9700/22 · Oct/Nov 2023
AS Level Structured Questions · 60 marks · 6 questions
- Question 17 marks
Chromatin and histones, chromosome structure at metaphase, and changes to chromosomes from S phase through mitosis.
- Question 212 marks
Keratin structure with disulfide bonds, and comparing keratinase enzymes for temperature and pH range.
- Question 314 marks
Liver blood supply, hepatocyte organelles, Kupffer cells removing old red cells, and peroxisomes vs mitochondria.
- Question 412 marks
Maintaining diffusion gradients in alveoli, ventilation, surfactant, and transcription and translation of a transporter gene.
- Question 59 marks
Tuberculosis species and transmission between people and animals, and spread to arteries.
- Question 66 marks
Xylem vessel elements, cohesion-tension, and how xylem structure reduces resistance to flow.