The monomer unit from which a nucleic acid is built is
Correct answer: C. a nucleotide
- A. an amino acid
- B. a monosaccharide
- C. a nucleotide
- D. a fatty acid
Explanation
Each nucleotide consists of a pentose sugar, a phosphate group and a nitrogenous base, and successive nucleotides are linked by phosphodiester bonds between the sugar of one and the phosphate of the next. Amino acids are the monomers of proteins and monosaccharides those of polysaccharides. Fatty acids are components of lipids, which are not true polymers at all.
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About Classification of Biological Molecules
Biological molecules are classified as carbohydrates, lipids, proteins and nucleic acids, with water, minerals and vitamins also supporting cellular processes. The key distinctions involve their monomers, chemical bonds, structures and functions, including glucose and starch, fatty acids and triglycerides, amino acids and polypeptides, and nucleotides in DNA and RNA.
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