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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…

Page 2

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2 Examiner
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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…

Page 3

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3 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…

Page 4

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4 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…

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5




BLANK PAGE




Turn over.

Page 6

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6 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…

Page 7

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7 Examiner
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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…

Page 8

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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.…

Page 9

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9 Examiner
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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…

Page 10

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10 Examiner
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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.



25



20
yme
enz…

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