Which statement about nitrogen bases is presented as true in the material?

Which statement about nitrogen bases is presented as true in the material?

• A. There are 5 nitrogen bases
• B. There are 4 nitrogen bases
• C. There are 3 nitrogen bases
• D. There are 6 nitrogen bases

Answer: (A)

There are five nitrogen bases when you consider both DNA and RNA. The bases are adenine, thymine, cytosine, guanine, and uracil. In DNA, thymine is the base that pairs with adenine, and in RNA, uracil takes thymine’s place and pairs with adenine. Because thymine and uracil are distinct molecules, you count five different bases across the two types of nucleic acids. A DNA molecule itself contains four bases (A, T, C, G), and an RNA molecule contains four bases (A, U, C, G), but together they amount to five unique nitrogen bases commonly discussed.

There are five nitrogen bases when you consider both DNA and RNA. The bases are adenine, thymine, cytosine, guanine, and uracil. In DNA, thymine is the base that pairs with adenine, and in RNA, uracil takes thymine’s place and pairs with adenine. Because thymine and uracil are distinct molecules, you count five different bases across the two types of nucleic acids. A DNA molecule itself contains four bases (A, T, C, G), and an RNA molecule contains four bases (A, U, C, G), but together they amount to five unique nitrogen bases commonly discussed.