996 past contests
Topic 36 · Systole: the contraction phase of the cardiac cycle
Topic 50 · Aneuploidy: an abnormal chromosome number
Topic 5 · Facultative anaerobe: an organism that switches between aerobic and anaerobic respiration
Topic 2 · Colors of light not absorbed by a photosynthetic pigment, inferred from its apparent color
Topic 28 · Non-fungal pathogen genera responsible for foodborne illness
Topic 33 · Effect of dehydration on kidney water retention and urine concentration
Topic 9 · Cartilage as the source of flexibility in the rigid-boned rib cage
Topic 18 · Enzymatic browning of cut fruits and vegetables
Topic 4 · Long-term physiological changes during acclimatization to high altitude
Topic 43 · Brackish water: salinity intermediate between fresh water and seawater
Topic 5 · Purpose of moist, thin amphibian skin: cutaneous respiration
Topic 22 · Melanin as the pigment responsible for human skin tone
Topic 39 · Distinguishing primary from secondary air pollutants
Topic 5 · Number of co2 molecules generated per acetyl-coa in the citric acid cycle
Topic 43 · Marine heatwaves: persistent anomalously warm ocean temperatures
Topic 5 · Cyanide poisoning: blocking the electron transport chain and halting oxidative phosphorylation
Topic 6 · Steer: a bull castrated before reaching sexual maturity
Topic 11 · The bottleneck effect: sharp population reduction and loss of genetic diversity
Topic 8 · Stifling: killing the silkworm pupa without damaging the cocoon shell
Topic 52 · Mitochondrial dna as an example of uniparental (matrilineal) inheritance