Multiple Choice
Which of the following lists all the components found within all DNA nucleotides?
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7. DNA and Chromosome Structure
DNA Structure
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Which type of bond holds the two complementary strands of DNA together?
A
Ionic bonds
B
Hydrogen bonds
C
Disulfide bonds
D
Phosphodiester bonds
Verified step by step guidance1
Understand the structure of DNA: DNA consists of two complementary strands forming a double helix.
Identify the bonds within each strand: The backbone of each DNA strand is held together by phosphodiester bonds between sugar and phosphate groups.
Focus on the interaction between the two strands: The complementary bases (adenine-thymine and guanine-cytosine) on opposite strands pair with each other.
Recall the type of bond that forms between complementary bases: These base pairs are connected by hydrogen bonds, which are weaker than covalent bonds but strong enough to stabilize the double helix.
Conclude that the two complementary strands of DNA are held together specifically by hydrogen bonds between the nitrogenous bases.
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