9700_s03_er - 9700 Biology June 2003 FOREWORD 1 BIOLOGY 2...

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9700 Biology June 2003 1 FOREWORD ....................................................................................................................... 1 BIOLOGY ............................................................................................................................ 2 GCE Advanced Level and GCE Advanced Subsidiary Level ...................................................................... 2 Paper 9700/01 Multiple Choice ..................................................................................................................... 2 Paper 9700/02 Paper 2 ................................................................................................................................. 3 Paper 9700/03 Practical ................................................................................................................................ 7 Paper 9700/04 Paper 4 ................................................................................................................................. 8 Paper 9700/05 Practical 2 ........................................................................................................................... 10 Paper 9700/06 Options ............................................................................................................................... 11 This booklet contains reports written by Examiners on the work of candidates in certain papers. Its contents are primarily for the information of the subject teachers concerned .
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9700 Biology June 2003 2 GCE Advanced Level and GCE Advanced Subsidiary Level Paper 9700/01 Multiple Choice Question Number Key Question Number Key 1 D 21 D 2 A 22 B 3 C 23 B 4 C 24 A 5 A 25 C 6 C 26 C 7 D 27 B 8 A 28 B 9 B 29 C 10 A 30 D 11 B 31 A 12 C 32 C 13 B 33 C 14 C 34 D 15 D 35 B 16 A 36 B 17 D 37 D 18 A 38 B 19 C 39 B 20 C 40 C General comments The mean score for this Paper was 27.3 (68.3%) and there was a very good spread of scores, the standard deviation being 5.8. Eleven items were answered correctly by 80% or more of candidates, Questions 2 , 5 , 8 , 12 , 17 , 24 , 26 , 27 , 31 , 35 and 37 . Four questions were difficult; fewer than 40% of candidates answered Questions 6 , 22 , 30 and 36 correctly. Comments on specific questions Question 6 Both the better candidates and the less able seemed to be baffled by this question. It requires application of the knowledge of how plant cells behave when immersed in a solution with a water potential near to zero (syllabus section A(k)). Question 8 Candidates had no difficulty recognising a glycosidic bond and its formation by condensation.
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9700 Biology June 2003 3 Question 14 A majority understood that there would be no reaction above 50°C but weaker candidates, in particular, did not pay sufficient attention to the label on the y axis. Question 1 The terms chromatid and centromere were very well known. Question 18 Option B was a popular incorrect answer. A separate tRNA molecule is not required for each of the ten amino acids because each of the tRNA molecules, specific to one of the four kinds of amino acid, can be reused. Question 22 Most candidates knew that pulmonary arteries carry deoxygenated blood. However, there is a common misconception that this blood is devoid of oxygen. Question 28 The popularity of option D reveals that many candidates, including the more able, are uncertain whether alveoli contain smooth muscle. Question 30 Only the most able knew that the amount of oxygen delivered to the muscles is limited by the volume of blood flowing to them. The more popular answer was that the limitation is due to the speed of dissociation of oxyhaemoglobin. Evidently it is not generally appreciated how quickly dissociation occurs. Question 33 The long-term consequences of alcohol consumption on the liver (syllabus section J(e)) were not well known. Question 36 More chose option C than chose the correct option, B . The graph shows that after the first exposure to the antigen there was a five-day delay before the rise in antibody concentration. After a second exposure, a rise would occur after an interval of less than five days due to the ability of memory cells to respond immediately.
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