Daily Practice

GCSE Science

23rd August 1990

5 questions · GCSE · 584 questions in this band

1
Cell Division and Stem Cells
How many pairs of chromosomes are there in a human body cell?
2
Transport in and out of Cells
State three factors that increase the rate of diffusion.
3
Organisation
An amylase reaction is complete after 200 seconds. Calculate the rate of reaction using rate = 1000 / time.
4
The Digestive System and Enzymes
What is an enzyme?
5
The Circulatory System and Heart
State the function of the valves in the heart and in veins.

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