B2 5.0 / 5 based on 2 ratings ? BiologyHealthy livingGCSEOCR Created by: meganhiggins122Created on: 29-04-15 21:29 What is a pathogen? A disease-causing microorganism. 1 of 21 One of the main problems with viruses is that they: damage the host cell when they reproduce. 2 of 21 What can vaccination involve? injecting an inactive form of the pathogen to stimulate immunity. 3 of 21 What is one way that antibiotics work? They can stop bacteria from reproducing. 4 of 21 What is the main reason why we should be careful not to overuse antibiotics? dangerous strains of resistant bacteria may develop by natural selection 5 of 21 There is no vaccine against the common cold because: the cold virus mutates too quickly for a vaccine to be effective 6 of 21 What are antibiotics? Substances that kill bacteria or prevent their growth. 7 of 21 Antibiotics are effective against: bacteria. 8 of 21 Antibiotic resistance can develop because: mutations in individual bacteria protect them from the antibiotic, allowing them to reproduce 9 of 21 What happens to new medical drugs before they are released? new medical drugs are tested in the laboratory, and then on volunteers. 10 of 21 What are the features of a double-blind trial? neither the researchers nor the volunteers know what the volunteers are receiving. 11 of 21 A placebo is: an inactive substance given in place of a drug 12 of 21 Which blood vessels have the thickest walls? Arteries. 13 of 21 Veins take blood: to the heart and have valves. 14 of 21 In which vessels is blood pressure greatest? arteries. 15 of 21 What do the coronary arteries do? They supply the heart muscle with blood. 16 of 21 A common risk factor for heart disease is: being overweight. 17 of 21 Which of the following is a correlation between a factor and an outcome? people who smoke are more likely to have heart disease 18 of 21 Which of the following factors could increase the risk of heart disease? The number of cigarettes smoked 19 of 21 For a scientist, which of the following is an example of the peer review process? having your work checked by other scientists 20 of 21 Which of the following scientific claims is the most reliable? one that has been checked and repeated by other scientists 21 of 21
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