2017 hkdse integrated science€¦ · paper 1 q. 2, 3, 9,10 paper 2 q. 2 10 november 2017 . paper...
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2017 HKDSE Integrated Science Paper 1 Q. 2, 3, 9,10 Paper 2 Q. 2 10 November 2017
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Paper 2B
Paper 1
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Paper 1
Q. 2, 3, 9,10
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2
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- Poor performance - overlooked the information of the question: BTX inhibits the release of neurotransmitters from the neurones
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− Some candidates overlooked the requirement of the question: different variations in blood glucose level
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9
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b
c
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- Poor performance - Failed to point out the importance of creating the same sticky ends to join the plasmid and the viral gene segment by complementary base pairing
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- Unsatisfactory performance - Recombinant DNA technology involves ligation as well as gene isolation
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- Unsatisfactory performance - misunderstood the question: to explain why instead of how the foreign viral gene can be expressed in the new host
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- Unsatisfactory performance - Confused vaccine with antibiotics - vague answers such as disrupting the food chain
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- Fair performance - focusing only on producers or decomposers in the flow of energy and cycling of materials OR discussing the role of consumers instead of decomposers - not realizing that energy flow is one-way and eventually lost to the surroundings - discussing only on the nitrogen cycle, but not the carbon, oxygen cycle and the water cycle
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Paper 2
Q. 2
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a
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- Fair performance - Failed to realize how a heart attack is related to the blockage of the coronary arteries
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- Good performance - Some wrongly proposed using ‘common chopsticks’ instead of ‘serving chopsticks’
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- Poor performance - overlooked the information of the question: the women who gave birth were screened to identify the HBV carriers, but not the babies born
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- Fair performance - Failed to point out that it is the net loss of bone upon aging that causes the decline in bone minerals
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- Fair performance - Did not mention that calcium is the mineral that gives strength to bones and that the calcium absorption is assisted by vitamin D. - misconception that little outdoor exercise would cause a faster rate of bone material loss instead of a smaller peak bone mass
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Thanks.