Biology Unit 2 3.0 / 5 based on 1 rating ? BiologyASAQA Created by: MARTHA GREENINGCreated on: 30-05-13 18:01 Structure of a haemoglobin molecule Quaternary with 4 polypeptide chains each with a 'heam' group that contains iron which oxygen binds too. 1 of 6 How many oxygen molecules can a heamoglobin molecule carry? Four 2 of 6 What is partial pressure of oxygen? A measure of the concentration of oxygen. 3 of 6 When does oxygen load onto heamoblobin? When there is a high partial pressure of oxygen 4 of 6 What is the Bohr effect? Haemoglobin gives up its oxygen more readily at higher partial pressures of CO2 which moves the dissociation curve to the right. 5 of 6 Why would the dissociation curve move to the left? If there is a low concentration of oxygen, so the haemoglobin has a higher affinity for the oxygen. 6 of 6
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