DP Biology (last assessment 2024)
Question 18N.2.SL.TZ0.a.ii
| Date | November 2018 | Marks available | [Maximum mark: 3] | Reference code | 18N.2.SL.TZ0.a.ii |
| Level | SL | Paper | 2 | Time zone | TZ0 |
| Command term | Describe | Question number | a.ii | Adapted from | N/A |
a.ii.
[Maximum mark: 3]
18N.2.SL.TZ0.a.ii
Cellulose is the most abundant organic polymer on Earth. Describe the structure of cellulose.
[3]
Markscheme
a. unbranched/straight chain of glucose molecules
OR
unbranched/straight-chain polysaccharide ✔
b. formed of beta glucose;
c. formed by condensation reactions/glycosidic bonds
OR
1, 4 linkage ✔
d. hydrogen bonds form between cellulose chains
e. form microfibrils ✔
Award marks to an accurate annotated diagram
Do not allow carbohydrate
