

Complete each of the following senteces by selecting the correct answer:

A. Cytosine is a (purine base / pyrimidine base / purine nucleoside / pyrimidine nucleoside / purine nucleotide / pyrimidine nucleotide).

B. Deoxythymidine is a (purine base / pyrimidine base / purine nucleoside / pyrimidine nucleoside / purine nucleotide / pyrimidine nucleotide).

C. UMP is a (purine base / pyrimidine base / purine nucleoside / pyrimidine nucleoside / purine nucleotide / pyrimidine nucleotide).

D. Guanine is a (purine base / pyrimidine base / purine nucleoside / pyrimidine nucleoside / purine nucleotide / pyrimidine nucleotide).

Solution

Nucleic acids are polymers of nucleotides (i.e. polynucleotides). These nucleotides are composed of a nitrogenous base, a 5-carbon sugar, and an inorganic phosphate group. Without the phosphate group, this monomer is just called a nucleoside. The nitrogenous bases that are used in these monomers may be purines or pyrimidines. 

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