DP Biology (last assessment 2024)
Question 19N.3.HL.TZ0.22
| Date | November 2019 | Marks available | [Maximum mark: 6] | Reference code | 19N.3.HL.TZ0.22 |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Distinguish, Identify, Suggest | Question number | 22 | Adapted from | N/A |
22.
[Maximum mark: 6]
19N.3.HL.TZ0.22
(a)
Athletes taking growth hormones show an increase in their sprinting capacity. This is not maintained after discontinuing the drug. Suggest one reason for the disappearance of the effect.
[1]
Markscheme
growth hormone/drug no longer present «in blood» OWTTE
OR
lack of hormones reduce «gained» muscle mass/strength ✔
(b)
Distinguish between the mode of action of steroid hormones and peptide hormones.
[3]
Markscheme
Award [1 mark] for each complete row, up to [3 max].
Apply ECF the second time plasma is omitted and award the mark.
(c)
Identify with reasons whether the pituitary gland is an exocrine or endocrine gland.
[2]
Markscheme
a. endocrine gland ✔
b. «ductless gland that» secretes hormones directly into the bloodstream ✔