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AQA AS/A Level Biology - Mass Transport Mark Scheme (2020-21) $11.05   Add to cart

Exam (elaborations)

AQA AS/A Level Biology - Mass Transport Mark Scheme (2020-21)

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A useful mark scheme for the separate Mass Transport workbook for students to check and improve their answers and understanding.

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  • September 28, 2022
  • 12
  • 2020/2021
  • Exam (elaborations)
  • Questions & answers
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Page 1 of 12

, Mark schemes

1




One mark for each correct row
3

(b) 16;
1

(c) 1. Higher affinity / loads more oxygen at low / same / high partial pressure / pO2;

2. (Therefore) oxygen moves from mother / to fetus;
2

(d) 1. Low affinity / oxygen dissociates;
Assume ‘it’ is adult haemoglobin
1. Accept: converse if ‘fetal haemoglobin’ is clearly stated

2. (Oxygen) to respiring tissues / muscles / cells;
2. Q: Neutral ‘respirate’
2

(e) Enough adult Hb produced / enough oxygen released / idea that curves / affinities /
Hb are similar / more red blood cells produced;
Neutral: ‘adult Hb is also produced’ as in the question stem
Reject: curves / affinities / Hb are the same
1
[9]

(a) High(er) affinity for oxygen / absorbs / loads more oxygen;
2
At lower partial pressure (of oxygen) / lower pO2;
Accept: Loads oxygen ‘quicker’, ‘more readily’, ‘higher saturation’,
use of figures from graph for first point.
Neutral: References to unloading.
2


Page 2 of 12

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