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centre number and candidate number.
•• Answer all questions.
Answer the questions in the spaces provided
– there may be more space than you need.
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•• The total mark for this paper is 60.
The marks for each question are shown in brackets
– use this as a guide as to how much time to spend on each question.
• structure
In questions marked with an asterisk (*), marks will be awarded for your ability to
your answer logically, showing how points that you make are related or
follow on from each other where appropriate.
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, Answer ALL questions. Write your answers in the spaces provided.
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1 Scientists use microscopes to study cells.
Figure 1 shows a light microscope.
part S
part T
Figure 1
(a) Draw one straight line from each part of the microscope to its function.
(2)
part of microscope function
to stain the cells
part S to focus the image so that it is clear
to magnify the image
part T
to hold the slide in place
to provide light to see the image
2
*P75514A0220*
, (b) Figure 2 shows two photographs of bacteria.
Photograph A was taken through a light microscope.
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Photograph B was taken using an electron microscope.
Photograph A Photograph B
X
Figure 2
(i) Draw, in the box, the bacterial cell labelled X.
Label one part of the bacterial cell on your diagram.
(3)
(ii) State one advantage of using a light microscope and one advantage of using
an electron microscope to study these bacterial cells.
(2)
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