6 a Explain how a population of antibiotic resistant bacteria might develop

6 a explain how a population of antibiotic resistant

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6 (a) Explain how a population of antibiotic-resistant bacteria might develop from non-resistant bacteria. ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... ......................................................................................................................................... (3 marks) 6 (b)Suggest tworeasons why it is an advantage to keep farm animals disease free. (2 marks) People do not always agree about the use of antibiotics in food production. Some farmers put low doses of antibiotics in feed for animals such as cattle and sheep. Antibiotics help to keep animals disease-free. Antibiotics also help animals to grow. The use of antibiotics in livestock feed means that there is a higher risk of antibiotic-resistant bacteria developing. These could be dangerous to human health. 5
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10 Do not write outside the box 7 Some athletes use drugs containing the steroid testosterone to improve their performance. In an investigation: scientists monitored the performance of 18 male athletes over a 6 week training programme 9 athletes were given weekly injections of testosterone with the dose of 3.5 milligrams per kilogram of body mass, for 6 weeks the other 9 athletes were given a placebo the athletes’ performance on a bench press exercise was measured at 3 weeks and 6 weeks. The graph shows the results of the investigation. 7 (a) The data would have been better presented as a bar chart. Give a reason why. GCSE Science A Biology Unit 1 Specimen Paper Higher Tier V1.1 ......................................................................................................................................... ......................................................................................................................................... (1 mark) 7 (b) Suggest what was given as a placebo in this investigation. ......................................................................................................................................... ......................................................................................................................................... (1 mark)
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11 GCSE Science A Biology Unit 1 Specimen Paper Higher Tier V1.1 Turn over Do not write outside the box 7 (c) Describe the results of the investigation. .............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................(2 marks) 7 (d) Most internet advertisements for testosterone state that athletes need to use testosterone for at least 10 weeks to significantly improve performance. Do the results of this investigation support the statement in the advertisements? Give onereason for your answer. ......................................................................................................................................... ......................................................................................................................................... (1 mark) Turn over for the next question 5
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12 GCSE Science A Biology Unit 1 Specimen Paper Higher Tier V1.1 Do not write outside the box 8 A person accidentally touches a hot pan. Her hand automatically moves away from the pan. The diagram shows the structures involved in this action.
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