Which statement about DNA nucleotides is true?

Which statement about DNA nucleotides is true?

• A. The four bases are Adenine, Cytosine, Guanine, Thymine
• B. DNA uses Uracil instead of Thymine
• C. DNA uses Ribose sugar rather than deoxyribose
• D. DNA is always single-stranded

Answer: (A)

DNA nucleotides contain deoxyribose sugar, a phosphate group, and one of four bases: adenine, cytosine, guanine, or thymine. The four bases in DNA are A, C, G, and T, with thymine unique to DNA (RNA uses uracil instead). The sugar in DNA is deoxyribose, not ribose, and most DNA is double-stranded rather than single-stranded. Because of these facts, the statement listing the four bases as adenine, cytosine, guanine, and thymine is the true description of DNA nucleotides.

DNA nucleotides contain deoxyribose sugar, a phosphate group, and one of four bases: adenine, cytosine, guanine, or thymine. The four bases in DNA are A, C, G, and T, with thymine unique to DNA (RNA uses uracil instead). The sugar in DNA is deoxyribose, not ribose, and most DNA is double-stranded rather than single-stranded. Because of these facts, the statement listing the four bases as adenine, cytosine, guanine, and thymine is the true description of DNA nucleotides.