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Nucleotides, DNA structure and replicationEdexcel A-Level Biology A: Mind map

What this mind map covers

  • Nucleotide
  • Polynucleotide
  • Double helix
  • Replication
  • Meselson and Stahl

Exam questions on Nucleotides, DNA structure and replication

  1. A student extracts DNA and RNA from the same cells and analyses the nucleotides that each is made of.
    Describe how two DNA nucleotides are joined together in a polynucleotide.2 marks
  2. Two samples of double-stranded DNA of the same length, sample X and sample Y, are heated slowly until the two strands of each separate. In sample X, 20% of the bases are adenine. In sample Y, 35% of the bases are adenine.
    Explain why the strands of sample X separate at a higher temperature than those of sample Y.2 marks
  3. A section of one strand of a DNA molecule has the base sequence ATGCCGTA. This strand acts as a template during DNA replication in a dividing cell.
    Describe how a new strand is formed on this template during DNA replication.3 marks
See the full worksheet

Written by the Exaim team, led by Shaun Daswani (Head of Upper Secondary, Improve ME Institute; MSc Financial Mathematics, Imperial College London; BSc, UCL) and Jason Daswani (operational lead, Improve ME Institute; LSE).