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Scientists investigated the effect of a drug called a proton pump inhibitor. The drug is given as atablet to people who produce too much acid in their stomach. It binds to a carrier protein in thesurface membrane of cells lining the stomach. This carrier protein usually moves hydrogen ionsinto the stomach by active transport.The scientists used two groups of people in their investigation. All the people produced too muchacid in their stomach. People in group P were given the drug. Group Q was the control group.The scientists used a control group in this trial. Explain why [1 mark]
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