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Aspects of Biochemistry · CAPE Biology Unit 1

159 past-paper questions on Aspects of Biochemistry, part of Cell and Molecular Biology, from every CAPE Biology Unit 1 paper on Quelpr.

Practise Aspects of Biochemistry
  1. 1(a)4 marks· Biology · Unit 1 Q1 1(a)Complete the format below with the appropriate information in each square.
  2. 1(a)3 marks· Biology · Unit 1 Q1 1(a)Complete Table 1 by writing the missing information in the spaces provided.
  3. 1(a)4 marks· Biology · Unit 1 Q1 1(a)In the space below, draw AND label the chemical structure of a typical phospholipid molecule, clearly indicating its THREE major components. Label the hydrophilic and hydrophobic parts of the molecule.
  4. 1(a)5 marks· Biology · Unit 1 Q1 1(a)Complete Table 1 by describing the testing procedures the students use; and state the type of food molecule found (if any).
  5. 1(a)(i)2 marks· Biology · Unit 1 Q1 1(a)(i)State the nutrient being tested for, by EACH of the following tests: Biuret, Benedict's, Lugol's Iodine, Grease spot.
  6. 1(a)(i)1 mark· Biology · Unit 1 Q1 1(a)(i)Primary structure
  7. 1(a)(i)2 marks· Biology · Unit 1 Q1 1(a)(i)Using an α-1-6 linkage, attach a third glucose molecule in Figure 1.
  8. 1(a)(i)2 marks· Biology · Unit 1 Q1 1(a)(i)List FOUR main functions of proteins in living organisms.
  9. 1(a)(i)3 marks· Biology · Unit 1 Q1 1(a)(i)What conclusions can you draw about the contents of the solutions? X: Y:
  10. 1(a)(i)2 marks· Biology · Unit 1 Q1 1(a)(i)Name the reaction labelled R and the reaction product labelled X in Figure 1.
  11. 1(a)(ii)2 marks· Biology · Unit 1 Q1 1(a)(ii)In the box below, illustrate the full molecular ring structure of the glucose molecule involved in the reaction in Figure 1.
  12. 1(a)(ii)2 marks· Biology · Unit 1 Q1 1(a)(ii)Secondary structure
  13. 1(a)(ii)1 mark· Biology · Unit 1 Q1 1(a)(ii)Name ONE example of a carbohydrate that is made up of components with BOTH an α-1-4 glycosidic linkage and an α-1-6 linkage.
  14. 1(a)(ii)1 mark· Biology · Unit 1 Q1 1(a)(ii)Using the data presented in Table 1, determine TWO food substances which contain all four nutrients being tested for in this investigation.
  15. 1(a)(ii)2 marks· Biology · Unit 1 Q1 1(a)(ii)Briefly explain the colour change recorded for Solution X when treated with Benedict's solution.
  16. 1(a)(ii)1 mark· Biology · Unit 1 Q1 1(a)(ii)Circle a peptide bond in the structure in Figure 1.
  17. 1(a)(iii)2 marks· Biology · Unit 1 Q1 1(a)(iii)Tertiary structure
  18. 1(a)(iii)3 marks· Biology · Unit 1 Q1 1(a)(iii)With reference to the molecular structure of sucrose, explain why sucrose has an advantage over glucose as a transport sugar in plants.
  19. 1(a)(iii)1 mark· Biology · Unit 1 Q1 1(a)(iii)Distinguish between an 'α glycosidic linkage' and a 'β linkage'.
  20. 1(a)(iii)2 marks· Biology · Unit 1 Q1 1(a)(iii)In the boxes below, draw the structure of a) an amino group and b) a carboxyl group.
  21. 1(a)(iii)4 marks· Biology · Unit 1 Q1 1(a)(iii)With 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…
  22. 1(a)(iv)2 marks· Biology · Unit 1 Q1 1(a)(iv)Quaternary structure
  23. 1(a)(iv)2 marks· Biology · Unit 1 Q1 1(a)(iv)Comment on the difference in function between a carbohydrate with α linkages and a carbohydrate with β linkages.
  24. 1(b)1 mark· Biology · Unit 1 Q1 1(b)Suggest THREE food items you would purchase from the supermarket to make this dessert.
