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In the structure of DNA, which nitrogenous base pairs with thymine?
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7. DNA and Chromosome Structure
DNA Structure
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How are the two strands of nucleic acid in DNA held together?
A
By peptide bonds between adjacent nucleotides
B
By ionic interactions between sugar molecules
C
By hydrogen bonds between complementary nitrogenous bases
D
By covalent bonds between phosphate groups
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Recall the structure of DNA, which consists of two strands forming a double helix.
Understand that each strand is made up of nucleotides, which include a sugar, a phosphate group, and a nitrogenous base.
Recognize that the backbone of each strand is held together by covalent bonds called phosphodiester bonds between the sugar of one nucleotide and the phosphate of the next.
Focus on how the two strands interact: the nitrogenous bases on one strand pair with complementary bases on the opposite strand.
Identify that these complementary bases are held together by hydrogen bonds, which are weaker than covalent bonds but strong enough to stabilize the double helix structure.
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