Multiple choice

The phosphodiester linkages are present in

  1. Proteins

  2. Polysaccharides

  3. Lipids

  4. Nucleic acids

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D Correct answer
Explanation

Nucleic acids are linear polymers (chains) of nucleotides. Each nucleotide consists of three components: a purine or pyrimidine nucleobase (sometimes termed nitrogenous base or simply base), a pentose sugar; and a phosphate group. The sugars and phosphates in nucleic acids are connected to each other in an alternating chain (sugar-phosphate backbone) through phosphodiester linkages.

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