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1.1 Cell structures

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Question 4
F

A student looks at human cheek cells stained with methylene blue.

The Figure shows the student's drawing of the cells.

Figure

image

a.

Give three ways the student could improve the drawing.

[3]
b.

Explain why the student first looks at the slide using the lowest power objective lens.

[2]
c.

The width of one cell in the drawing is 45 mm. The real width of the cell is 60 μm60\ \mu\text{m}60 μm.

The student writes:

magnification =45÷60=×0.75= 45 \div 60 = \times 0.75=45÷60=×0.75

Explain the mistake the student has made and calculate the correct magnification.

[3]
Markscheme

1.1 Cell structures Questions

  1. GCSE
  2. /Biology
  3. /1.1 Cell structures

130 exam-style questions on OCR GCSE Biology 1.1 Cell structures, covering 1.1.1 Viewing cells with light microscopes, 1.1.2 Sub-cellular structures and functions, and 1.1.3 Electron microscopy and resolution. Each one has a worked solution and a mark scheme showing where the marks go.

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