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BIO NMDCAT Structure of DNA
nmdcat.online July 3, 2026

68. The chemical component of a deoxyribonucleotide that is modified during the epigenetic process of DNA methylation is the

A. Phosphate group
B. Deoxyribose sugar ring
C. Nitrogenous base (typically Cytosine)
✓
D. Phosphodiester backbone

📝 Explanation

DNA methyltransferases add a methyl group to the carbon-5 position of cytosine rings, a key modification for silencing gene expression.

📖 Additional Information

  • Phosphate group
  • Deoxyribose sugar ring
  • Nitrogenous base (typically Cytosine)
  • Phosphodiester backbone

DNA methyltransferases add a methyl group to the carbon-5 position of cytosine rings, a key modification for silencing gene expression.

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