0653.B7.3.05 — State where, in the digestive system, amylase, protease and lipase are secreted and where they act: past paper questions
Real questions on 0653.b7.3.05 — state where, in the digestive system, amylase, protease and lipase are secreted and where they act
The newest 9 of 9 written questions. Open one to see it on the real paper.
- 0653/21 · October/November 2024 · Q6[1]
Which enzymes are secreted by the organ labelled X?
See it on the paper → - 0653/63 · October/November 2020 · Q3b(v)[2]
Describe in detail the relationship between temperature and rate of reaction.
See it on the paper → - 0653/63 · October/November 2020 · Q3b(vi)[1]
Suggest a reason why this experiment is not repeated at 90 °C. Do not include safety in your answer.
See it on the paper → - 0653/63 · October/November 2020 · Q3c[1]
Suggest one change to the procedure that would improve accuracy.
See it on the paper → - 0653/62 · May/June 2020 · Q2a(vii)[1]
Suggest one variable that the student should keep constant during this investigation.
See it on the paper → - 0653/62 · May/June 2020 · Q2b(i)[3]
On the grid, plot a graph of the average time for the disks to rise (vertical axis) and the percentage concentration of hydrogen peroxide.
See it on the paper → - 0653/62 · May/June 2020 · Q2b(ii)[1]
Draw the curve of best fit.
See it on the paper → - 0653/62 · May/June 2020 · Q2b(iii)[1]
Determine the average time for a disk to rise to the surface in a 3.7% hydrogen peroxide solution. Show on your graph how you arrived at your answer. average time = s
See it on the paper → - 0653/42 · February/March 2020 · Q4b(i)[1]
State one part of the alimentary canal where both lipase and protease are secreted.
See it on the paper →
What examiners said
Most candidates correctly stated that the rate increased as the temperature was increased. Some candidates referred to the time taken rather than rate and this was not credited. Some candidates did not include a detailed enough description of the non-linear relationship for full credit.
— Examiner report, October/November 2020, 0653/63 Q3(b)(v) (Cambridge)
Many candidates correctly stated that the time would be too short to measure. A common error was to suggest that the time taken would be less than zero or there was no need to carry on the experiment as there were already sufficient results.
— Examiner report, October/November 2020, 0653/63 Q3(b)(vi) (Cambridge)
Many candidates correctly suggested repeating the experiment and averaging the result. The most common error was suggesting whole values be used for the temperatures.
— Examiner report, October/November 2020, 0653/63 Q3(c) (Cambridge)
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