Question 19M.2.HL.TZ1.5a
| Date | May 2019 | Marks available | [Maximum mark: 3] | Reference code | 19M.2.HL.TZ1.5a |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Outline | Question number | a | Adapted from | N/A |
Outline the functions of rough endoplasmic reticulum and Golgi apparatus.
[3]
a. ribosomes on RER synthesize/produce polypeptides/proteins ✔
b. proteins from RER for secretion/export/use outside cell/for lysosomes ✔
c. Golgi alters/modifies proteins/example of modification ✔
d. vesicles budded off Golgi transport proteins «to plasma membrane»
OR
exocytosis/secretion of proteins in vesicles from the Golgi ✔
Accept “for use inside and outside the cell” for mpb.
Most candidates had some knowledge and some had broad understanding of this topic. A common mistake was to think that the rough endoplasmic reticulum makes ribosomes. Many candidates stated that the Golgi apparatus packages proteins but they did not always mention that the packages are vesicles. If this was all that the Golgi did, vesicles from the rough ER could be used to secrete proteins. The role of the Golgi apparatus therefore involved processing or modification of proteins rather than just packaging of them.
