Question 21M.2.SL.TZ1.3c
| Date | May 2021 | Marks available | [Maximum mark: 2] | Reference code | 21M.2.SL.TZ1.3c |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Outline | Question number | c | Adapted from | N/A |
Celiac disease is an immune reaction to eating gluten, a protein found in many cereals. The diagram shows the arrangement of normal villi and villi affected by celiac disease in the small intestine.
Wheat, barley and rye all contain gluten. Outline how a protein such as gluten is digested.
[2]
a. enzymes/protease required ✔
b. (protease/peptidase) breaks peptide bonds/bonds between amino acids ✔
c. hydrolysis adds water molecules/breaks peptide bonds between amino acids ✔
d. protein/macromolecule converted to monomer/amino acids ✔
e. endopeptidase/enzymes/protease/trypsin secreted by the pancreas ✔
Peptidase/endopeptidase can be accepted instead of protease for mpa.
mpd can be awarded for an appropriate equation.
With a basic understanding of Topic 2.4 and Topic 6.1 a candidate should have been able to answer the question appropriately. Instead several tried to make gluten into something other than an example of a protein.
