AQA GCSE BIOLOGY Higher Tier Paper 1H 2018.

Please write clearly in block capitals. Centre number Surname Forename(s) Candidate signature Candidate number GCSE BIOLOGY Higher Tier Paper 1H H Tuesday 15 May 2018 Afternoon Time allowed: 1 hour 45 minutes Materials For this paper you must have: • a ruler • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions in the spaces provided. • Do all rough work in this book. Cross through any work you do not want to be marked. • In all calculations, show clearly how you work out your answer. Information • There are 100 marks available on this paper. • The marks for questions are shown in brackets. • You are expected to use a calculator where appropriate. • You are reminded of the need for good English and clear presentation in your answers. For Examiner’s Use Question Mark 1 2 3 4 5 6 7 TOTAL *JUNH01* IB/M/Jun18/E8 8461/1H 2 There are no questions printed on this page DO NOT WRITE ON THIS PAGE ANSWER IN THE SPACES PROVIDED Do not write outside the box *02* IB/M/Jun18/8461/1H 3 0 1 Eating food containing Salmonella bacteria can cause illness. 0 1 . 1 Two symptoms of infection by Salmonella are vomiting and diarrhoea. What causes these symptoms? [1 mark] 0 1 . 2 Give two ways a person with a mild infection of Salmonella can help prevent the spread of the bacteria to other people. [2 marks] 1 2 0 1 . 3 In very serious infections of Salmonella, a doctor can prescribe drugs to kill the bacteria. What type of drug can the doctor prescribe to kill the bacteria? [1 mark] 0 1 . 4 A person with AIDS may take longer than a healthy person to recover from a Salmonella infection. Explain why. [2 marks] Turn over ► *03* IB/M/Jun18/8461/1H Do not write outside the box 4 0 1 . 5 Salmonella bacteria can be transmitted from chickens to humans. Chickens can be vaccinated to prevent the transmission of Salmonella bacteria to humans. Suggest one other way farmers could prevent the transmission of Salmonella from chickens to humans. [1 mark] A restaurant owner employed a scientist to test the effectiveness of two kitchen cleaning liquids. The scientist took samples from two work surfaces: • before the surfaces had been cleaned with the cleaning liquids • after the surfaces had been cleaned with the cleaning liquids. The samples were then analysed for the number of bacteria they contained. The results are shown in Figure 1. Figure 1 Do not write outside the box *04* IB/M/Jun18/8461/1H