Which of the following is not a component of DNA?

Thiamine

The correct answer is Option (1) → Thiamine

Explanation:

• Thiamine:
• Thiamine is not a component of DNA; it is a vitamin (Vitamin B1) involved in cellular metabolism.
• Adenine, Guanine, and Cytosine:
• These are nitrogenous bases found in DNA. DNA consists of four nitrogenous bases:
• Adenine (A) and Guanine (G) (purines)
• Cytosine (C) and Thymine (T) (pyrimidines).

Note: Do not confuse thiamine (Vitamin B1) with thymine, which is a pyrimidine base in DNA.