Multiple Choice
Which type of bond connects the two complementary strands of DNA together?
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7. DNA and Chromosome Structure
DNA Structure
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DNA is made of two chains of nucleotides. Which type of bonds hold the two chains together?
A
Ionic bonds
B
Phosphodiester bonds
C
Hydrogen bonds
D
Peptide bonds
Verified step by step guidance1
Understand the structure of DNA: DNA consists of two strands forming a double helix, where each strand is made up of nucleotides.
Identify the bonds within a single strand: The nucleotides in each strand are connected by phosphodiester bonds, which link the sugar and phosphate groups.
Focus on the interaction between the two strands: The two strands are held together by bonds between the nitrogenous bases (adenine, thymine, cytosine, guanine) on opposite strands.
Recall the type of bond between complementary bases: These bonds are hydrogen bonds, which are weaker than covalent bonds but strong enough to stabilize the double helix structure.
Conclude that the correct answer is hydrogen bonds because they specifically hold the two DNA chains together by base pairing.
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