Daily Practice · GCSE Science

Daily Practice - GCSE Science

30th September 1996

5 questions · GCSE · 584 questions in this band

1
Cell Biology
A student views a red blood cell at a magnification of x2000. The image of the cell measures 20 mm across. Calculate the real width of the cell, giving your answer in micrometres (um).
2
Cell Structure and Microscopy
Why is a stain such as iodine used when preparing a slide?
3
Cell Division and Stem Cells
What happens to the DNA before mitosis begins?
4
Transport in and out of Cells
Define osmosis.
5
Organisation
Explain why the rate of an enzyme-controlled reaction decreases sharply above the enzyme's optimum temperature.

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