The surface tension of the layer of liquid lining the alveoli tends to pull the walls inwards so alveoli could collapse. Which statements could explain how this is prevented? 1 Alveolar fluid is moved around by cilia. 2 Elastic fibres keep the alveoli open. 3 Epithelial cells secrete a chemical that reduces the cohesion in water.

Which of these statements could describe the effect of carbon monoxide in cigarette smoke? 1 It binds irreversibly to…

Which of these statements about the formation of haemoglobinic acid are correct? 1 It depends on the formation of car…

What can combine with the haem group of a haemoglobin molecule? 1 oxygen 2 carbon dioxide 3 carbon monoxide

In the hybridoma method, what is grown by cell culture to produce monoclonal antibodies?

Which type of immunity does a baby have at birth?

Factor VIII can be made as a recombinant human protein.