Multiple Choice
Which of the following best describes the structure of DNA in terms of the number of strands it contains?
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3. Extensions to Mendelian Inheritance
Overview of interacting Genes
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In the context of gene interactions and DNA structure, how many hydrogen bonds connect adenine and thymine in a DNA double helix?
A
3
B
2
C
1
D
4
Verified step by step guidance1
Recall that in the DNA double helix, base pairing occurs between purines and pyrimidines: adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C).
Understand that the stability of these base pairs is due to hydrogen bonds formed between the nitrogenous bases.
Remember the specific number of hydrogen bonds for each base pair: adenine and thymine are connected by 2 hydrogen bonds, while guanine and cytosine are connected by 3 hydrogen bonds.
Identify that the question asks specifically about the number of hydrogen bonds between adenine and thymine, so focus on that pair.
Conclude that adenine and thymine are connected by 2 hydrogen bonds in the DNA double helix.
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