Question 18M.3.HL.TZ1.a
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.HL.TZ1.a |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Outline | Question number | a | Adapted from | N/A |
Data was collected on rabbit red blood cells that were exposed to sodium chloride (NaCl) and scorpion venom. Under some osmotic conditions red blood cells swell and burst, releasing hemoglobin (hemolysis). The graph shows the response of red blood cells to different concentrations of sodium chloride, with and without scorpion venom.
[Source: Adapted from Mirakabadi A Z, et al., (2006), J. Venom. Anim. Toxins incl. Trop. Dis., 12 (1), pages 67–77 (London: BioMed Central)]
Outline the effect of the venom on the hemolysis of red blood cells.
[2]
a. in NaCl concentrations between 0.3 to 0.5 % venom increases the percentage of hemolysis/more cells lyse
b. venom has no effect below 0.3% and above 0.55% NaCl
OR
Venom has no effect at very low or very high NaCl concentrations