  25. 1(b)1 mark· Biology · Unit 1 Q1 1(b)Draw the structural formula for each fatty acid.
  26. 1(b)4 marks· Biology · Unit 1 Q1 1(b)Suggest how you would determine the concentration of the substance in Solution X if given additional samples.
  27. 1(b)3 marks· Biology · Unit 1 Q1 1(b)With reference to its protein structure, explain how the haemoglobin molecule functions in its essential role.
  28. 1(b)(i)2 marks· Biology · Unit 1 Q1 1(b)(i)Structural formula for fatty acid No. 1.
  29. 1(b)(i)1 mark· Biology · Unit 1 Q1 1(b)(i)Suggest a hypothesis for this experiment.
  30. 1(b)(i)2 marks· Biology · Unit 1 Q1 1(b)(i)Using 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.
  31. 1(b)(i)2 marks· Biology · Unit 1 Q1 1(b)(i)Describe the α helix bond in keratin.
  32. 1(b)(ii)2 marks· Biology · Unit 1 Q1 1(b)(ii)Structural formula for fatty acid No. 2.
  33. 1(b)(ii)3 marks· Biology · Unit 1 Q1 1(b)(ii)Compare the results obtained for the amount of reducing sugar and starch in the banana samples. Include in your comparison reference to the observations recorded.
  34. 1(b)(ii)2 marks· Biology · Unit 1 Q1 1(b)(ii)In the space below, sketch the general shape of one glycogen molecule. [Details of individual glucose residues are NOT required.]
  35. 1(b)(ii)2 marks· Biology · Unit 1 Q1 1(b)(ii)Comment on TWO differences in physical properties of these proteins. Write your answer in the table below.
  36. 1(b)(iii)2 marks· Biology · Unit 1 Q1 1(b)(iii)Comment on the significance of the findings of this experiment in relation to the use of bananas as a food item.
  37. 1(b)(iii)4 marks· Biology · Unit 1 Q1 1(b)(iii)Amylose (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…
  38. 1(b)(iii)2 marks· Biology · Unit 1 Q1 1(b)(iii)Identify the TWO bonds labelled A and B as shown in Figure 2.
  39. 1(b)(iv)1 mark· Biology · Unit 1 Q1 1(b)(iv)State the purpose of testing a sample with no banana extract.
  40. 1(c)1 mark· Biology · Unit 1 Q1 1(c)How would you determine the presence of lipid in a liquid foodstuff, using a test-tube based method?
  41. 1(c)2 marks· Biology · Unit 1 Q1 1(c)Identify the structures labelled A and B in Figure 1.
  42. 1(c)2 marks· Biology · Unit 1 Q1 1(c)State TWO advantages which animals derive from using fat as a storage material other than energy content, in preference to starch.
  43. 1(c)(i)2 marks· Biology · Unit 1 Q1 1(c)(i)Draw a phospholipid molecule accurately.
  44. 1(c)(ii)2 marks· Biology · Unit 1 Q1 1(c)(ii)Draw a portion of a cellulose molecule containing three glucose units accurately.
  45. 1(c)(ii)1 mark· Biology · Unit 1 Q1 1(c)(ii)Label an ester linkage in the triglyceride shown in Figure 1.
  46. 1(c)(iii)1 mark· Biology · Unit 1 Q1 1(c)(iii)State ONE feature of the triglyceride molecule that enables it to function as a better energy store than carbohydrates.
  47. 1(e)(i)1 mark· Biology · Unit 1 Q1 1(e)(i)Identify the class of lipids to which the biomolecule in Figure 1 belongs.
  48. 1(e)(ii)2 marks· Biology · Unit 1 Q1 1(e)(ii)Explain how TWO features of the biomolecule in Figure 1 are related to its function in animal tissues.
  49. 3(c)1 mark· Biology · Unit 1 Q3 3(c)List the SEVEN categories used in modern classification, starting with the broadest and proceeding to the narrowest category.
  50. 4(a)5 marks· Biology · Unit 1 Q4 4(a)Outline the structure of a molecule of water and explain how this structure allows water to be an excellent solvent.
  51. 4(a)10 marks· Biology · Unit 1 Q4 4(a)State briefly what is meant by the primary, secondary, tertiary and quaternary structure of proteins. Exemplify EACH answer by reference to the protein molecule, collagen.
