Which lipoproteins have a density of less than 1.006 kg/L?

• A. HDL
• B. LDL
• C. LDL and HDL
• D. Chylomicrons and VLDL

Answer: (D)

Lipoproteins are classified based on their density, which correlates with their composition of lipids and proteins. Those with a density of less than 1.006 kg/L are primarily chylomicrons and very low-density lipoproteins (VLDL).

Chylomicrons are the largest type of lipoproteins and are responsible for transporting dietary lipids from the intestine to other locations in the body. Due to their high lipid content, they have a low density. Similarly, VLDL is also characterized by a high lipid content, which includes triglycerides, making it less dense than 1.006 kg/L.

In contrast, high-density lipoprotein (HDL) is denser due to its higher protein content relative to lipids, falling typically within the density range of 1.063 to 1.210 kg/L. Low-density lipoprotein (LDL) has a density range of approximately 1.019 to 1.063 kg/L, which also places it above the 1.006 kg/L threshold. Therefore, neither HDL nor LDL fits the criterion of having a density lower than 1.006 kg/L.

This distinction in the densities helps in understanding the functional roles of these lip