CAPE Biology Unit 1 · 2007 · Paper 2

42 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)3 marksWhat conclusions can you draw about the contents of the solutions? X: Y:
2. 1(a)(ii)2 marksBriefly explain the colour change recorded for Solution X when treated with Benedict's solution.
3. 1(b)4 marksSuggest how you would determine the concentration of the substance in Solution X if given additional samples.
4. 1(c)1 markHow would you determine the presence of lipid in a liquid foodstuff, using a test-tube based method?
5. 2(a)6 marksIn the spaces provided make representative drawings of the cells and nuclear contents showing the stages labelled in Figure 1 as A and B. Drawings should be at X3. Identify the stages drawn. A Identity B Identity
6. 2(b)2 marksState the procedures involved in making a slide preparation of an onion root tip to examine mitosis.
7. 2(c)2 marksState FOUR locations (other than the root tip) where mitosis occurs in plants.
8. 3(a)2 marksComplete Table 2 below to show which number on Figure 2 matches EACH kingdom indicated.
9. 3(b)(i)3 marksFor EACH kingdom, state the features used to discriminate between them. Prokaryotes from the other four kingdoms Feature
10. 3(b)(ii)1 markAnimals from plants Feature 1 Feature 2
11. 3(b)(iii)1 markFungi from plants Feature 1 Feature 2
12. 3(b)(iv)1 markProtoctists from the animal, plant and fungus kingdoms. Feature
13. 3(c)5 marksIn order to assist in identifying them, create a set of paired dichotomous keys. Use the space below to create the dichotomous keys.
14. 4(a)2 marksExplain what is meant by the term 'tertiary structure of a protein'.
15. 4(b)(i)1 markDraw a large labelled diagram to illustrate the structure of the haemoglobin molecule.
16. 4(b)(ii)8 marksState the main function of haemoglobin and explain how the structure is related to the function given.
17. 4(c)10 marksDiscuss the factors which affect enzyme activity.
18. 5(a)6 marksDescribe the structure of the membrane of a typical cell, and identify its component parts and their biochemical nature.
19. 5(b)(i)8 marksEntry of useful minerals, such as potassium
20. 5(b)(ii)1 markAbsorption of large molecules by endocytosis
21. 5(b)(iii)1 markEntry of non-ionic molecules such as sucrose
22. 5(b)(iv)1 markPrevention of entry of toxic molecules such as copper or lead
23. 5(c)6 marksWhen strips of potato tissue are immersed in distilled water for two hours, they increase in length and become turgid. Relate this outcome to the exact causes and processes occurring in the cells of the tissue.
24. 6(a)(i)10 marksDescribe the structure of the DNA molecule.
25. 6(a)(ii)1 markOutline how the structure of RNA differs from that of DNA.
26. 6(b)10 marksDiscuss how changes in the nucleotide sequence of DNA can result in changes in the structure and functioning of erythrocytes in sickle cell anaemia.
27. 7(a)(i)10 marksGive a detailed, labelled drawing of a section of the placenta to show the relative positions of the umbilical cord and blood vessels, the villi, uterine wall, maternal blood spaces and maternal blood vessels (inclusion…
28. 7(a)(ii)1 markIn the umbilical cord use arrows to show the direction of blood flow and indicate which blood is oxygenated or deoxygenated.
29. 7(b)(i)10 marksThe function of the amnion
30. 7(b)(ii)1 markThe effects of the foetus on the mother
31. 7(b)(iii)1 markThe lifestyle requirements of the mother for healthy foetal development
32. 8(a)(i)14 marksExplain the nature of inheritance of the allele for haemophilia.
33. 8(a)(ii)1 markExplain why none of Queen Victoria's female offsprings were haemophiliacs.
34. 8(a)(iii)1 markDraw a genetic diagram to show the inheritance of the haemophilia allele in the children of Leopold Duke of Albany.
35. 8(a)(iv)1 markExplain the inheritance of the human ABO blood group.
36. 8(b)6 marksClarify the sequential steps to be taken when using the Chi-squared test to determine the significance of the results. The formula for conducting a Chi-squared test is X² = Σ(O-E)²/E
37. 9(a)(i)6 marksDefine the term 'environment', and explain the influence of ONE physical factor and ONE biotic factor, on the environment.
38. 9(a)(ii)1 markDefine the term 'evolution', and explain the difference between the terms 'allopatric' and 'sympatric'.
39. 9(b)4 marksGive FOUR reasons for the importance of maintaining biodiversity on earth.
40. 9(c)(i)8 marksStabilizing selection
41. 9(c)(ii)1 markDirectional selection
42. 9(d)2 marks"Disruptive selection is closely associated with speciation." Comment on this statement.