DP Biology (first assessment 2025)
Question 19M.1A.SL.TZ2.7
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.1A.SL.TZ2.7 |
| Level | SL | Paper | 1A | Time zone | TZ2 |
| Command term | Identify | Question number | 7 | Adapted from | N/A |
7.
[Maximum mark: 1]
19M.1A.SL.TZ2.7
The diagram shows two polysaccharides, formed from condensation of many glucose molecules.
[Source: © International Baccalaureate Organization 2019]
What are the names of X and Y?
[1]
Markscheme
A
Examiners report
Many candidates wrongly believed the diagram of X could easily be amylopectin (instead of glycogen) whilst Y has to be amylose, this led to students spending more time on the question. Some candidates confused amylose with the enzyme amylase, but the question clearly stated that two carbohydrates were shown.
