9700/23/O/N/25 · Biology October/November 2025 Paper 23
6 questions, 60 marks. Each one links to its official mark scheme.
- Question 1 · 7 marks · Diffusion, osmosis and active transport, Organelles
- Question 2 · 14 marks · Collagen, Functions of the tissues, Genes and the genetic code, Gene mutations
- Question 3 · 9 marks · How enzymes work, Immobilised enzymes
- Question 4 · 6 marks · Monomers, polymers and glucose, Nucleotides, ATP and RNA, Organelles, DNA structure
- Question 5 · 4 marks · Antibiotics, Inhibitors
- Question 6 · 20 marks · Heart structure, Cardiac cycle, Blood and tissue fluid, Immune responses
Questions and mark schemes from Cambridge International past papers. Paperstreak isn't affiliated with Cambridge.