DP Biology (last assessment 2024)
Question 18N.2.HL.TZ0.2
| Date | November 2018 | Marks available | [Maximum mark: 4] | Reference code | 18N.2.HL.TZ0.2 |
| Level | HL | Paper | 2 | Time zone | TZ0 |
| Command term | Identify, Label, Outline | Question number | 2 | Adapted from | N/A |
2.
[Maximum mark: 4]
18N.2.HL.TZ0.2
(a.i)
Label a peptide bond in the diagram of a polypeptide.
[1]
Markscheme
Award [1] for any one of the four peptide bonds identified in this markscheme.
(a.ii)
Outline the primary structure of proteins.
[1]
Markscheme
number/sequence/order of amino acids «in a protein/polypeptide chain» ✔
(b)
Identify two hydrolysis reactions that occur in the small intestine.
[2]
Markscheme
a. polysaccharides to disaccharides/monosaccharides
OR
starch/glycogen to maltose ✔
b. sucrose to glucose AND fructose ✔
c. maltose to glucose ✔
d. lactose to glucose AND galactose ✔
e. proteins/peptides/polypeptides to shorter peptides/amino acids
OR
dipeptides to amino acids ✔
f. triglycerides/lipids/fats/oils to glycerol AND fatty acids ✔
