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CAIE IGCSE Biology 1.2.6 Dna Base Sequences for Classification Questions

Practise comparing aligned DNA base sequences, counting differences and using molecular classification trees to judge how closely organisms are related.

Syllabus
2026–2028
Course
Biology 0610

Exam points

  • compare aligned DNA base sequences, count differences and use fewer differences to identify closer relatives
  • explain why DNA sequence evidence can distinguish organisms that look alike or are difficult to culture
  • use reference sequences or a molecular classification tree to identify an unknown species or strain

CAIE IGCSE Biology 1.2.6 Dna Base Sequences for Classification Questions question 1

[Maximum number: 1]

What is used as a means of classification?

A

the number of strands of mRNA

B

the shape of DNA molecules

C

the sequence of bases in DNA

D

the types of bases in DNA

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