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Students investigated the activity of the enzyme lipase for a practical investigation - VCE - SSCE Biology - Question 11 - 2019 - Paper 1
Question 11
Students investigated the activity of the enzyme lipase for a practical investigation. Student 1 made the following notes before designing her experiment. Lipase ca... show full transcript
Worked Solution & Example Answer:Students investigated the activity of the enzyme lipase for a practical investigation - VCE - SSCE Biology - Question 11 - 2019 - Paper 1
Step 1
Analyse the data above and state the temperature at which the measurements are the most precise.
Answer
Looking at the results from Student 1, we can evaluate the precision of the measurements. Precision refers to the consistency of the measurements across trials at a certain temperature.
- For 5 °C, the measurements are 240, 238, and 241 seconds, which shows a range of 3 seconds.
- For 15 °C, the measurements are 229, 230, and 226 seconds, showing a range of 4 seconds.
- For 25 °C, the measurements are 200, 201, and 202 seconds, with a range of 2 seconds.
- For 35 °C, the measurements are 180, 181, and 180 seconds, which shows a range of 1 second.
From this analysis, it is clear that 35 °C has the least variation in measurements, making it the most precise temperature.
Step 2
Justify your response.
Answer
The justification for stating that 35 °C is the most precise temperature includes observing the smallest range (1 second) among the trials, indicating that the readings are closely clustered together. This consistency demonstrates that at 35 °C, the results are reliable and exhibit minimal variability, ultimately implying a greater level of precision in the measurements taken.