9700/42 · May/June 2024

Osmoregulation: osmoreceptors, ADH and its effect on urine production.

Causes of phenotypic variation and how variation allows evolution.

Colour patterns in tortoise beetles: genetic diagrams, codominance and a chi-squared test.

Gene, protein and phenotype in haemophilia, and gibberellin and stem height in peas.

BRCA1 mutations, genetic screening and cancer risk, and survival data after drug treatment.

Oxygen entering the mitochondrion, the electron transport chain and ATP synthase, and mitochondrial DNA.

Temperature and light intensity as limiting factors, and photolysis in non-cyclic photophosphorylation.

Neurones and myelin, impulse transmission, and how morphine acts at a cholinergic synapse.

An invasive toad in Madagascar, and IVF in conserving the eastern black rhino.

Negative feedback in blood glucose control, glucagon action, and urine test strips for glucose.