  52. 4(a)2 marks· Biology · Unit 1 Q4 4(a)Explain what is meant by the term 'tertiary structure of a protein'.
  53. 4(a)3 marks· Biology · Unit 1 Q4 4(a)By means of a diagram, show the molecular structure of sucrose. Show the position of the oxygen and all other groups, EXCEPT for the H,OH groups on the No. 2, 3 and 4 carbons of glucose, and the 1, 3 and 4 carbons of…
  54. 4(a)(i)4 marks· Biology · Unit 1 Q4 4(a)(i)With the aid of an annotated diagram, describe the structure of phospholipids.
  55. 4(a)(i)6 marks· Biology · Unit 1 Q4 4(a)(i)With reference to the levels of structural organization and types of bonds, describe the structure of the protein, collagen. (No diagrams are required.)
  56. 4(a)(i)5 marks· Biology · Unit 1 Q4 4(a)(i)With the aid of a simple diagram, describe the basic structure of a phospholipid. Detailed chemical formulae of the molecules are not required.
  57. 4(a)(ii)2 marks· Biology · Unit 1 Q4 4(a)(ii)Explain ONE functional property of collagen which makes it suitable as a major component of tendons and ligaments.
  58. 4(b)4 marks· Biology · Unit 1 Q4 4(b)Discuss TWO major roles of water in cell function.
  59. 4(b)6 marks· Biology · Unit 1 Q4 4(b)The structure of collagen confers special properties which reflect its distribution in the body. Comment on this statement.
  60. 4(b)6 marks· Biology · Unit 1 Q4 4(b)Using a generalized structure for amino acids, outline the process of formation of a peptide bond between two amino acids. Explain, using an example, how amino acids differ from each other.
  61. 4(b)(i)4 marks· Biology · Unit 1 Q4 4(b)(i)Relate the structure of the water molecule to its solvent properties.
  62. 4(b)(i)1 mark· Biology · Unit 1 Q4 4(b)(i)Draw a large labelled diagram to illustrate the structure of the haemoglobin molecule.
  63. 4(b)(ii)4 marks· Biology · Unit 1 Q4 4(b)(ii)Relate the structure of the water molecule to its high surface tension.
  64. 4(b)(ii)8 marks· Biology · Unit 1 Q4 4(b)(ii)State the main function of haemoglobin and explain how the structure is related to the function given.
  65. 5(a)10 marks· Biology · Unit 1 Q5 5(a)Describe the structure of glucose, starch and cellulose and explain how these compounds function in living organisms.
  66. 5(b)5 marks· Biology · Unit 1 Q5 5(b)Discuss how the properties of water have enabled EACH goldfish to survive in the contrasting conditions.
  67. 5(c)5 marks· Biology · Unit 1 Q5 5(c)Using a comparison of the way fats and carbohydrates interact with water, suggest why fat is the BETTER energy storage material for the humming bird.
  68. 8(a)10 marks· Biology · Unit 1 Q8 8(a)Explain how in situ and ex situ conservation methods can be used to maintain biodiversity.
  69. 8(c)5 marks· Biology · Unit 1 Q8 8(c)Outline FIVE ecological factors that should be evaluated before determining the size and location of reserves?
  70. 9(a)10 marks· Biology · Unit 1 Q9 9(a)Give an account of FIVE methods that may be used to conserve useful or valuable species.
  71. 9(a)10 marks· Biology · Unit 1 Q9 9(a)Describe the five-kingdom classification system and discuss the principles and importance of modern classification systems.
  72. 9(b)5 marks· Biology · Unit 1 Q9 9(b)Suggest the procedure for classifying the new plant.
  73. 9(b)(i)6 marks· Biology · Unit 1 Q9 9(b)(i)Discuss the principles on which the Five Kingdom system is based.
  74. 9(b)(ii)4 marks· Biology · Unit 1 Q9 9(b)(ii)Comment on the difficulties of classifying members of the Proctoctista (Protist Kingdom).
  75. 9(c)5 marks· Biology · Unit 1 Q9 9(c)Discuss the importance of conserving biodiversity.
