June 2009 Biology past paper

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  • Created on: 30-12-12 13:05
Preview of June 2009 Biology past paper

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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 TO CANDIDATES
Write your name, centre number and candidate number in the spaces at the top of this page.
Answer all questions.
Write your answers in the spaces provided in this booklet.
INFORMATION FOR CANDIDATES
The number of marks is given in brackets at the end of each question or part-question.
You are reminded of the necessity for good English and orderly presentation in your answers.
The quality of written communication will affect the awarding of marks.
CJ*(S09-1071-01)

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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
Mitochondria
Chloroplasts
(b) (i) Draw and label a diagram to show a section through a typical mitochondrion. [3]
(ii) What is the function of mitochondria in cells? [1]
....................................................................................................................................................................................................................…read more

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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 metaphase and anaphase to show how the
chromosomes are arranged. [2]
(c) Describe two processes that take place during stage A. [2]
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(Total 7 marks)
(1071-01) Turn over.…read more

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Examiner
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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 as a coiled ladder.
A
B
(i) What are the `uprights' of the ladder, labelled A, made of? [1]
....................................................................................................................................................................................................................
(ii) The `rungs' are made by the pairing of components labelled B.…read more

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Examiner
only
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) Select a single phospholipid molecule in the diagram and label the part which is
hydrophilic and the part which is hydrophobic. [1]
(b) The proteins are drawn to give some indication of their tertiary structure.…read more

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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 this protein would position itself in the membrane. [1]
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(Total 9 marks)
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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 two ways by which materials move between cell X and cell Y. [2]
....................................................................................................................................................................................................................................
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(c) Cells X and Y are at incipient plasmolysis, in a 0.6 molar glucose solution.…read more

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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]
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(iii) Two different cells P and Q are adjacent to one another in a plant. Calculate the
missing values for each cell and complete the following table. [2]
cell s p
Cell
kPa kPa kPa
P .................................
­1200 +500
Q ­300 .................................…read more

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