O LevelBiologyCambridgeExam Questions17. Inheritance17.2 DNA

DNA (Cambridge O Level Biology)

Exam Questions

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DNA is a large molecule made from two chains of nucleotides held together by cross-links between pairs of bases.

Which of the following is a correct base pair?

  • T with C

  • G with A

  • C with G

  • C with A

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Which shows the correct size order of structures, starting with the smallest?

  • Gene →  DNA strand →  chromosomes →  nucleus

  • DNA strand →  chromosome →  gene → nucleus

  • Chromosome →  gene →  DNA strand →  nucleus

  • Nucleus →  chromosome →  DNA strand →  gene

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A strand of DNA is shown below:

T ― G ― A ― A ― C ― T ― A ― G ― C ― C

Which of the following shows the correct order of bases on the complementary strand of DNA?

  • A ― C ― T ― T ― A ― A ― T ― C ― G ― G

  • C ― A ― G ― G ― T ― C ― G ― A ― T ― T

  • T ― G ― A ― A ― C ― T ―  A ― G ― C ― C

  • A ― C ― T ― T― G ― A ― T ― C ― G ― G

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