【BIO】2018 DSE Paper1A (MC) suggested answer

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答案

1.D     2.C    3.B      4.A      5.D

6.D    7.A     8.C      9.C      10.A

11.D   12.A   13.C     14.A      15.D

16.D   17.C   18.C    19.B      20.D

21.C   22.A   23.B   24.B     25.A

26.A   27.B   28.A   29.D     30.B

31.B   32.C   33.B   34.A     35.D

36.C

1. ABC are wrong because their enzyme work inside the cell rather on cell membrane.
2. ABC maybe true but dont match the observation.
3. B, if enzyme ist reusable, no gas bubble.
4. hydrogen peroxide is a variable.
5. inverted pyramid of biomass means the producer has a very high rate of reproduction (such as protist)

6. the main point is ecological balance
7. the light behind the eye is long-sighted.
8. blood capillary and short distance can be seen.
9. DNA difference is the basic of classification.
10. Memory B cell only recognise the same pathogen.

11. A: cytoplasm, B,C: matrix, D: inner membrane.
12. the offspring is heterozygous with same genotype and only dominant present.
13. (2),(3) are essential to generate different combination of genotype. (1) seem not the "most possible".

20. (1) inter-neurone (2) sensory neurone, with cell body located on dorsal root ganglion (3) motor neurone, with long axon. X is motor neurone connecting and controlling the contraction of muscle.

25. The retention time of storage organ depends on the volume. Just like you go toilet when the urine up to certain volume. So the retention time of faeces also depends on volume so 
     larger volume = less time (assume we all agree that)
     more fibre = less time, 
     then more fibre = larger volume.
D is wrong because we cannot deduce hardness from the graph

29. C6H12O6, H2O only contribute two H for glucose (O become O2). 6C and 6O come from CO2. 
35. X is right ventricle because the online picture.

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