Figure 5 shows a human cheek cell viewed under a light microscope - AQA - GCSE Biology - Question 3 - 2018 - Paper 1
Question 3
Figure 5 shows a human cheek cell viewed under a light microscope.
Label the nucleus and cell membrane on Figure 5.
Cheek cells are a type of body cell.
Body c... show full transcript
Worked Solution & Example Answer:Figure 5 shows a human cheek cell viewed under a light microscope - AQA - GCSE Biology - Question 3 - 2018 - Paper 1
Step 1
Label the nucleus and cell membrane on Figure 5.
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Answer
The nucleus is the dense, spherical structure found within the cell, often located centrally. The cell membrane surrounds the cell and is a thin layer that defines the boundary of the cell.
Step 2
What is the name of this type of cell division?
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Answer
The type of cell division that body cells undergo is called mitosis. This process results in the formation of two daughter cells that are genetically identical to the parent cell.
Step 3
What type of microscope is needed to see ribosomes and mitochondria?
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Answer
An electron microscope is required to see ribosomes and mitochondria, as it provides a higher resolution and magnification than a light microscope.
Step 4
What is the advantage of using the type of microscope you named in part 03.3?
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The main advantage of using an electron microscope is higher magnification, which allows for the visualization of very small structures such as ribosomes and mitochondria.
Step 5
Measure the width of the cell using a ruler
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The width of the cell measured using a ruler is 45 mm.
Step 6
Use the equation to work out the real width of the cell in mm:
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To find the real size of the cell, we can use the equation:
extrealsize=magnificationimage size
Substituting our values:
real size=25045 mm=0.18 mm
Step 7
Convert mm to µm
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To convert mm to micrometres (µm), we use the conversion factor that 1 mm = 1000 µm. Thus:
0.18 mm=0.18×1000=180 µm
Step 8
Calculate the diameter of the bacterial cell.
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Answer
Given that a red blood cell is 8 µm in diameter and a bacterial cell is 40 times smaller, we calculate:
Diameter of bacterial cell=408 µm=0.2 µm
Thus, the diameter of the bacterial cell is 0.2 µm.
