Biology 9700 · AS & A Level · Replication and division of nuclei and cells

Replication and division of nuclei and cells — practice question

As the lagging strand is being replicated, small DNA fragments are formed. DNA ligase then joins these fragments together. Which row gives the correct description of the structure of these short DNA fragments?

  • Ahave base sequences that are complementary to the newly synthesised leading DNA strand: ✗; consists of one polynucleotide strand: ✗; contains only carbon, hydrogen, oxygen and nitrogen: ✓
  • Bhave base sequences that are complementary to the newly synthesised leading DNA strand: ✗; consists of one polynucleotide strand: ✓; contains only carbon, hydrogen, oxygen and nitrogen: ✗
  • Chave base sequences that are complementary to the newly synthesised leading DNA strand: ✓; consists of one polynucleotide strand: ✗; contains only carbon, hydrogen, oxygen and nitrogen: ✓
  • Dhave base sequences that are complementary to the newly synthesised leading DNA strand: ✓; consists of one polynucleotide strand: ✓; contains only carbon, hydrogen, oxygen and nitrogen: ✗

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