Which of the following is a characteristic of low-density lipoprotein (LDL)?

• A. Primarily composed of triglycerides
• B. Synthesized in the mitochondria
• C. Known as 'good cholesterol'
• D. Transports cholesterol from the liver to peripheral tissues

Answer: (D)

Verified step by step guidance

1. Understand the role of lipoproteins in the body: Lipoproteins are molecules that transport lipids (fats) through the bloodstream. They are classified based on their density, which is determined by the proportion of protein to lipid content.
2. Learn the characteristics of low-density lipoprotein (LDL): LDL is primarily responsible for transporting cholesterol from the liver to peripheral tissues. It has a lower protein-to-lipid ratio compared to high-density lipoprotein (HDL).
3. Differentiate LDL from other lipoproteins: LDL is often referred to as 'bad cholesterol' because high levels of LDL can lead to plaque buildup in arteries, increasing the risk of cardiovascular diseases. HDL, on the other hand, is known as 'good cholesterol' because it helps transport cholesterol back to the liver for excretion.
4. Eliminate incorrect options: LDL is not primarily composed of triglycerides (this is a characteristic of very-low-density lipoproteins, VLDL), nor is it synthesized in the mitochondria. Additionally, LDL is not considered 'good cholesterol.'
5. Confirm the correct answer: Based on the information, the characteristic of LDL is that it transports cholesterol from the liver to peripheral tissues.