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1.1 Cell structures

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Question 17
F

A student uses a light microscope to look at a slide of cheek cells.

The steps are shown below, but they are not in the correct order.

P Turn the coarse focusing knob until the cells are in focus. Q Place the slide on the stage and secure it with the clips. R Change to a higher power objective lens and use the fine focusing knob. S Select the lowest power objective lens.

Which is the correct order of the steps?

[1]
A

S, Q, R, P

B

Q, S, P, R

C

Q, R, P, S

D

S, P, Q, R

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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