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| Question | Answer |
| What are haemoglobin molecules ? | The haemoglobins are a group of chemically similar molecules found in a wide variety of organisms, |
| What is the structure of haemoglobin | Primary structure - 4 polypeptide chains Secondary structure - polypeptide chains coiled into a helix Tertiary structure - each polypeptide chain is folded into a precise shape Quaternary structure - all polypeptides are linked together to form a spherical molecule |
| What type of ion is contained in haem group | Each polypeptide is associated with a haem group which contains a ferrous ion. Each ferrous ion can combine with a single oxygen molecule making a total of four oxygen molecules hat can be carried by a single haemoglobin molecule in humans. |
| What is the role of haemoglobin and what two things must haemoglobin do to be efficient in carrying out its role | The role of haemoglobin is to transport oxygen. to be efficient at transporting oxygen, haemoglobin must : readily associate with oxygen at the surface where gas exchange takes place Readily dissociate from oxygen at those tissues requiring it. |
| What happens in the presence of carbon dioxide. | In the presence of carbon dioxide |
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