Biology AQA 0.0 / 5 ? BiologyBiological moleculesASAQA Created by: Faye OliveCreated on: 11-12-13 10:22 Use your knowledge of water potential to explain why these adults get diarrhoea when Low(er) water potential in lumen / intestine / gut; 1 of 8 Write out the the equation that shows the reaction of lactose being catalysed by an enzyme (Lactose +) Water; --> (Glucose +) Galactose 2 of 8 Name the type of chemical reaction in the breaking down of lactose Hydrolysis 3 of 8 describe how a biuret test will distinguish between a solution of lactase and a solution of lactose Lactase / enzyme blue -> purple / lilac / mauve. Lactase / enzyme is a protein: negative result no change 4 of 8 Describe the path by which oxygen goes from an alveolus to the blood. Through alveolar epithelium; Through capillary epithelium/endothelium 5 of 8 Explain why people with miner’s lung have a lower concentration of oxygen in their blood (Thicker alveolar wall) : no mark, so Longer diffusion pathway / slower diffusion 6 of 8 Describe how ventilation helps to maintain this difference in oxygen (In alveolus) Brings in air containing a high(er) oxygen concentration. Removes air with a low(er) oxygen concentration; 7 of 8 Give one way that helps to maintain the difference in oxygenm concentration Circulation of blood / moving blood; 8 of 8
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