Biology 9700 · AS & A Level · The microscope in cell studies

The microscope in cell studies — practice question

Which nucleic acid bases are classified as purines?

  • Aadenine and cytosine
  • Bcytosine and thymine
  • Cguanine and adenine
  • Duracil and cytosine

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI