AQA GCSE Biology Unit 3

what is the name given to the method of transporting particles against a concentration gradient?

active transport

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how is the surface area of the lungs increased?

alveoli

2 of 20

what is the purpose of veins?

they return 'used' blood back to the heart

3 of 20

how thick is a capillary wall?

one cell thick

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what is the job of red blood cells?

to carry oxygen around the body

5 of 20

what does haemoglobin combine with in the lungs?

oxygen to become oxyhaemoglobin

6 of 20

what does an increase in muscle activity require?

both

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what is glucose stored as?

glycogen

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what is the correct reaction for anaerobic respiration?

glucose --> lactic acid + water (+ energy)

9 of 20

true or false: nephrons are the filtration units in the kidneys?

True

10 of 20

what happens to sugars, a sufficient amount of ions, and a sufficient amount of water as the liquid flows along the nephron?

they are reabsorbed back into the blood

11 of 20

what do kidneys remove from the blood?

waste products

12 of 20

when a membrane is partially permeable, what can it do?

let substances through which can fit through the small holes

13 of 20

when would someone need to use a dialysis machine?

after they have had a kidney failure

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true or false: the only cure for kidney disease at the moment in to have a kidney transplant?

True

15 of 20

what 2 foods can be made through bacteria?

cheese + yoghurt

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what is the correct equation for the anaerobic respiration of glucose by yeast?

glucose --> ethanol + carbon dioxide + energy

17 of 20

what is mycoprotein used for?

making meat substitutes

18 of 20

who discovered penicillin?

alexander flemming

19 of 20

what is the normal % of methane and carbon dioxide in biogas?

70% methane 30% CO2

20 of 20

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AQA GCSE Biology Unit 3

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