Answer: Rough ER and Golgi apparatus.
- A Nucleus, where transcription factors are modified before translation
- B Mitochondria, during oxidative phosphorylation of matrix proteins
- C Rough ER and Golgi apparatus
- D Ribosome, immediately as the polypeptide chain emerges
Correct answer: C. Rough ER and Golgi apparatus
Explanation: N-linked glycosylation begins in the rough ER; O-linked glycosylation occurs in the Golgi. Both add carbohydrate groups to proteins.
Animal cell structure with major organelles labeled. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Cell theory, prokaryotic vs eukaryotic cells, organelles and their functions. Foundation of all biology.