Exam code: 4XSD1
The diagram below shows an image of a plant cell.
Name structures P, Q and R.
(i) Name one structure that is visible in the diagram that you did not identify in your answer to part (a).
[1]
(ii) State the function of the structure named in part (i)
[1]
Which of the following structures is not found in a prokaryotic cell?
A cell membrane
Chloroplasts
Plasmids
Circular DNA
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A student uses a light microscope to look at a human cheek cell.
The student makes this drawing of the cell.
Name the organelle shown in the drawing.
Mitochondria are organelles that are too small to be seen using a light microscope.
The drawing shows a mitochondrion that has been magnified.
The actual length of this mitochondrion is 6 μm.
[1 μm = 0.001 mm]
Calculate the magnification of this drawing.
The table gives information about mitochondria in different human cells.
Cell | Mean number of mitochondria per cell | Mean volume of cell in µm3 | Mean number of mitochondria per µm3 |
|---|---|---|---|
Heart muscle | 5 000 | 15 000 |
|
Sperm | 75 | 30 | 2.50 |
Egg | 600 000 | 4 000 000 | 0.15 |
(i) What is the mean number of mitochondria per μm3 in a heart muscle cell?
[1]
(ii) Comment on the differences in the data for the sperm and for the egg.
[3]
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The image below is an electron microscope photograph of a cell.
(i) Name the group of organisms from which the cell shown in the image has been taken.
[1]
(ii) Explain how you identified the group of organisms in part (i).
[1]
Structure Y in part (a) is a starch granule.
Explain why structure Y is present inside structure X in the image in part (a).
Name three structures that are not clearly identifiable in the image in part (a) that you would expect to find inside cells from this group of organisms.
The cell in part (a) has been magnified 7.5 x 103 times, and the image of the nucleus has a diameter of 6.5 cm.
Use the formula below to calculate the actual diameter of the nucleus. Give your answer in μm.
Note that 1 μm = 0.001 mm
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