Some painkillers are recommended to be taken after a meal - Scottish Highers Human Biology - Question 5 - 2022
Question 5
Some painkillers are recommended to be taken after a meal. However, painkillers can inhibit the action of digestive enzymes.
An investigation was carried out into t... show full transcript
Worked Solution & Example Answer:Some painkillers are recommended to be taken after a meal - Scottish Highers Human Biology - Question 5 - 2022
Step 1
Suggest why this may not have allowed a valid comparison of the effects of the different painkillers.
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Answer
The concentration, solubility, and size of each tablet or painkiller may be different. This variation can affect how effectively each painkiller inhibits pepsin.
Step 2
Describe the contents of the solution in the control tube.
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Answer
The control tube contains 15 cm³ of water and 5 cm³ of pepsin without any painkiller.
Step 3
Describe how the results were calculated in this investigation.
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Answer
The original mass of cooked egg white is measured, and after 24 hours, the final mass is recorded. The difference in mass indicates how much egg white was broken down by pepsin.
Step 4
State which painkiller had the greatest inhibitory effect on pepsin activity.
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Answer
Aspirin had the greatest inhibitory effect on pepsin activity as it resulted in the least mass of egg white broken down.
Step 5
Describe how the reliability of the results from this investigation could be improved.
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Answer
To improve reliability, the investigation could be repeated for each painkiller and averages calculated to account for variability in results.
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