ID: Class: 12 Subject: Biology Topic: Molecular Basis of Inheritance Type: Very short (VSA) Year: 2025

Question:

Study the given molecular structure of double-stranded polynucleotide chain of DNA and answer the questions that follow. [Diagram of DNA implied]
  • (a) How many phosphodiester bonds are present in the given double-stranded polynucleotide chain ?
  • (b) How many base pairs are there in each helical turn of double helix structure of DNA? Also write the distance between a base pair in a helix.
  • (c) In addition to H-bonds, what confers additional stability to the helical structure of DNA?