Multiple Choice
Which structural characteristic best describes a DNA molecule?
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7. DNA and Chromosome Structure
DNA Structure
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Which type of bond holds the nitrogenous bases together across the middle of the DNA double helix?
A
Hydrogen bonds
B
Ionic bonds
C
Covalent bonds
D
Phosphodiester bonds
Verified step by step guidance1
Understand the structure of DNA: DNA is composed of two strands forming a double helix, with nitrogenous bases paired in the middle.
Identify the types of bonds in DNA: Covalent bonds hold the sugar-phosphate backbone together, while bonds between bases hold the two strands together.
Recall that the sugar-phosphate backbone is connected by phosphodiester bonds, which are a type of covalent bond.
Recognize that the nitrogenous bases pair specifically (A with T, G with C) through hydrogen bonds, which are weaker and allow the strands to separate during replication.
Conclude that the bonds holding the nitrogenous bases together across the middle of the DNA double helix are hydrogen bonds.
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