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DNA Biology Practice Test
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Thymine is which of the following in DNA?
Ribose sugar
Nitrogen-containing base found in DNA
Purine base
Hydrogen bond donor
Reveal Answer
Correct Answer:
Nitrogen-containing base found in DNA
Explanation:
Thymine is a nitrogen-containing base found in DNA. It belongs to the pyrimidine class, one of the four bases that encode genetic information in DNA, and it attaches to the deoxyribose sugar in the DNA backbone. It is not a sugar itself (that would be ribose or deoxyribose), and it is not a purine (those are adenine and guanine). In the DNA double helix, thymine pairs with adenine through two hydrogen bonds, helping to stabilize the structure. This combination of being a DNA base, specifically a pyrimidine, is what makes the correct description.
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