A student is carrying out an experiment, using the equipment below, to investigate the products of anaerobic respiration (fermentation) - Leaving Cert Biology - Question 14(a) - 2020
Question 14(a)
A student is carrying out an experiment, using the equipment below, to investigate the products of anaerobic respiration (fermentation).
(i) Name an organism, repre... show full transcript
Worked Solution & Example Answer:A student is carrying out an experiment, using the equipment below, to investigate the products of anaerobic respiration (fermentation) - Leaving Cert Biology - Question 14(a) - 2020
Step 1
(i) Name an organism, represented by X in the diagram, involved in the fermentation process.
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Answer
The organism represented by X in the diagram is yeast.
Step 2
(ii) Name the product that is collected in test tube B?
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Answer
The product collected in test tube B is carbon dioxide.
Step 3
(iii) What effect does this product have on the limewater in test tube B?
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Answer
The addition of carbon dioxide to limewater will turn it a milky colour.
Step 4
(iv) Name the other product which forms during fermentation and remains in test tube A.
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Answer
The other product that forms during fermentation and remains in test tube A is alcohol.
Step 5
(v) How do you know when fermentation has finished?
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Fermentation is considered finished when there are no more bubbles produced.
Step 6
(vi) What test can be used to show that the product, named in (iv), is present in test tube A at the end?
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Answer
The test used to show the presence of alcohol in test tube A is the iodiform test.
Step 7
(vii) What colour indicates a positive test for the product?
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A positive test for alcohol will indicate a yellow colour.
Step 8
(viii) What substance is produced as a result of anaerobic respiration in human muscle?
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The substance produced as a result of anaerobic respiration in human muscle is lactic acid.
Step 9
(ix) What effect does this substance have on human muscle?
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Lactic acid can cause cramps in human muscle.
Step 10
(x) Give one other example of modern-day bioprocessing.
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An example of modern-day bioprocessing is the production of yogurt.
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