Which of the following nitrogen base is not found in DNA? (1) Thymine (2) Cytosine (3) Guanine (4) Uracil

Answer: (4) Uracil

Nucleotide monomers make up DNA. A nitrogenous base is bound to the deoxyribose sugar with the phosphate moiety in each nucleotide.

  • Adenine (A), guanine (G), cytosine (C), and thymine (T) are the four nitrogenous bases present in DNA.
  • Purine bases are adenine and guanine, while pyrimidine bases are cytosine and uracil.
  • Hydrogen bonds connect the nitrogenous bases of the double helix in DNA.
  • Adenine and thymine form a pair, while guanine and cytosine form a pair.

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