CAPE Biology Unit 1 · 2013 · Paper 2

28 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)2 marksState the nutrient being tested for, by EACH of the following tests: Biuret, Benedict's, Lugol's Iodine, Grease spot.
2. 1(a)(ii)1 markUsing the data presented in Table 1, determine TWO food substances which contain all four nutrients being tested for in this investigation.
3. 1(a)(iii)4 marksWith reference to the qualitative results given in Table 1, suggest which foods are good sources of nutrients for cell structure and growth of the cell, and for supply of energy. Justify your answer with a brief…
4. 1(b)(i)2 marksUsing a labelled arrow on Figure 1, highlight the location of EACH of the following: a) An alpha 1,4-glycosidic linkage b) An alpha 1,6-glycosidic linkage.
5. 1(b)(ii)2 marksIn the space below, sketch the general shape of one glycogen molecule. [Details of individual glucose residues are NOT required.]
6. 1(b)(iii)4 marksAmylose (starch) and cellulose are both polymers of glucose molecules but they differ in their structure and function in plant cells. With reference to ONE structural property, briefly explain the functional differences…
7. 2(a)(i)1 markState the expected ratio for the cross of the F₁ offspring.
8. 2(a)(ii)2 marksState an appropriate null (H₀) hypothesis and an appropriate alternative (H₁) hypothesis for a Chi-square test of the results.
9. 2(a)(iii)4 marksComplete Table 2 by calculating the missing values.
10. 2(a)(iv)1 markDetermine the number of degrees of freedom. Show your calculation.
11. 2(a)(v)2 marksUsing the Chi-square values in Table 3, comment on the validity of the null hypothesis stated on page 5.
12. 2(b)(i)1 markWhat is the term used to describe EACH group of three bases on the mRNA and tRNA?
13. 2(b)(ii)2 marksUsing the mRNA strand below, identify the corresponding triplet bases on the tRNA molecules. Write your answer in the boxes provided. Hint: Begin at the 5′ end. mRNA 5′ UGG UUU GGC UCA 3′
14. 2(b)(iii)2 marksOutline the nucleotide sequence on the DNA strand which serves as the template for the mRNA strand in (b) (ii).
15. 3(a)(i)3 marksComplete Table 4 with respect to the features listed for spermatogenesis and oogenesis in humans.
16. 3(a)(ii)3 marksOutline the roles of follicle-stimulating hormone (FSH) and luteinizing hormone (LH) in the regulation of spermatogenesis.
17. 3(b)6 marksIn the box below, make a plan drawing of the ovary to include the stage of the developing ovum just prior to release from the ovary.
18. 3(c)3 marksComment on the fate of the structure labelled X and the structure labelled Y, which includes the ovule walls and the embryo sac and its contents.
19. 4(a)4 marksDefine the term 'diffusion', and distinguish between active transport and facilitated diffusion in cells.
20. 4(b)(i)6 marksWith the aid of a simplified labelled diagram, describe the fluid mosaic model of membrane structure.
21. 4(b)(ii)5 marksWith reference to the fluid mosaic model, discuss how polar molecules and ions are transported.
22. 5(a)(i)6 marksApplying Darwin's theory of evolution by natural selection, discuss how resistance to antibiotics could have evolved in bacteria. Include in your discussion a concise explanation of natural selection.
23. 5(a)(ii)2 marksBriefly comment on why mutation is regarded as a driving force of evolution.
24. 5(b)7 marksDefine the term 'speciation', and using examples, explain how geographical isolation may lead to speciation.
25. 6(a)(i)5 marksGive a concise description of the key stages in the fertilization of a human secondary oocyte by a spermatozoon. Begin your account with the acrosome reaction.
26. 6(a)(ii)2 marksBriefly comment on the significance of the process of fertilization.
27. 6(b)(i)4 marksDescribe TWO major functions of the placenta.
28. 6(b)(ii)4 marksDiscuss TWO ways in which maternal behaviour can affect foetal development.