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Circulatory & Respiratory System › ViewHelp fight infections from bacteria, viruses and other invading substances. These are bigger and fewer cells, but increase in number when you are sick.
A. plasma
B. red blood cells
C. white blood cells
D. platelets
Enzymes & Metabolism HL › View
How can enzyme activity be measured in an experiment?
A. By measuring the rate of substrate disappearance
B. By counting the number of enzyme molecules
C. By observing the color change of the enzyme
D. By measuring the enzyme’s weight