DP Biology (first assessment 2025)
Question 19M.1A.SL.TZ2.28
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ2.28 |
| Level | SL | Paper | 1A | Time zone | TZ2 |
| Command term | Identify | Question number | 28 | Adapted from | N/A |
28.
[Maximum mark: 1]
19M.1A.SL.TZ2.28
The diagram shows a motor neuron.
[Source: © International Baccalaureate Organization 2019]
What are the biochemical nature and function of the myelin sheath?
A. The myelin sheath is mainly protein which allows growth of the axon.
B. The myelin sheath is mainly protein which acts as membrane carriers.
C. The myelin sheath is mainly lipid which allows saltatory conduction.
D. The myelin sheath is mainly lipid which provides an energy source.
[1]
Markscheme
C
Examiners report
This question had a very high discrimination index, showing only the most capable candidates were able to answer the question.
