DP Biology (last assessment 2024)
Question 17N.3.HL.TZ0.20a.ii
| Date | November 2017 | Marks available | [Maximum mark: 3] | Reference code | 17N.3.HL.TZ0.20a.ii |
| Level | HL | Paper | 3 | Time zone | TZ0 |
| Command term | Describe | Question number | a.ii | Adapted from | N/A |
a.ii.
[Maximum mark: 3]
17N.3.HL.TZ0.20a.ii
(a.ii)
The action of thyroxin is similar to steroid hormones. Describe the action of steroid hormones.
[3]
Markscheme
a. steroid hormone passes through cell/plasma membrane
b. binds to receptor «proteins» in cytoplasm
c. receptor–hormone complex travels to nucleus
d. binds to DNA/chromatin
e. promotes/inhibits the transcription of specific genes
f. codes for/produces specific proteins
[Max 3 Marks]
