1. Chapter 4: Chemical Composition of Cell
Section A
1. Diagram shows the results of an experiment in which three similar shirts P, Q and R with
identical fat stains were washed in an enzyme-containing washing powder at three
different temperature 150C, 350C and 650C.
a) (i) State the temperature at which each shirt P, Q and R was washed. [1m]
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(ii) Explain your answer for each shirt. [3m]
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b) Suggest two changes to the procedure which might have resulted in the complete
removal of the stain from shirt R. [2m]
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c) (i) Name the enzyme likely used in the powder. [1m]
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(ii) Suggest the type of enzyme that should be present in a washing powder designed to
remove blood stains. [2m]
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d) How does enzyme in the washing powder remove food stains on the clothes? [1m]
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2. 2. Diagram shows the structures of four organic compounds which are found in living cells.
a) (i) Name the structure of compounds X and Z. [2m]
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(ii) State the monomer of X and Y. [2m]
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b) What if pancreatic cells are unable to synthesis compound X? [1m]
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c) (i) In the space below, draw and label the structure of the basic unit of organic
compound W. [2m]
(ii) Name two types of organic compound W. [2m]
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(iii) State two structural differences between the organic compounds you named in c(ii)
[2m]
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