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, glucose is then delivered to muscle cells through small blood vessels known as 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 ensure reproducibility, the experiment could collect the CO₂ produced using a measuring cylinder or gas syringe. This volume should be collected in a set time period using a timer or watch.
Step 5
Compare anaerobic respiration in a yeast cell with anaerobic respiration in a muscle cell.
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Answer
Yeast produces ethanol and carbon dioxide, whereas muscle cells produce lactic acid. Both processes release small amounts of energy. Yeast can survive without oxygen, but muscle cells cannot. Additionally, the byproducts of their respiration processes differ significantly.
