DP Biology (last assessment 2024)

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Question 17N.2.SL.TZ0.g

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Date November 2017 Marks available [Maximum mark: 2] Reference code 17N.2.SL.TZ0.g
Level SL Paper 2 Time zone TZ0
Command term List Question number g Adapted from N/A
g.
[Maximum mark: 2]
17N.2.SL.TZ0.g

The graph shows the relationship between the diffusion capacity of the lungs for carbon monoxide (CO) and urine desmosines.

[Source: Reproduced with permission of the © ERS 2012. European Respiratory Journal Apr 2012, 39 (4) 839–845; DOI: 10.1183/09031936.00064611]

Other studies on pulmonary diseases have shown a wide variety of results. Apart from age, sex and severity of COPD, list two other factors that may explain the inconsistent results between studies.

[2]

Markscheme

a. «small» sample size

    OR

    only studied in one country

b. methods used

c. environment/pollution/workplace exposure

d. race/genetic factors

e. health status/fitness/BMI of volunteers

[Max 2 Marks]

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