Biology AQA

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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

Other cards in this set

Card 2

Front

Write out the the equation that shows the reaction of lactose being catalysed by an enzyme

Back

(Lactose +) Water; --> (Glucose +) Galactose

Card 3

Front

Name the type of chemical reaction in the breaking down of lactose

Back

Preview of the front of card 3

Card 4

Front

describe how a biuret test will distinguish between a solution of lactase and a solution of lactose

Back

Preview of the front of card 4

Card 5

Front

Describe the path by which oxygen goes from an alveolus to the blood.

Back

Preview of the front of card 5
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