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In DNA structure, which molecules form the sugar-phosphate backbone of DNA?
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7. DNA and Chromosome Structure
DNA Structure
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Which type of bond primarily holds the two strands of DNA together in the double helix?
A
Phosphodiester bonds between complementary bases across the two strands
B
Peptide bonds between adjacent nucleotides
C
Glycosidic bonds between the sugar and phosphate backbone components
D
Hydrogen bonds between complementary nitrogenous bases
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Understand the structure of DNA: DNA is composed of two strands forming a double helix, where each strand consists of nucleotides linked together.
Identify the bonds within a single strand: Nucleotides in one strand are connected by phosphodiester bonds, which link the sugar of one nucleotide to the phosphate group of the next.
Recognize the bonds between the two strands: The two strands are held together by interactions between nitrogenous bases on opposite strands.
Recall the specific type of bond between complementary bases: These are hydrogen bonds, which form between adenine-thymine and guanine-cytosine base pairs.
Conclude that the primary bond holding the two strands together in the DNA double helix is the hydrogen bond between complementary nitrogenous bases.
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