RS-T11-Q21 · 呼吸数据「分析 · 评价 · P5 衔接」

先自己写完再对答案；卡住的地方回看这段讲解（公开课时间码 36:20–38:40）

来源 9700_s25_qp_54.pdf → 9700_s25_ms_54.pdf　|　小问：全部小问

触发题型：看到呼吸实验数据表/曲线 / 问 conclusion、evaluation、改进设计（P5 衔接）

✅ Mark Scheme 得分点（原文）

逐条计分：n 分写 n 条；红字为考官明确不接受（Do not accept）

2(a)

1. any one from:
2. idea that (cold buffer) prevents, (mitochondrial) enzymes / proteins , denaturing ;
3. idea that (cold temperature) prevents damage to mitochondria, by enzymes ;
4. idea that (buffer) prevents (osmotic) lysis of mitochondria ;

2(b)(i)

1. 49.50 ;

2(b)(ii)

1. correct identification of anomalous results ;;
2. rate of oxygen consumption
3. trial 1
4. trial 2
5. trail 3
6. trial 4
7. mean
8. mitochondria alone
9. 0.03
10. 0.02
11. 0.03
12. 0.01
13. 0.02
14. succinate added
15. 50.22
16. 49.10
17. 48.53
18. 50.15
19. 49.50
20. ADP and succinate
21. added
22. 139.23
23. 170.10
24. 142.67
25. 138.10
26. 147.53
27. ADP, succinate and
28. cyanide added
29. 0.00
30. 0.10
31. 0.00
32. 0.01
33. 0.03

2(b)(iii)

1. do not include, anomalies and calculate (a more accurate) mean ;
2. calculate, standard deviation / standard error / 95% confidence limits (for each trial) ;

2(c)

1. any three from:
2. in mitochondria (alone):
3. oxygen concentration does not change
4. or
5. do not use oxygen
6. or
7. rate of oxygen consumption is very low ;
8. adding succinate (and no ADP) increases the rate of, aerobic respiration / Krebs cycle / oxidative phosphorylation ;
9. adding succinate and ADP, gives a larger increase in the rate of, aerobic respiration / Krebs cycle / oxidative
10. phosphorylation ;
11. oxygen acts as the final electron acceptor (in aerobic respiration / oxidative phosphorylation) ;
12. adding cyanide stops, (aerobic) respiration / oxidative phosphorylation ;