CAPE Biology Unit 1 · 2006 · Paper 2

36 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)5 marksComplete Table 1 by describing the testing procedures the students use; and state the type of food molecule found (if any).
2. 1(b)1 markSuggest THREE food items you would purchase from the supermarket to make this dessert.
3. 1(c)(i)2 marksDraw a phospholipid molecule accurately.
4. 1(c)(ii)2 marksDraw a portion of a cellulose molecule containing three glucose units accurately.
5. 2(a)(i)2 marksIllustrate ONE pair of homologous chromosomes aligning themselves. Illustrate ONE cross-over between two of the chromatids.
6. 2(a)(ii)2 marksDraw early anaphase of meiosis I, showing the exchanged chromatid material. (Shade appropriately).
7. 2(b)2 marksWith reference to Figure 2 above, complete Table 2 to show which areas of the sex chromosomes can cross over to form chiasmata. (Place a tick (√) in the appropriate column).
8. 2(c)2 marksState TWO ways in which the process of meiosis contributes towards the variation of the gametes.
9. 2(d)2 marksPlace a tick (√) in the column which shows the amount of DNA present at the stage of meiosis listed.
10. 3(a)4 marksUsing distinguishing features of these reptiles, construct a set of dichotomous keys to assist in their identification.
11. 3(b)2 marksState THREE types of selection mentioned in the paragraph, and for EACH type, paraphrase a sentence from the passage to describe it.
12. 4(a)10 marksDescribe the structural features of a typical plant cell and point out the features of contrast shown in animal cells.
13. 4(b)6 marksElaborate on the differences between prokaryotic cells and eukaryotic cells.
14. 4(c)4 marksProvide arguments in support of the endosymbiont theory.
15. 5(a)4 marksWith reference to the structure of enzymes, distinguish between competitive and non-competitive enzyme inhibition.
16. 5(b)6 marksDescribe the steps involved in an enzyme-catalysed reaction. In your description, make reference to the active site of an enzyme-substrate complex, lowering of the activation energy and enzyme specificity.
17. 5(c)(i)2 marksGiving ONE reason, predict the effect that baking the bread over 110°C will have on enzyme activity.
18. 5(c)(ii)2 marksGiving ONE reason, predict the effect that the addition of these bicarbonate ions will have on pepsin action as the stomach contents pass into the duodenum.
19. 5(c)(iii)2 marksGiving ONE reason, predict the effect that the new weight of xylanase will have on the clarification process.
20. 5(c)(iv)2 marksGiving ONE reason, predict the effect that this shortage will have on the clarification process.
21. 5(c)(v)2 marksGiving ONE reason, predict what would occur if xylanase were used to clarify fresh sugar cane juice.
22. 6(a)(i)6 marksExplain how the sequence of nucleotides in the DNA molecule is related to the sequence of nucleotides in the RNA molecule.
23. 6(a)(ii)5 marksExplain how the sequence of nucleotides in the DNA molecule is related to the order in which the t-RNA molecules align specific amino acids.
24. 6(b)(i)5 marksHow is the precise and accurate folding of globular proteins influenced by the organism's DNA?
25. 6(b)(ii)4 marksHow is the erroneous formation of haemoglobins in sickle-cell anaemia influenced by the organism's DNA?
26. 7(a)10 marksDescribe the structure of the anther and the way in which pollen grains are formed within it.
27. 7(b)5 marksName the type of fertilisation exhibited by EACH of the following plants and briefly explain the mechanism being used: In the flower Chamaenerion angustifolia, the stamens and carpels reach maturity at different times.…
28. 7(c)5 marksDiscuss the advantages and disadvantages of each type of reproduction in these plants.
29. 8(a)(i)2 marksWhat is meant by the term 'Gene'?
30. 8(a)(ii)2 marksWhat is meant by the term 'Allele'?
31. 8(b)8 marksExplain the operation of multiple alleles in the ABO Blood Grouping System in humans and use genetic diagrams to show how parents with A (mother) and B (father) blood types may produce a family with all four types of…
32. 8(c)(i)4 marksWhat are sex chromosomes and how do they control the inheritance of sex?
33. 8(c)(ii)6 marksWith the aid of a genetic diagram, explain sex linkage, showing how it is possible for a normal sighted woman and a normal sighted man to have colour-blind sons.
34. 9(a)10 marksDescribe the five-kingdom classification system and discuss the principles and importance of modern classification systems.
35. 9(b)5 marksSuggest the procedure for classifying the new plant.
36. 9(c)5 marksDiscuss the importance of conserving biodiversity.