All living cells respire - AQA - GCSE Biology - Question 4 - 2018 - Paper 1
Question 4
All living cells respire.
Respiration transfers energy from glucose for muscle contraction.
Describe how glucose from the small intestine is moved to a muscle cell... show full transcript
Worked Solution & Example Answer:All living cells respire - AQA - GCSE Biology - Question 4 - 2018 - Paper 1
Step 1
Describe how glucose from the small intestine is moved to a muscle cell.
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Answer
Glucose is absorbed by diffusion into the bloodstream. Once in the bloodstream, blood transports the glucose to the muscles through the capillaries.
Step 2
What is the purpose of the liquid paraffin in Tube A?
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Answer
To stop air getting in.
Step 3
What colour would you expect the indicator to be in Tube B during maximum rate of anaerobic respiration?
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Answer
Yellow.
Step 4
Suggest how the experiment could be changed to give a reproducible way to measure the rate of the reaction.
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Answer
To measure the rate of the reaction reproducibly, an apparatus such as a gas syringe can be used to collect the CO₂ produced. This should be done over a fixed time interval using a timer.
Step 5
Compare anaerobic respiration in a yeast cell with anaerobic respiration in a muscle cell.
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Answer
Anaerobic respiration in yeast cells produces ethanol and carbon dioxide, while muscle cells produce lactic acid. Both processes yield a small amount of energy. However, yeast can survive longer without oxygen compared to muscle cells, which may lead to fatigue.
