> Biochemistry : Nucleic Acids Quiz
Biochemistry : Nucleic Acids Quiz
A nucleic acid is a nitrogen-containing biological polymer that is involved in the storage and transmission of genetic information. The monomer that makes up a nucleic acid is a nucleotide. Each nucleotide has three parts: a monosaccharide, a phosphate base, and a nitrogen base. The phosphate group is constant, but the sugar and the nitrogen base vary. Nucleotides are strung together in a chain that contains alternating sugar and phosphate groups.
Deoxyribonucleic acid (DNA) consists of two long nucleotide chains bound together in a double helical structure. DNA contains four nitrogen bases: adenine, thymine, guanine and cytosine. These nitrogen bases pair up in a specific sequence: adenine to thymine and guanine to cytosine. DNA stores genetic information in cells.
Ribonucleic acid (RNA) differs from DNA in that thymine is never found; instead adenine pairs to uracil. RNA contains the sugar ribose whereas DNA contains deoxyribose. RNA is a single helix, where DNA is a double helix. RNA allows cells to use the information in DNA to make proteins. This quiz covers the basics of DNA and RNA. Select the best answer from the choices.
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