Download AQA B2 ESQ - Cell Structure and Specialisation ANS

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Cells and Cell Structure
1
The diagram below shows a human sperm. The sperm cell can swim by moving the
tail in a side to side motion.
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Mid-piece
Head
Tail
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1 (a) (i) The mid-piece shown in the diagram contains many mitochondria. Suggest a reason
why there are many mitochondria in the mid-piece of the sperm cell.
Provide/release energy [1 mark]
Through respiration or aerobic respiration [1 mark]
(2 marks)
not to say ‘produce energy or ‘create energy’, as these terms are
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technically incorrect. The science specs are very fussy about that.
!1 (b) A sperm cell is compared to a cell that comes from a plant called a leaf mesophyll cell.
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1 (b) (i)! Name part A that both cells have in common.
Nucleus [1 mark]
(1 mark)
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1 (b) (ii) Name one part shown in the diagram that is present in the leaf cell only.
Cell wall/vacuole [1 mark]
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You might get a mark for saying chloroplast, as it is not
totally clear that the structure other than the nucleus is a
vacuole.
(1 mark)
Total 4 marks
Turn over for the next question
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Cells and Cell Structure
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!2 (a)
Diagrams X, Y and Z show some cells. They are not all drawn to the same scale.
X
Y
Z
DNA
Mitochondria
Which cell, X, Y or Z, has adaptations to increase diffusion?
Cell Y [1 mark]
Give one reason for your choice.
(Because) the membrane is folded or it has folds in the membrane [1 mark]
You are allowed, ‘has high or large surface area’
2 (b)
Cell X is found in muscle tissue. What is a tissue?
(2 marks)
A group of cells [1 mark]
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Which have a similar structure [1 mark]
And have a similar function [1 mark]
(2 mark)
2 (b) (i) Cell X has the function of contracting to allow movement of muscles. Use the diagram to
explain one adaptation of this cell which helps contraction for movement.
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2 (c)
It has lots of mitochondria [1 mark]
Which release energy [1 mark]
See the note above about
the terminology here.
Through (aerobic) respiration [1 mark]
(2 marks)
Cell Z is a bacterial cell. Give one piece of evidence from the diagram that shows
that cell Z is a bacterial cell.
(It) has no nucleus or the DNA is not in a nucleus [1 mark]
or it has a tail / flagellum
The cell wall is not allowed for this mark,
because plant cells also have cell walls.
(1 mark)
(Total 7 marks)
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