  76. Q11 mark · multiple choice· CAPE Biology Unit 1 · 2007 · Paper 1One of the roles of water in living organisms is that it acts as a transport medium in blood. Which of the following properties of water accounts for this role?
  77. Q21 mark · multiple choice· CAPE Biology Unit 1 · 2007 · Paper 1The diagram below shows a ring structure of glucose. Which of the following indicates the form of glucose and in which molecule it is present?
  78. Q31 mark · multiple choice· CAPE Biology Unit 1 · 2007 · Paper 1This figure below is part of a growing polysaccharide chain. The name of the bond labelled X is
  79. Q41 mark · multiple choice· CAPE Biology Unit 1 · 2007 · Paper 1The diagram below shows the structure of a triglyceride. Which of the following represents the bond labelled X?
  80. Q51 mark · multiple choice· CAPE Biology Unit 1 · 2007 · Paper 1Which of the following correctly names the type of bond represented by the broken line (---) in the diagram above?
  81. Q61 mark · multiple choice· CAPE Biology Unit 1 · 2007 · Paper 1Food tests were carried out on four different solutions. Which of the following combinations shows the solutions that contained only starch and sucrose?
  82. Q371 mark · multiple choice· CAPE Biology Unit 1 · 2007 · Paper 1Which of the above represents the genus to which the green monkey belongs?
  83. Q431 mark · multiple choice· CAPE Biology Unit 1 · 2007 · Paper 1Which of the following is an example of in situ conservation of an endangered species?
  84. Q441 mark · multiple choice· CAPE Biology Unit 1 · 2007 · Paper 1Which of the following is NOT a conservation aim when zoos are established?
  85. Q21 mark · multiple choice· CAPE Biology Unit 1 · 2007 (Specimen) · Paper 1Item 2 refers to the diagram below. The 3-unit molecular structure shown above is found in which of the following polymers?
  86. Q31 mark · multiple choice· CAPE Biology Unit 1 · 2007 (Specimen) · Paper 1Which of the following numbers represent the correct number of fatty acid residues normally present in a phospholipid molecule?
  87. Q41 mark · multiple choice· CAPE Biology Unit 1 · 2007 (Specimen) · Paper 1Item 4 refers to the amino acid alanine which has the following molecular formula. Which of the following functional groups must combine to form a peptide bond?
  88. Q51 mark · multiple choice· CAPE Biology Unit 1 · 2007 (Specimen) · Paper 1Which of the following types of bonds is responsible for stabilizing the secondary structure of a protein?
  89. Q61 mark · multiple choice· CAPE Biology Unit 1 · 2007 (Specimen) · Paper 1Which of the following molecules shows the characteristics listed below? I. The triple helices are linked by covalent cross links. II. They are polypeptides in the form of three helices. III. Every third amino acid in…
  90. Q161 mark · multiple choice· CAPE Biology Unit 1 · 2007 (Specimen) · Paper 1Item 16 refers to the following diagram. Which of the following molecules contains the monosaccharide shown above?
  91. Q411 mark · multiple choice· CAPE Biology Unit 1 · 2007 (Specimen) · Paper 1Which of the following sequences illustrates the correct hierarchical order for the classification of living things?
  92. Q421 mark · multiple choice· CAPE Biology Unit 1 · 2007 (Specimen) · Paper 1Item 42 refers to the following classification scheme illustrating taxonomic levels. Animalia Chordata Mammalia Rodentia Muroidea Rattus rattus Which of the following is the correct name for the family to which this…
  93. Q441 mark · multiple choice· CAPE Biology Unit 1 · 2007 (Specimen) · Paper 1In which of the following taxonomic groups will all the organisms be MOST similar to each other?
  94. Q451 mark · multiple choice· CAPE Biology Unit 1 · 2007 (Specimen) · Paper 1Ex situ conservation methods for plants could be practised by all of the following methods EXCEPT
  95. Q11 mark · multiple choice· CAPE Biology Unit 1 · 2008 (Rest of Region) · Paper 1Which of the following bonds between the molecules enables water to exist as a liquid rather than a gas at normal temperatures?
  96. Q21 mark · multiple choice· CAPE Biology Unit 1 · 2008 (Rest of Region) · Paper 1Item 2 refers to the structures below which show two isomers of glucose. Which of the following statements is true about BOTH isomers?
