How does changing the pH level (4, 6, 7, 8, 9, 10 ± 0.1) affect the activity of trypsin in breaking down casein as measured by the time taken (in seconds ± 1 sec) for the black cross to become clearly visible at 25°C?SL
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7
Official IB Result
IB Grade: 7
Criteria A: Research Design
5/6
0
3
6
Criteria StrandsPro
A.1Research question context
Excellent
A.2Methodological considerations
Moderate
A.3Methodology description
Poor
Criteria Feedback
- The student's research question is focused, quantitative, and clearly anchored in a specific biological system.
- The student controls several important variables and explains why they matter to the investigation.
- The student's method follows a sensible overall sequence that another person could follow with only a few clarifications.
- Some key details are missing, especially concentrations and the exact preparation of solutions.
- The pH control is not explained with enough precision, particularly after trypsin is added.
- The endpoint needs a more objective definition so another investigator can reproduce it consistently.
Criteria B: Data Analysis
5/6
0
3
6
Criteria StrandsPro
B.1Communication of data recording and processing
Good
B.2Consideration of uncertainties
Good
B.3Data processing quality
Excellent
Criteria Feedback
- The student's raw and processed data are organised clearly and are easy to follow.
- The student uses repeated trials, means, standard deviations, and error bars to summarise the pattern in the results.
- The student's processing of time into reciprocal rate values is appropriate for comparing enzyme activity across pH values.
- Some uncertainty treatment is not precise enough, especially where the student reports mean values with an oversimplified uncertainty.
- The processing steps should be shown more explicitly so the reader can check the calculations.
- The student's statistical interpretation would be stronger if they linked the test more carefully to the form of data analysed and the assumptions behind it.
Criteria C: Conclusion
4/6
0
3
6
Criteria StrandsPro
C.1Conclusion relevance and consistency
Excellent
C.2Scientific context comparison
Moderate
Criteria Feedback
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- Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
Criteria D: Evaluation
6/6
0
3
6
Criteria StrandsPro
D.1Methodological weaknesses
Good
D.2Improvements
Good
Criteria Feedback
- Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
- Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
- Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.
- Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.