CAPE Biology Unit 1 · 2016 · Paper 2

23 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 marksName the reaction labelled R and the reaction product labelled X in Figure 1.
2. 1(a)(ii)2 marksIn the box below, illustrate the full molecular ring structure of the glucose molecule involved in the reaction in Figure 1.
3. 1(a)(iii)3 marksWith reference to the molecular structure of sucrose, explain why sucrose has an advantage over glucose as a transport sugar in plants.
4. 1(b)(i)5 marksDraw a simple labelled diagram to illustrate the fluid mosaic model of plasma membrane structure.
5. 1(b)(ii)3 marksWith reference to the fluid mosaic model, explain how large polar molecules can pass through the membrane.
6. 2(a)(i)5 marksUsing a simplified diagram of a small section of ribonucleic acid (RNA), describe the structure of RNA. Note: Details of the chemical composition of components are NOT required.
7. 2(a)(ii)2 marksComment on the role of m-RNA in eukaryotes.
8. 2(b)(i)2 marksDetermine the genotype of EACH phenotypic category in Table 1, using the symbols given. Write your answers in Table 1.
9. 2(b)(ii)2 marksSuggest a null hypothesis for the test cross in (b).
10. 2(b)(iii)2 marksComplete Table 2 by writing the missing values in the relevant spaces.
11. 2(b)(iv)2 marksUsing the table of probabilities provided below, and with reference to the calculated Chi-square value from Table 2, evaluate the validity of the hypothesis.
12. 3(a)6 marksIn the box below, make a plan drawing of the anther in Figure 2. Use annotated labels to identify TWO tissues.
13. 3(b)(i)3 marksIdentify the structures labelled A, B and C and indicate whether EACH is of foetal or maternal origin. Write your answers in the following table.
14. 3(b)(ii)2 marksOutline TWO functions of the placenta.
15. 3(b)(iii)4 marksComment on the importance of the amnion during foetal development. In your comment, give TWO effects of reduced levels of the amniotic fluid.
16. 4(a)(i)3 marksExplain what is meant by the term 'endosymbiosis' and how it relates to the origin of these organelles in eukaryotes.
17. 4(a)(ii)6 marksDiscuss THREE lines of evidence in support of this theory.
18. 4(b)6 marksEnzymes are globular proteins and are highly specific in the reactions catalysed. Explain the basis of enzyme specificity and include in your explanation a brief description of the globular nature of these molecules.
19. 5(a)7 marksEvaluate the use of genetically modified organisms in agriculture. Include an explanation of the term 'genetically modified organism'.
20. 5(b)8 marksExplain the steps involved in the use of recombinant DNA technology for the production of human insulin from bacteria under the following headings: Gene isolation; Gene insertion into a vector.
21. 6(a)(i)5 marksUsing an example with which you are familiar, give an account of the process involved in this type of asexual reproduction.
22. 6(a)(ii)3 marksFungi can also produce offspring by sexual reproduction. Discuss the conditions under which asexual reproduction is more advantageous than sexual reproduction.
23. 6(b)7 marksGonadal hormones coordinate activities of the ovary and uterus in human females. Give a brief description of the THREE main phases in the uterine cycle and for EACH phase, comment on the role of gonadal hormones.…