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How many strands make up the structure of a typical DNA molecule?
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7. DNA and Chromosome Structure
DNA Structure
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In a strand of DNA, which type of bond connects the nucleotides within the same strand?
A
Peptide bond
B
Ionic bond
C
Hydrogen bond
D
Phosphodiester bond
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Recall the structure of a DNA strand: it consists of a sugar-phosphate backbone with nitrogenous bases attached to the sugar molecules.
Understand that nucleotides within the same strand are linked together by bonds between the sugar of one nucleotide and the phosphate group of the next nucleotide.
Identify the type of bond that connects the sugar of one nucleotide to the phosphate group of the adjacent nucleotide; this bond is called a phosphodiester bond.
Differentiate this from hydrogen bonds, which connect complementary bases between two strands, and peptide bonds, which link amino acids in proteins.
Conclude that the correct bond connecting nucleotides within the same DNA strand is the phosphodiester bond.
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