How are the nitrogenous bases in DNA and RNA different?

• A. DNA contains adenine, while RNA does not.
• B. Both DNA and RNA contain the same nitrogenous bases.
• C. DNA contains thymine, while RNA contains uracil.
• D. DNA contains uracil, while RNA contains thymine.

Answer: (C)

Verified step by step guidance

1. Understand that both DNA and RNA are nucleic acids composed of nucleotides, which include a sugar, a phosphate group, and a nitrogenous base.
2. Identify the four nitrogenous bases in DNA: adenine (A), thymine (T), cytosine (C), and guanine (G).
3. Identify the four nitrogenous bases in RNA: adenine (A), uracil (U), cytosine (C), and guanine (G).
4. Recognize the key difference between DNA and RNA: DNA contains thymine (T), whereas RNA contains uracil (U) instead of thymine.
5. Conclude that the correct statement is: DNA contains thymine, while RNA contains uracil, highlighting the substitution of uracil for thymine in RNA.