In the context of DNA structure, which of the following components is NOT found in DNA?

• A. Phosphate group
• B. Thymine
• C. Uracil
• D. Deoxyribose sugar

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the basic components of DNA. DNA is composed of a sugar-phosphate backbone and nitrogenous bases attached to the sugar.
2. Step 2: Identify the sugar in DNA. DNA contains deoxyribose sugar, which is a five-carbon sugar lacking one oxygen atom compared to ribose.
3. Step 3: Recognize the nitrogenous bases in DNA. DNA contains four bases: adenine (A), thymine (T), cytosine (C), and guanine (G).
4. Step 4: Compare the bases in DNA and RNA. RNA contains uracil (U) instead of thymine, so uracil is not found in DNA.
5. Step 5: Conclude that among the given options, uracil is the component NOT found in DNA because it is specific to RNA.