DP Biology (last assessment 2024)
Question 18M.3.HL.TZ2.21c
| Date | May 2018 | Marks available | [Maximum mark: 3] | Reference code | 18M.3.HL.TZ2.21c |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Suggest | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 3]
18M.3.HL.TZ2.21c
(c)
Suggest how changes in hemoglobin could help humans become better adapted to living at high altitude.
[3]
Markscheme
a. induced conformational change in the structure of the hemoglobin molecule occurs
b. «this» hemoglobin has higher affinity for oxygen
c. saturation curve shifted to the left «because of low O2 levels»
d. «this» hemoglobin becomes more saturated at lower partial pressures of oxygen
e. increased hematocrit/concentration of hemoglobin/red blood cells to carry more O2
Allow answers in an annotated diagram.
