Question 20N.3.HL.TZ0.b
| Date | November 2020 | Marks available | [Maximum mark: 1] | Reference code | 20N.3.HL.TZ0.b |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | State | Question number | b | Adapted from | N/A |
The human stomach kills pathogenic bacteria while allowing some benefi cial bacteria to survive. The diagram shows how mucus lining the stomach helps in this process.
[Source: Kavanaugh, D., O’Callaghan, J., Kilcoyne, M., Kane, M., Joshi, L. and Hickey, R.M., 2015. The intestinal glycome and
its modulation by diet and nutrition. Nutrition Reviews, 73(6), pp.359–375 by permission of Oxford University Press on behalf
of the International Life Sciences Institute. Translated and reprinted by permission of Oxford University Press on behalf of the
International Life Sciences Institute. Please visit: https://academic.oup.com/nutritionreviews/article/73/6/359/1845190.]
State a mechanism by which the stomach destroys pathogens.
[1]
production of hydrochloric acid/HCl
This was done poorly, as most provided vague answers.
