Lipid rafts are dynamic areas of exoplasmic leaflet of lipid bilayer. These are enriched in:Select one:a. Lecithinsb. Cephalinsc. Cholesterold. Glycoproteins

Lipid rafts are specialized microdomains within the cell membrane that are rich in specific lipids and proteins. To determine which option is correct from the provided choices, we can analyze each one:

1. Lecithins: These are phospholipids and can be found in membranes, but they are not specifically enriched in lipid rafts.
2. Cephalins: Another type of phospholipid, cephalins (or phosphatidylethanolamines) are less common in lipid rafts compared to other lipids.
3. Cholesterol: This is a key component of lipid rafts, providing structure and stability to these microdomains. Cholesterol helps to organize the lipids and proteins within the rafts.
4. Glycoproteins: While glycoproteins can be found in lipid rafts, they are not the defining feature of these areas.

Conclusion

The correct answer is c. Cholesterol, as lipid rafts are notably enriched in cholesterol and play a significant role in membrane fluidity and signaling.