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7/23/2019 Section 4 – Cell Membrane Structure – Set 6
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Section 4 – Cell Membrane structure – set 6
13. The diagram below shows the structure of the cell surface membrane.
C a r b o h y d r a t e P r o t e i n s
G l y c o p r o t e i n
(a) The cell surface membrane is composed of a phospholipid bilayer. Explain why tile
phospholipids in the bilayer are arranged with the fatty acid tails pointing inwards and the phosphate heads outwards.
……………………………………………….………………………………………
……………………………………………….………………………………………
……………………………………………….………………………………………
……………………………………………….………………………………………
……………………………………………….………………………………………
……………………………………………….………………………………………(3)
(b) The diagram has been magnified three million ( ! "#$) times. Calculate the width ofthe cell surface membrane in tin (micrometres). %how your wor&ing.
'nswer ………………………… µm(3)
(c) %tate onefunction of each of the following components of the cell surface membrane.
Carbohydrate ………………………………………………………………………..
Protein ………………………………………………………………………………(2)
(Total 8 marks)
1
7/23/2019 Section 4 – Cell Membrane Structure – Set 6
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15. The diagram below shows the structure of two fatty acids.
'
(
)
C
*)
C
)
)
C
)
)
C
)
)
C
)
)
C
)
)
C
)
)
C
)
)
C
)
)
C )
)
)
C
)
)
C
)
)
C
)
)
C
)
)
C
)
CC
*
*
*
)
)
(a) Gi+e the name of the molecule to which three fatty acids are bonded to form a
triglyceride lipid.
.....................................................................................................................................(1)
(b) (i) ,ame the type of fatty acid labelled .
...........................................................................................................................(1)
(ii) -escribe oneway in which the physical properties of a triglyceride composed of
fatty acids of type will differ from a triglyceride of similar molecular sie
composed of fatty acids of type '.
...........................................................................................................................
...........................................................................................................................(1)
(c) -raw a diagram to show the arrangement of phospholipid molecules in a unit (cell)
membrane.
(2)
(Total 5 marks)
2
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47. (a) The diagram below shows the structure of a triglyceride.
C h / * C
*
C ) * C
*
C ) / * C
*
t r i g l y c e r i d e
( o n d '
(i) ,ame ond ' on the diagram.
...........................................................................................................................(1)
(ii) ,ame the type of reaction that will brea& down the triglyceride into its constituent
parts during digestion by lipase enymes.
........................................................................................................................... (1)
(iii) ,ame two products formed when triglycerides are completely digested.
" ........................................................................................................................
/ ........................................................................................................................(2)
(i+) %ome triglycerides ha+e se+eral double bonds (C C)0 others ha+e none.-escribe one way in which the physical property of triglycerides which includese+eral double bonds will differ from triglycerides which ha+e no double bonds.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................(1)
3
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(b) 1ipids in membranes ha+e an additional chemical group attached.
(i) ,ame the chemical group which is added to the lipids in membranes.
...........................................................................................................................(1)
(ii) Explain how adding this extra chemical group allows the formation of a cell
membrane.
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................
...........................................................................................................................(2)
(Total 8 marks)
4
