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Candidate Centre Candidate
Name Number Number
2




GCE AS/A level
1071/01 New AS
BIOLOGY/HUMAN BIOLOGY ­ BY1
P.M. MONDAY, 1 June 2009
11/2 hours




For Examiner's use only

Maximum Mark
Question
Mark Awarded
1 8
2 7
3 9
4 9
5 10
6 17
7 10
Total 70



INSTRUCTIONS…

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2 Examiner
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1. (a) The following table compares plant and animal cells. Complete the table by placing a
tick () in the appropriate box if the structure is present. Place a cross (×) in the box if the
structure is not present. [2]


Structure Plant Cell Animal Cell
Centrioles…

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3 Examiner
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2. The diagram shows the regular pattern of events that occur in dividing cells.




C


metaphase




anaphase



B
telophase

A




(a) Name the stages in the cycle labelled A, B and C. [3]

A ..................................................................................................




B ..................................................................................................




C ..................................................................................................




(b) Complete the drawings of the cells in…

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3. (a) (i) Draw a simple labelled diagram to show how the three parts of a nucleotide are
arranged. [3]




(ii) How do nucleotides of RNA differ from nucleotides of DNA? [2]

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(b) The DNA molecule is a double helix. It may be described…

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5




BLANK PAGE




(1071-01) Turn over.

Page 6

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6 Examiner
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4. The diagram represents a model of a biological membrane. This model has been described as
`a phospholipid sea with protein icebergs'.

Charged part of
protein molecule

Uncharged part of
protein molecule




(a) (i) Name the model, proposed by Singer and Nicholson in 1972. [1]

....................................................................................................................................................................................................................




(ii)…

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(c) (i) With reference to the diagram and your answer to part (a) (ii), explain how the
distribution of charged and uncharged parts determine the position a protein will take
up in a membrane. [2]

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....................................................................................................................................................................................................................




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(ii) The diagram below shows another protein.




Suggest how…

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8 Examiner
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5. The drawings below show two adjacent plant cells, placed in a 0.6 Molar glucose solution.




A
B
C

D
E
F




Cell X Cell Y



(a) Name the parts labelled A-F. [2]

A ......................................................................




B ......................................................................




C ......................................................................




D ......................................................................




E ......................................................................




F ......................................................................




(b) Name…

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9 Examiner
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(d) The water potential of vacuolated cells is represented by the equation:

cell = s + p

(i) Define the term water potential. [1]

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(ii) Give the value of p in cells at incipient plasmolysis. [1]

....................................................................................................................................................................................................................




(iii) Two different cells P and Q…

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(1071-01)

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