Question

Which cell organelle is concerned with glycosylation of protein:

• A. Ribosome
• B. Peroxisome
• C. Endoplasmic reticulum
• D. Mitochondria

Answer 1

The Correct Option is C

The question asks us to identify which cell organelle is responsible for the glycosylation of proteins. Let's examine the options one by one:

1. Ribosome: Ribosomes are the sites of protein synthesis in the cell. They assemble amino acids into proteins based on the sequences encoded in mRNA. However, they are not involved in the modification of these proteins, such as glycosylation.
2. Peroxisome: Peroxisomes are involved in various metabolic processes, primarily the breakdown of fatty acids and the detoxification of hydrogen peroxide. They do not play a role in protein glycosylation.
3. Endoplasmic reticulum (ER): The ER is a crucial organelle in the modification and folding of proteins. Specifically, the rough ER, which is studded with ribosomes, begins the process of glycosylation, where carbohydrate groups are added to proteins, forming glycoproteins.
4. Mitochondria: Known as the powerhouse of the cell, mitochondria are involved in energy production via the process of oxidative phosphorylation and other mitochondrial functions. They are not involved in protein glycosylation.

Based on this analysis, the correct organelle responsible for the glycosylation of proteins is the Endoplasmic reticulum. It plays a significant role in the post-translational modification of proteins, particularly in the addition of carbohydrate moieties.

In conclusion, understanding the functions of each cell organelle helps in identifying that the endoplasmic reticulum is involved in the glycosylation of proteins.