WJEC. Unit 1 Protein Questions

Transcription

1 NAME: PTIN GRUP WJE Unit 1 Protein Questions Question Book 1 (legacy Qs from Jan 2000 to Jan 2009 and Jan 2009 to June 2015) Question Number(s) Due Date & Pass Mark omework Mark Resist Question number(s) Resist Due Date & Pass Mark Mark Resit 1

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10 12 Examiner Arholwr yn unig 7. Answer one of the following questions. Any diagrams included in your answer must be fully annotated. Either, (a) Describe the four levels of protein structure. [10] r (b) Describe the methods of transportation across a cell membrane. [10] (311-01) 10

11 13 Examiner Arholwr yn unig (311-01) Turn over. 11

12 2 Examiner 1. Below is a list of chemicals which may be found in cells. A magnesium F calcium B maltose G phosphate amino acid water D cellulose I sucrose E iron Each of the following statements applies to one or more of these chemicals. After each statement, write in the box the letter or letters which correspond(s) to the chemical(s) being described. Each letter may be used once, more than once, or not at all. (a) (b) (c) (d) Found in bones and teeth. A non-reducing sugar Found in chlorophyll in leaves. A polysaccharide found in plant cell w und attached to lipids in the plasma membrane. (f) A large quantity of energy is needed to raise its temperature. (Total 6 marks) 2. (a) The level of protein structure is decided by the folding of the molecule and the types of bonds present. Tick ( ) the boxes in the table to show all the bonds present at each level of protein structure. [3] Level of protein structure Types of bonds peptide hydrogen disulphide ionic Primary Secondary Tertiary (b) (i) ow does the quaternary structure of a protein differ from the tertiary structure? [1]... (ii) Give an example of a quaternary protein. [1]... (Total 5 marks) ( ) 12

13 2 Examiner 1. Below is a list of chemicals which may be found in cells. A magnesium F calcium B maltose G phosphate amino acid water D cellulose I sucrose E iron Each of the following statements applies to one or more of these chemicals. After each statement, write in the box the letter or letters which correspond(s) to the chemical(s) being described. Each letter may be used once, more than once, or not at all. (a) (b) (c) (d) (e) (f) Found in bones and teeth. A non-reducing sugar Found in chlorophyll in leaves. A polysaccharide found in plant cell walls. Found attached to lipids in the plasma membrane. A large quantity of energy is needed to raise its temperature. (Total 6 marks) 2. (a) The level of protein structure is decided by the folding of the molecule and the types of bonds present. Tick ( ) the boxes in the table to show all the bonds present at each level of protein structure. [3] Level of protein structure Types of bonds peptide hydrogen disulphide ionic Primary Secondary Tertiary (b) (i) ow does the quaternary structure of a protein differ from the tertiary structure? [1]... (ii) Give an example of a quaternary protein. [1]... (Total 5 marks) ( ) BY1 1/09 13

14 2 Examiner 1. The table shows three features that may be found in bacteria and viruses. If the feature is present put a tick ( ) in the box, if it is not present put a cross ( ) in the box. [3] Feature Bacterium Virus Possess nucleic acid Surrounded by a protein coat Ribosomes in cytoplasm (Total 3 marks) 2. (a) The diagram represents a section of a collagen molecule. (i) Name the group of proteins to which collagen belongs. [1]... (ii) Describe the structure of a collagen molecule. [3] (iii) State one function of collagen. [1]... ( ) BY1 2/10 14

15 3 Examiner (b) aemoglobin belongs to another group of proteins called globular proteins. The diagram shows a molecule of haemoglobin. β 2 β 1 α 2 α 1 Structure of haemoglobin (i) Describe three differences between collagen and haemoglobin that you can see in the diagrams. [3] (ii) Name one other type of globular protein. [1]... (Total 9 marks) ( ) Turn over. BY1 2/10 15

16 8 Examiner 5. The diagrams below show two molecules, A and B, which are found in living organisms. N R 2 2 glycerol molecule A fatty acid chains molecule B (a) (i) Name molecules A and B. [2] A... B... (ii) Name an element found in molecule A that is not found in molecule B. [1]... (b) Many molecules of A can join together to form a long chain. Name the process that joins the molecules together and the bond formed when they join. [2] (c) (i) Describe a suitable test that could be performed to show that a solution contained polymers of molecule A. [2] (ii) Suggest a problem that could arise in using this test if very low concentrations of the polymer are present in the solution. [1]... ( )... (Total 8 Marks) BY1 2/11 16

17 14 Examiner 8. Answer one of the following questions. Either, (a) Describe the biological principles involved in the use of immobilised enzymes [10] r (b) [10] BY1 1/12 ( ) 17

18 15 Examiner BY1 1/12 ( ) Turn over. 18

19 2 1. (a) The diagram below shows the structure of an amino acid. Examiner A R B 2 N (i) Name the two shaded groups A and B shown on the diagram above. [2] A... B... (ii) What is represented by letter R in the diagram above? [1] (b) The diagram below shows two amino acids joined together. R 1 N N R 2 Using the diagram shown above: (i) Name the type of molecule shown. [1] (ii) Name the bond highlighted in diagram (b) above. [1] WJE BA Ltd. BY1 2/13 ( ) 19

20 ( ) Turn over Examiner (c) The diagram below shows part of a protein molecule. (i) Name bond X shown on the diagram above. [1] (ii) What name is given to the shape of this molecule? [1] (iii) What level of protein structure does the diagram above show? [1] (Total 8 marks) WJE BA Ltd. N N X N N N N N N N N N BY1 2/13 20

21 subunit 1 subunit 2 subunit 1 subunit (a) (b) BY1 2/14 21

22 9 (c) (d) BY1 2/14 Turn over. 22

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