  97. Q31 mark · multiple choice· CAPE Biology Unit 1 · 2008 (Rest of Region) · Paper 1Phospholipids will affect the function of which of the following cell structures? I. Endoplasmic reticulum II. Centrioles III. Mitochondrion IV. Nucleolus
  98. Q41 mark · multiple choice· CAPE Biology Unit 1 · 2008 (Rest of Region) · Paper 1Item 4 refers to the following chemical structure of a molecule. Which of the following is the molecule represented by the structure?
  99. Q51 mark · multiple choice· CAPE Biology Unit 1 · 2008 (Rest of Region) · Paper 1Collagen consists of three polypeptide chains held together by H-bonds - NH groups and -CO- groups. Which of the following terms describes the structure of collagen?
  100. Q61 mark · multiple choice· CAPE Biology Unit 1 · 2008 (Rest of Region) · Paper 1Item 6 refers to tests performed by students to identify food substances present in a solution. The tests were carried out and their respective results are shown in the table below. \begin{tabular}{|l|l|} \hline…
  101. Q11 mark · multiple choice· CAPE Biology Unit 1 · 2009 · Paper 1Sucrose makes a good transport molecule as seen in phloem tissue, because it is a
  102. Q21 mark · multiple choice· CAPE Biology Unit 1 · 2009 · Paper 1Which of the following statements is NOT true about both isomers?
  103. Q31 mark · multiple choice· CAPE Biology Unit 1 · 2009 · Paper 1An important property of cellulose is its ability to
  104. Q41 mark · multiple choice· CAPE Biology Unit 1 · 2009 · Paper 1The arrangement of the polypeptide strands in collagen is BEST described as
  105. Q51 mark · multiple choice· CAPE Biology Unit 1 · 2009 · Paper 1Which of the following indicates the food substance(s) present in the students' solution?
  106. Q61 mark · multiple choice· CAPE Biology Unit 1 · 2009 · Paper 1The following is a diagrammatical representation of a phospholipid molecule. What do X, Y and Z represent?
  107. Q151 mark · multiple choice· CAPE Biology Unit 1 · 2009 · Paper 1Which of the following is represented by the label X?
  108. Q11 mark · multiple choice· CAPE Biology Unit 1 · 2010 · Paper 1Which of the following bonds between the molecules enables water to exist as a liquid rather than a gas at normal room temperature?
  109. Q21 mark · multiple choice· CAPE Biology Unit 1 · 2010 · Paper 1Item 2 refers to the diagram below which shows a ring structure of glucose. Which of the following indicates the form of glucose and the molecule in which it is present?
  110. Q31 mark · multiple choice· CAPE Biology Unit 1 · 2010 · Paper 1Carbohydrates are transported in plants MAINLY in the form of
  111. Q41 mark · multiple choice· CAPE Biology Unit 1 · 2010 · Paper 1Item 4 refers to the chemical structure of the molecule shown below: The molecule represented in the structure above is a
  112. Q51 mark · multiple choice· CAPE Biology Unit 1 · 2010 · Paper 1Triglycerides are excellent sources of energy for the body because of their I. large size II. ability to insulate III. large number of C-C bonds IV. insolubility in water
  113. Q81 mark · multiple choice· CAPE Biology Unit 1 · 2010 · Paper 1The molecule that is also produced during the formation of a peptide bond is
  114. Q11 mark · multiple choice· CAPE Biology Unit 1 · 2011 · Paper 1Which of the following BEST describes the properties of water? | | Latent Heat of Vaporization | Specific Heat Capacity | Surface Tension | |---|---|---|---| | (A) | Low | Low | High | | (B) | High | High | Low | | (C)…
  115. Q21 mark · multiple choice· CAPE Biology Unit 1 · 2011 · Paper 1Item 2 refers to the diagram below which shows a ring structure of glucose. Which of the following indicates the form of glucose and the molecule in which it is present?
