1 mark 4 c ii Explain how a vaccination prevents infection 3 marks 4 d i

1 mark 4 c ii explain how a vaccination prevents

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[1 mark] ............................................................................................................................................ ............................................................................................................................................ 4 (c) (ii) Explain how a vaccination prevents infection. [3 marks] ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ 4 (d) (i)Antibiotics can only be used to treat some infections.Explain why antibiotics cannot be used to treat measles.
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(10) 5 Figure 3 shows how a nerve impulse passing along a relay neurone causes an impulse to be sent along another type of neurone, neurone X . Figure 3 Impulse Impulse Relay neurone Chemical Synapse Neurone X 5 (a) What type of neurone is neurone X ? [1 mark] ............................................................................................................................................ 5 (b) Describe how information passes from the relay neurone to neurone X . Use Figure 3 to help you. [3 marks] ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................
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11 Do not write outside the box G/Jun14/BL1HP Turn over (11) 5 (c) Scientists investigated the effect of two toxins on the way in which information passes across synapses. Table 2 shows the results. Table 2 Toxin Effect at the synapse Curare Decreases the effect of the chemical on neurone X Strychnine Increases the amount of the chemical made in the relay neurone Describe the effect of each of the toxins on the response by muscles. [2 marks] Curare ................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ Strychnine .......................................................................................................................... ............................................................................................................................................ ............................................................................................................................................ ____ 6 Turn over for the next question
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12 Do not write outside the box G/Jun14/BL1HP (12) 6 Drugs may harm the human body. 6 (a) The drug thalidomide was originally developed in the 1950s. 6 (a) (i) What was the drug thalidomide originally developed to treat? What happens in the body to make someone dependent on a drug?
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(13) 6 (b) (ii) Doctors rated different recreational drugs according to how dependent users had become on them. Figure 4 shows the results. Figure 4 Drug Heroin Class A Key 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Cocaine LSD Ecstasy Barbiturate Amphetamine Cannabis GHB Anabolic steroids Nicotine Alcohol Khat Class B Class C Unclassified Increasing dependence It is illegal (against the law) to take Class A, B or C drugs. Unclassified drugs are legal. Some people think that some legal drugs should be made illegal.
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  • Spring '16
  • nour
  • Biology, RNA, Pastpaperquestions AQA Science, ........., MMR vaccine, MMR vaccine controversy

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