RS-T10-Q19 · 呼吸商 RQ「计算与判读」

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 34:00–36:20）

来源 9700_s25_qp_44.pdf → 9700_s25_ms_44.pdf　|　小问：全部小问

触发题型：看到 RQ / 问 RQ = ? / 问由 RQ 推断底物 / 问 RQ>1 说明什么

✅ 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）

10(a)(i)

1. molecules / moles / volume, carbon dioxide produced
2. molecules / moles / volume, oxygen taken in ;

10(a)(ii)

1. 25 ;

10(a)(iii)

1. 0.72 ;
2. A ecf 18 divided by their answer to 10(a)(ii)

10(b)

1. any four from:
2. RQ (initially) at 1.0 as, carbohydrates / (named) sugar, respired / metabolised ;
3. RQ decreases (over time) as, carbohydrates / (named) sugar, running out / used up ;
4. RQ decreases (over time) as a mixture of carbohydrate and lipid respired ;
5. I proteins
6. RQ at, 0.65 / 0.7, as, fatty acids / fats / lipids, respired (as main respiratory substrate)
7. or
8. from 120 min onwards, fatty acids / fats / lipids, respired (as main respiratory substrate) ;
9. data quote ; RQ of 1.0 at 40 min plus any RQ value at any other time
10. Time after
11. feeding / min
12. RQ ratio
13. 1.0
14. 0.75
15. 0.7
16. 0.65
17. 0.7
18. 0.7