Multiple Choice
Which components make up the backbone of a DNA molecule?
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7. DNA and Chromosome Structure
DNA Structure
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Which type of bond connects the two complementary strands of DNA together?
A
Hydrogen bonds
B
Ionic bonds
C
Phosphodiester bonds
D
Disulfide bonds
Verified step by step guidance1
Understand the structure of DNA: DNA consists of two complementary strands forming a double helix.
Identify the types of bonds present in DNA: The backbone of each strand is held together by phosphodiester bonds, which connect sugar and phosphate groups.
Recognize that the two strands are connected to each other by bonds between nitrogenous bases (adenine-thymine and guanine-cytosine).
Recall that these base pairs are held together specifically by hydrogen bonds, which are weaker than covalent bonds but strong enough to stabilize the double helix.
Conclude that the correct bond type connecting the two complementary strands of DNA is hydrogen bonds.
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