Cells AQA AS Biology EXAM QUESTIONS

Questions on cells followed by mark schemes

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Q1.Essay
You should write your essay in continuous prose.
Your essay will be marked for its scientific accuracy.
It will also be marked for your selection of relevant material from different parts of the
specification and for the quality of your written communication.
The maximum number of marks that can be awarded is
Scientific 16
Breadth of knowledge 3
Relevance 3
Quality of written communication 3
Write an essay on the following topic:
How microscopes have contributed to our understanding of living organisms.
(Total 25 marks)
Q2. The diagram shows a cell from a potato.
(a) Give two features which may be found in a prokaryotic cell which would not be
found in this cell.
1 ...................................................................................................................
2 ...................................................................................................................
(2)
(b) (i) Describe how you could confirm that the granules contained starch.
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Name one polysaccharide other than starch that would be found in this cell.
.............................................................................................................
(1)
(c) Explain one advantage of storing starch rather than glucose in potato cells.
......................................................................................................................
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(2)
(Total 6 marks)
Q3. The diagram shows how some organelles may be distinguished from each other.
Organelle found in prokaryotic Organelle found only in
and eukaryotic cells eukaryotic cells
Organelle A
Organelle found in Organelle found in
animal cells and in plant cells. Contains
plant cells.…read more

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Larger organelle surrounded Smaller organelle surrounded
by an envelope through which by an outer membrane. Has an inner
there are pores. usually one membrane, folded to form cristae.
per cell. Many in the cell.
Organelle C Organelle D
(a) (i) .
Name organelle B
.............................................................................................................
(1)
(ii) .
Describe the function of organelle B
.............................................................................................................
.............................................................................................................
.............................................................................................................
.............................................................................................................
(2)
(b) ,
Which of organelles A B, C or D
(i) is a ribosome;
.............................................................................................................…read more

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The ground liver was centrifuged at low speed. The pellet that formed at the
bottom of the centrifuge tube was thrown away and the supernatant
centrifuged again at higher speed. Explain why it was necessary to first
centrifuge the ground liver at low speed in order to obtain a suspension of
organelle D.
.............................................................................................................
.............................................................................................................
.............................................................................................................
.............................................................................................................
(2)
(Total 8 marks)
Q4. , B and C
The diagram shows the outer layers of three different cells, A .…read more

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C is a prokaryotic cell?
.............................................................................................................
.............................................................................................................
(1)
(b) .
Explain how you would calculate the magnification of cell C
......................................................................................................................
......................................................................................................................
(1)
(c) Cell A is a plant cell. Name a polysaccharide which may be found in cell A
but would
not be found in the animal cell.
......................................................................................................................
(1)
(d) Penicillin is an antibiotic. It prevents the formation of bacterial cell walls. As a result,
bacterial cells that have been treated with penicillin swell and burst as water enters.…read more

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Total 7 marks)
Q5. (a) Name the process in which cells become adapted for different functions.
......................................................................................................................
(1)
(b) Palisade cells are found in leaves. The diagram shows a palisade cell.
(i) Name structure A.
.............................................................................................................
(1)
(ii) and Y
The real length of this cell between X is 20 micrometres (µm). By how
many times has it been magnified? Show your working.…read more

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Answer ............................................
(2)
(iii) Explain one w
ay in which this cell is adapted for photosynthesis.
.............................................................................................................
.............................................................................................................
(1)
(Total 5 marks)
Q6. (a) Give one feature of starch and explain how this feature enables it to act as a
storage substance.
Feature ........................................................................................................
Explanation ..................................................................................................
......................................................................................................................
......................................................................................................................
(2)
(b) The diagram shows part of a cellulose molecule.
(i) Name part A.
.............................................................................................................
(1)
(ii) Name bond B.
.............................................................................................................…read more

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The structure of cellulose is related to its role in plant cell walls. Explain how.
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(3)
(Total 7 marks)
Q7. The diagram shows a chloroplast as seen with an electron microscope.
(a) Name X and Y.
X ....................................................................................................................
Y ....................................................................................................................
(2)
(b) Describe the function of a chloroplast.
........................................................................................................................…read more

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Calculate the maximum length of this chloroplast in micrometres (m). Show
your working.
Answer ...............................................…read more

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M1. General Principles for marking the Essay:
Four skill areas will be marked: scientific content, breadth of knowledge, relevance and
quality of language. The following descriptors will form a basis for marking.
Scientific Content (maximum 16 marks)
Category Mark Descriptor
16
Most of the material reflects a comprehensive
Good 14 understanding of the principles involved and a
knowledge of factual detail fully in keeping with a
programme of A-level study. Some material,
however, may be a little superficial.…read more

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