(a)[3]
A red blood cell has a short lifespan because the nucleus and other organelles are lost. State one function carried out by each of the organelles listed before they are lost from the developing red blood cell: rough endoplasmic reticulum; Golgi body; centrioles.
(b)[3]
State the most suitable term to match each description A to C. A The part of the haem group that binds oxygen in each haemoglobin polypeptide. B The compound produced when carbon dioxide binds to haemoglobin. C The compound produced when hydrogen ions ($\text{H}^+$) bind to haemoglobin.