  116. Q31 mark · multiple choice· CAPE Biology Unit 1 · 2011 · Paper 1Triglycerides are excellent sources of energy for the body because of their I. large size II. ability to insulate III. large number of C-C bonds IV. insolubility in water
  117. Q41 mark · multiple choice· CAPE Biology Unit 1 · 2011 · Paper 1Item 4 refers to the following information. Samples of a solution containing carbohydrates are treated as follows: | Sample | Treatment | Result | |---|---|---| | 1. | Benedict's Reagent | No colour change | | 2. |…
  118. Q51 mark · multiple choice· CAPE Biology Unit 1 · 2011 · Paper 1Item 5 refers to the following diagram of a protein structure. During breakdown (hydrolysis) of the protein structure shown above, which of the following types of bonds is broken?
  119. Q61 mark · multiple choice· CAPE Biology Unit 1 · 2011 · Paper 1Item 6 refers to the structures below which show two isomers of glucose. Which of the following statements is NOT true about both isomers?
  120. Q11 mark · multiple choice· CAPE Biology Unit 1 · 2012 · Paper 1Which of the following BEST describes the properties of water?
  121. Q21 mark · multiple choice· CAPE Biology Unit 1 · 2012 · Paper 1Which of the following statements is true about BOTH isomers?
  122. Q31 mark · multiple choice· CAPE Biology Unit 1 · 2012 · Paper 1Phospholipids will affect the function of which of the following cell structures? I. Endoplasmic reticulum II. Centrioles III. Mitochondrion IV. Nucleolus
  123. Q41 mark · multiple choice· CAPE Biology Unit 1 · 2012 · Paper 1Which of the following carbohydrates are MOST likely present in the solution?
  124. Q51 mark · multiple choice· CAPE Biology Unit 1 · 2012 · Paper 1Which of the following is the molecule represented by the structure?
  125. Q61 mark · multiple choice· CAPE Biology Unit 1 · 2012 · Paper 1Which of the following terms BEST describes the structure of collagen?
  126. Q71 mark · multiple choice· CAPE Biology Unit 1 · 2012 · Paper 1Carbohydrates are transported in plants MAINLY in the form of
  127. Q11 mark · multiple choice· CAPE Biology Unit 1 · 2013 · Paper 1Which of the following BEST describes the properties of water? | | Latent Heat of Vaporization | Specific Heat Capacity | Surface Tension | |---|---|---|---| | (A) | Low | Low | High | | (B) | High | High | Low | | (C)…
  128. Q21 mark · multiple choice· CAPE Biology Unit 1 · 2013 · Paper 1Which of the following is NOT a polymer?
  129. Q31 mark · multiple choice· CAPE Biology Unit 1 · 2013 · Paper 1Sucrose is a good transport molecule as seen in phloem tissue because it is a
  130. Q41 mark · multiple choice· CAPE Biology Unit 1 · 2013 · Paper 1A gram of olive oil stores more than twice as much energy as a gram of starch. This is because olive oil
  131. Q51 mark · multiple choice· CAPE Biology Unit 1 · 2013 · Paper 1During hydrolysis of the protein structure shown above, which of the following bonding interactions is broken?
  132. Q61 mark · multiple choice· CAPE Biology Unit 1 · 2013 · Paper 1Which of the following occurs in the tertiary structure but NOT in the primary structure of a protein?
  133. Q71 mark · multiple choice· CAPE Biology Unit 1 · 2013 · Paper 1What is the HIGHEST level of protein structure exhibited by haemoglobin?
  134. Q11 mark · multiple choice· CAPE Biology Unit 1 · 2014 · Paper 1Which three of the following characteristics of water are of biological significance? I. Excellent solvent properties. II. Relatively high heat capacity. III. Lower surface tension than most liquids. IV. Density…
  135. Q21 mark · multiple choice· CAPE Biology Unit 1 · 2014 · Paper 1Which of the following is NOT a polymer?
  136. Q31 mark · multiple choice· CAPE Biology Unit 1 · 2014 · Paper 1Which of the following BEST represents the structure of a triglyceride?
  137. Q41 mark · multiple choice· CAPE Biology Unit 1 · 2014 · Paper 1Item 4 refers to the following molecules. Which of the following bonds is formed between these two molecules during a condensation reaction?
  138. Q51 mark · multiple choice· CAPE Biology Unit 1 · 2014 · Paper 1Item 5 refers to the following information. A student crushes two foods, X and Y, and performs food tests on the extracts. The results are shown in the table below. \begin{tabular}{|l|l|l|} \hline…
  139. Q61 mark · multiple choice· CAPE Biology Unit 1 · 2014 · Paper 1Which of the following occurs in the tertiary structure but NOT in the primary structure of a protein?
