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23.1 Lipase is an enzyme produced in the human digestive system - OCR Gateway - GCSE Biology - Question 23 - 2022 - Paper 1
Question 23
23.1 Lipase is an enzyme produced in the human digestive system. It breaks down lipids. (a) (i) Complete the labels in Fig. 23.1. (ii) Lipase is found in the small ... show full transcript
Worked Solution & Example Answer:23.1 Lipase is an enzyme produced in the human digestive system - OCR Gateway - GCSE Biology - Question 23 - 2022 - Paper 1
Step 1
Step 2
Draw a curve on Fig. 23.2 to show the effect the pH will have on the rate of reaction for the digestion of lipids by lipase
Answer
The curve drawn should start at a lower rate of reaction at acidic pH levels, increase to a peak at alkaline pH (around pH 8), and then decrease as pH becomes more alkaline beyond this point.
Step 3
Describe an experiment that the students could use to investigate the effect of temperature on the breakdown of the lipids found in milk
Answer
To change the independent variable, I will vary the temperature at which the lipase and milk mixture is incubated. The observations I will make include the time taken for the indicator (phenolphthalein) to change color, indicating the breakdown of lipids. Two variables that need to be controlled are the concentration of lipase and the volume of milk used in the experiment to ensure consistency in results.