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Question Video: Recalling the Type of Bond That Forms between Adjacent Nucleotides in the DNA Backbone Biology

A list of bonds found in biological molecules is provided. Which of these bonds is found between adjacent nucleotides in a DNA double helix? 1. Hydrogen 2. Peptide 3. Phosphodiester 4. Ionic 5. Glycosidic

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Video Transcript

A list of bonds found in biological molecules is provided. Which of these bonds is found between adjacent nucleotides in a DNA double helix? (1) Hydrogen, (2) peptide, (3) phosphodiester, (4) ionic, (5) glycosidic.

This question is asking us about the type of bond found in DNA, so let’s discuss the structure of DNA in some detail. DNA is made up of two strands that coil around each other in a double-helix shape. Here we can see the chemical structure of DNA with the two strands indicated. Each strand is made up of repeating subunits called nucleotides. Each nucleotide is made up of three parts: a phosphate group, a pentose sugar — in DNA, this pentose sugar is called deoxyribose — and a nitrogenous base. In DNA, there’s four nitrogenous bases: guanine, or G for short, cytosine, adenine, and thymine. These nitrogenous bases can base-pair with each other by forming hydrogen bonds. This is what holds the two strands of DNA together.

Nucleotides are joined together by bonds called phosphodiester bonds. This bond includes the phosphate group as well as the two attached carbons. Going back to our question, the name of the bond that joins adjacent nucleotides is called a phosphodiester bond.

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