  140. Q71 mark · multiple choice· CAPE Biology Unit 1 · 2014 · Paper 1What is the HIGHEST level of protein structure exhibited by haemoglobin?
  141. Q11 mark · multiple choice· CAPE Biology Unit 1 · 2015 · Paper 1Pistia stratiotes (water lettuce) is a rosette-like plant found floating in ponds and natural waterways. Which of the following properties of water assists the plants to float?
  142. Q21 mark · multiple choice· CAPE Biology Unit 1 · 2015 · Paper 1Which of the following combinations correctly describes the structure of molecules I and II?
  143. Q31 mark · multiple choice· CAPE Biology Unit 1 · 2015 · Paper 1Sucrose is a good transport molecule as seen in phloem tissue because sucrose is a
  144. Q41 mark · multiple choice· CAPE Biology Unit 1 · 2015 · Paper 1Which of the biological molecules forms the MAIN component of the cell membrane in animals?
  145. Q51 mark · multiple choice· CAPE Biology Unit 1 · 2015 · Paper 1Which of the following biological molecules has both hydrogen and disulphide bonds?
  146. Q61 mark · multiple choice· CAPE Biology Unit 1 · 2015 · Paper 1Which of the following combinations shows the correct sequence of the solutions, in ascending order, from the LEAST amount of reducing sugar to the MOST?
  147. 1(c)15 marks· CAPE Biology Unit 1 · May/June 2021 · Paper 2Discuss three differences in the structure of starch and cellulose.
  148. 1(a)(i)2 marks· CAPE Biology Unit 1 · May/June 2023 · Paper 2Identify the parts labelled I and II on Amino acid B.
  149. 1(a)(ii)3 marks· CAPE Biology Unit 1 · May/June 2023 · Paper 2Draw a diagram to show how Amino acids A and B form a dipeptide.
  150. 1(b)6 marks· CAPE Biology Unit 1 · May/June 2023 · Paper 2Complete the table by identifying the monomer and the type of linkage for each polymer (cellulose, amylose, glycogen), where row 1 is given as an example.
  151. 1(a)(i)4 marks· CAPE Biology Unit 1 · May/June 2024 · Paper 2List FOUR properties of water which are important to life processes.
  152. 1(a)(ii)4 marks· CAPE Biology Unit 1 · May/June 2024 · Paper 2Describe how TWO properties of water are aided by the hydrogen bonding between water molecules.
  153. 1(a)(ii)4 marks· CAPE Biology Unit 1 · May/June 2025 · Paper 2Outline TWO features of triglycerides that facilitate their ability to release more energy per gram than carbohydrates when catabolized.
  154. 1(a)(i)4 marks· CAPE Biology Unit 1 · May/June 2026 · Paper 2Complete the alpha and beta glucose structures on Figure 1 by correctly adding the missing OH and H groups.
  155. 1(a)(ii)2 marks· CAPE Biology Unit 1 · May/June 2026 · Paper 2On the diagram provided in Figure 2, complete the structure of the other monosaccharide which makes up sucrose.
  156. 1(a)(iii)1 mark· CAPE Biology Unit 1 · May/June 2026 · Paper 2State the name of the monosaccharide which makes up sucrose, other than glucose.
  157. 1(a)(iv)5 marks· CAPE Biology Unit 1 · May/June 2026 · Paper 2Outline a suitable procedure for determining if a new snack in a school cafeteria, made from legume chickpeas, contains starch and proteins, utilizing all of the listed apparatus and material.
  158. 1(a)(v)1 mark· CAPE Biology Unit 1 · May/June 2026 · Paper 2A sample of chickpea snack was mixed with 2 ml absolute ethanol, shaken, allowed to settle, and the ethanol decanted into a tube with 2 ml cold water. The solution remained colourless. State a suitable conclusion based…
  159. 1(c)8 marks· CAPE Biology Unit 1 · May/June 2026 · Paper 2Discuss how the molecular structure of corn starch and the molecular structure of cellulose explain the data shown in Table 1. Present your response in complete paragraphs covering corn starch and cellulose.

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