BY1 January 2009 past paper

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Preview of BY1 January 2009 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
A.M. THURSDAY, 8 January 2009
11/2 hours
For Examiner's use only
Maximum Mark
Question
Mark Awarded
1 6
2 5
3 6
4 9
5 15
6 10
7 9
8 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.
SJJ*(W09-1071-01)

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Examiner
only
1. Below is a list of chemicals which may be found in cells.
A magnesium F calcium
B maltose G phosphate
C amino acid H 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) Found in bones and teeth.…read more

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Examiner
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3. The diagrams show part of a molecule of starch (A) and part of a molecule of cellulose (B). The
hexagonal shapes represent hexose sugars.
A. starch
CH2OH CH2OH CH2OH CH2OH
O O O O
O O O
B. cellulose CH2OH CH2OH
O O
O O
O
O O
CH2OH CH2OH
X
(a) Name monosaccharide X and its form. [1]
.........................................................................................................................................................
(b) Name the bond formed between two hexose sugars. [1]
.........................................................................................................................................................
(c) State two structural differences between starch and cellulose. [2]
....................................................................................................................................................................................................................................…read more

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Examiner
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4. The diagram shows the ultra-structure of a plant cell.
(a) Complete the table by naming and stating the function of each of the organelles labelled
A, B and C. [6]
Organelle Name Function
A
B
C
(b) The structures labelled A are identical. Explain why they differ in appearance in the
diagram. [1]
....................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................
(c) State two ways in which an animal cell would differ from a plant cell. [2]
....................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................…read more

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Examiner
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5. (a) The diagram shows an animal cell.
Ions in
X ...............................................................
Y ...............................................................
Ions out
Z ...............................................................
(i) Sodium ions diffuse into the cell. They then move out of the cell by active transport.
Complete the diagram using the words HIGH or LOW to show the relative
concentration of sodium ions at X, Y and Z. [1]
(ii) Explain how one structural feature of the cell shown helps to ensure a rapid rate of
diffusion. [1]
....................................................................................................................................................................................................................…read more

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(ii) Using the information in the diagram in part (a), explain how active transport of
sodium ions out of the cell helps to ensure a rapid rate of diffusion of sodium ions
into the cell. [1]
....................................................................................................................................................................................................................
....................................................................................................................................................................................................................
(iii) Describe and explain the effect of an increase in temperature on the rate of diffusion.
[2]
....................................................................................................................................................................................................................
....................................................................................................................................................................................................................
(c) The graph shows the relationship between concentration difference across a membrane and
the rate of diffusion, for diffusion and facilitated diffusion.…read more

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(d) Define the term water potential. [1]
....................................................................................................................................................................................................................................
(e) A turgid plant cell was placed in a concentrated solution of sucrose. The diagram shows the
appearance of the cell after one hour.
J ......................................................
S
T
K ......................................................
(i) Label structures J and K on the diagram. [2]
(ii) What evidence on the diagram shows that the water potential of the cell sap must be
higher (less negative) than that of the sucrose solution? [1]
....................................................................................................................................................................................................................…read more

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6. (a) Diagrams A and B represent two different types of enzyme inhibition.
A.
INHIBITOR
ENZYME
B. INHIBITOR
ENZYME
(i) State the type of inhibition shown in A and B. [2]
A ................................................................
B ................................................................
(ii) What type of inhibition, A or B, would be decreased by increasing the concentration
of substrate? [1]
......................................................................................
(1071-01) Turn over.…read more

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(b) Immobilised enzymes are enzyme molecules that are trapped on an inert matrix such as a
gel capsule.
The graph shows the effect of temperature on the maximum rate of reaction of the same
enzyme in its free and in its immobilised state.…read more

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