What is formed when re-esterified lipids combine with apoprotein-B?

When re-esterified lipids combine with apoprotein-B, they form chylomicrons, which are large lipoprotein particles responsible for transporting dietary lipids from the intestines to other locations in the body.

Chylomicrons primarily consist of triglycerides that are packaged within a layer of phospholipids and proteins, including apoprotein-B. The presence of apoprotein-B is crucial for the structural integrity of the chylomicron and plays a key role in its interaction with other cells, facilitating the uptake of lipids by tissues. This process is essential for lipid metabolism and energy storage.

In contrast, cholesterol, triglycerides, and phospholipids are components that may be involved in lipid transport but do not represent the combined structure formed with apoprotein-B. Each of those molecules serves a specific metabolic role, but they do not directly form chylomicrons when combined with apoprotein-B. Thus, the formation of chylomicrons is a specialized process that highlights the functionality of lipoproteins in lipid transport.