DP Biology (last assessment 2024)
Question 18M.3.HL.TZ1.d
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.3.HL.TZ1.d |
| Level | HL | Paper | 3 | Time zone | TZ1 |
| Command term | Explain | Question number | d | Adapted from | N/A |
d.
[Maximum mark: 2]
18M.3.HL.TZ1.d
Many animals, including humans, maintain strongly acidic conditions in part of their digestive systems. Explain two benefits of this to the animal.
[2]
Markscheme
a. provides ideal pH for stomach enzyme activity
b. (acidic conditions) denature proteins /start breakdown of other organic substances
c. (acidic conditions) convert pepsinogen (inactive) into pepsin
d. (acidic conditions) destroy pathogens in ingested food
