2020年11月IB生物SL真题下载-Paper2
1. A study was conducted to look at the short-term effects of a change in diet on the risk of disease in young adults. The table shows data on the habitual diet of the participants as well as the study diet followed for two weeks.
(a) Comment on the total energy content of the two diets.
(b) Distinguish between the two diets.
Total blood plasma cholesterol levels were measured before the study began and once a week after starting the study diet. Mean results are shown in the bar chart, including the standard deviation.
(c) Calculate, showing your working, the percentage change in mean cholesterol level after one week on the study diet.
Control of blood glucose concentration was investigated using an oral glucose tolerance test. For this test, the person was given a concentrated glucose drink (at time zero) and then blood samples were taken every 15 minutes to determine the plasma insulin level. This test was done before the study diet and after two weeks on the study diet. Mean results are shown in the graph, including the standard deviation.
(d) (i) Compare the data for plasma insulin levels before and after the study diet.
(ii) State which cells secrete insulin.
(iii) Outline the reason for plasma insulin levels changing in the first 30 minutes of the test.
(e) The hypothesis made before the study was that saturated fats in the diet affected the risk of coronary artery blockage and diabetes. Using all the data in question 1, evaluate whether this hypothesis is supported by the study.
2020年11月IB生物SL真题余下省略！
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