CAPE Biology Unit 1 · 2017 · Paper 2

29 questions and parts from this paper. Open one to see it in full, then practise it on Quelpr and get it marked against the mark scheme.

1. 1(a)(i)6 marksIn the box below, make a detailed drawing of the cell in Figure 1 and label FOUR structures seen in the cell.
2. 1(a)(ii)2 marksUsing the magnification provided, calculate the actual size of the cell, highlighted by the bar line at the left of the image. State the calculated value to the nearest micrometer. Show your working.
3. 1(b)(i)1 markSuggest a hypothesis for this experiment.
4. 1(b)(ii)3 marksCompare the results obtained for the amount of reducing sugar and starch in the banana samples. Include in your comparison reference to the observations recorded.
5. 1(b)(iii)2 marksComment on the significance of the findings of this experiment in relation to the use of bananas as a food item.
6. 1(b)(iv)1 markState the purpose of testing a sample with no banana extract.
7. 2(a)(i)2 marksState the genotypes of the following: A normal clotting male; A normal clotting carrier female.
8. 2(a)(ii)3 marksUsing the genotypes stated in (i) as parental genotypes, construct a Punnett square diagram to show how haemophilia-affected offspring can result from normal clotting parents. State the phenotype of all offspring.
9. 2(a)(iii)1 markGive an explanation as to why a man with haemophilia cannot pass on the condition to his son.
10. 2(b)(i)1 markState the null hypothesis for this test.
11. 2(b)(ii)2 marksCalculate Chi-square using the formula, Chi-square = Σ(Ο - E)²/E, where O is the observed and E the expected number of plants. Show your working in tabular form as follows.
12. 2(b)(iii)2 marksUse the data in Table 2 on page 10 to make an inference based on your calculated Chi-square value.
13. 2(c)(i)1 markUsing the axes provided in Figure 3, illustrate the effect of disruptive selection on the population distribution in Figure 2.
14. 2(c)(ii)3 marksUsing Darwin's theory of natural selection, explain how disruptive selection can lead to the formation of new species.
15. 3(a)(i)4 marksOn the grid provided in Figure 4, plot line graphs for the data given in Table 3.
16. 3(a)(ii)2 marksBriefly describe the overall trend for the effect of different sucrose concentrations, in both culture media, on the germination rate of the palm pollen.
17. 3(a)(iii)2 marksBased on the results shown in Table 3, what can be deduced about the effect of the type of culture medium on the maximum rate of pollen germination?
18. 3(b)(i)3 marksIdentify and describe the main function of EACH of the structures labelled I, II and III.
19. 3(b)(ii)2 marksComment on TWO roles of the structure labelled Y in the development of the foetus.
20. 3(b)(iii)2 marksOutline TWO ways in which the placenta acts as a protective barrier for the developing foetus.
21. 4(a)(i)4 marksCompare the cell size and THREE structural features of prokaryotic and eukaryotic cells.
22. 4(a)(ii)5 marksOutline the endosymbiont theory for the origin of eukaryotic cells. Explain how characteristics of mitochondria and chloroplasts provide evidence in support of this theory.
23. 4(b)6 marksDiscuss the importance of protein structure for determining enzyme specificity and mode of action.
24. 5(a)5 marksDescribe the roles of DNA and RNA in protein synthesis.
25. 5(b)(i)5 marksOutline the principle of genetic engineering, including a brief description of the basic steps of this technique.
26. 5(b)(ii)5 marksDespite its promising potential, one of the arguments sometimes raised against the use of gene therapy is that it is technically too dangerous. With reference to cystic fibrosis, discuss reasons for this viewpoint.
27. 6(a)5 marksGiving examples, discuss TWO advantages of vegetative propagation of plants.
28. 6(b)4 marksDiscuss TWO genetic consequences of sexual reproduction.
29. 6(c)6 marksDescribe the development of fruit and seed structures from floral structures after fertilization.