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

53. The structural component of the DNA molecule that forms the outer rails of the helical ladder is composed of alternating

A. Nitrogenous bases and sugars
B. Phosphate groups and deoxyribose sugars
✓
C. Purines and pyrimidines
D. Amino acids and ribose sugars

📝 Explanation

The structural framework of the DNA strand is formed by a repeating chain of deoxyribose sugars linked by neutral phosphodiester groups.

📖 Additional Information

  • Nitrogenous bases and sugars
  • Phosphate groups and deoxyribose sugars
  • Purines and pyrimidines
  • Amino acids and ribose sugars

The structural framework of the DNA strand is formed by a repeating chain of deoxyribose sugars linked by neutral phosphodiester groups.

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