DP Chemistry (last assessment 2024)
Question 18M.3.hl.TZ2.11b
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.hl.TZ2.11b |
| Level | hl | Paper | 3 | Time zone | TZ2 |
| Command term | Outline | Question number | b | Adapted from | N/A |
b.
[Maximum mark: 2]
18M.3.hl.TZ2.11b
Hemoglobin contains an iron ion that can bind to oxygen as part of the process of respiration.
(b)
Outline two differences between normal hemoglobin and foetal hemoglobin.
[2]
Markscheme
Any two of:
foetal hemoglobin has higher affinity for oxygen «than normal hemoglobin»
foetal hemoglobin is less sensitive to inhibitors/2,3-bisphosphoglycerate/2,3-BPG/DPG «than normal hemoglobin»
foetal hemoglobin contains two gamma units instead of the two beta units found in adult hemoglobin
[2 marks]
