Science 30 January 1999 Grade 12 Diploma Examination
Science 30 January 1999 Grade 12 Diploma Examination Science 30 January 1999 Grade 12 Diploma Examination
4. Some forms of cancer can be treated by exposure of the affected tissues tocobalt-60, a radioactive isotope. In the equation for the production of this isotope,x represents59 60Co + x Co2727A. a protonB. a neutronC. an electronD. an alpha particleUse the following information to answer the next question.Measuring Blood PressureRubber cuff inflated with airVessel X5. The vessel labelled X, which is compressed by the cuff, carries blood away fromthe heart. The vessel isA. an artery carrying oxygenated bloodB. an artery carrying deoxygenated bloodC. a vein carrying oxygenated bloodD. a vein carrying deoxygenated blood2
6. The blood in the veins of the leg can flow against the force of gravity becauseA. veins have one-way valves that help return blood to the heartB. the blood in the veins is pulled by a vacuumC. veins carry deoxygenated bloodD. veins have thin walls7. Antibodies are important in the defence of the body. TheyA. are produced by antigens present in the bloodB. are produced in response to bacteria and viruses in the blood or tissuesC. combine with phagocytes to form cells that are resistant to invading particlesD. combine with antigens to form chemical compounds that protect the bodyagainst bacteria or viruses8. The sympathetic nervous system is likely most active when a person isA. running a raceB. digesting a large mealC. sleeping in the afternoonD. recovering from an illness3
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4. Some forms of cancer can be treated by exposure of the affected tissues tocobalt-60, a radioactive isotope. In the equation for the production of this isotope,x represents59 60Co + x Co2727A. a protonB. a neutronC. an electronD. an alpha particleUse the following information to answer the next question.Measuring Blood PressureRubber cuff inflated with airVessel X5. The vessel labelled X, which is compressed by the cuff, carries blood away fromthe heart. The vessel isA. an artery carrying oxygenated bloodB. an artery carrying deoxygenated bloodC. a vein carrying oxygenated bloodD. a vein carrying deoxygenated blood2
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