Kaplan Nursing Entrance Practice Exam

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Which nucleotides are found in DNA?

Adenine, Uracil, Cytosine, Guanine
Adenine, Thymine, Guanine, Cytosine
Adenine, Thymine, Guanine, Uracil
Thymine, Cytosine, Guanine, Ribose

The correct answer is: Adenine, Thymine, Guanine, Cytosine

DNA is composed of four specific nucleotides, which are the building blocks of its structure. These nucleotides include adenine (A), thymine (T), guanine (G), and cytosine (C). Each nucleotide consists of a phosphate group, a sugar (deoxyribose in the case of DNA), and a nitrogenous base. In DNA, adenine pairs with thymine through two hydrogen bonds, while guanine pairs with cytosine through three hydrogen bonds. This base pairing is crucial for the double-helix structure of DNA and plays a significant role in the replication and transcription processes. The inclusion of uracil in any option is a key distinguishing factor, as uracil is found in RNA, replacing thymine. Therefore, options containing uracil are not relevant to DNA structure. Likewise, ribose is the sugar present in RNA, whereas DNA specifically contains deoxyribose. Thus, considering the context of DNA composition, the correct answer reflects the accurate set of nucleotides that are essential for DNA's structure and function.