ApoB is a protein component of which lipoprotein?

ApoB is a protein component of which lipoprotein?

• A. HDL
• B. VLDL
• C. LDL
• D. IDL

Answer: (C)

Apolipoprotein B acts as the structural and receptor-binding protein for several lipoproteins, with the form ApoB-100 being the one present on LDL particles. ApoB-100 is produced in the liver and enables LDL, as well as VLDL and IDL, to bind the LDL receptor and deliver cholesterol to tissues. In contrast, chylomicrons carry ApoB-48, and HDL is centered around ApoA-I. Among the options, LDL is the lipoprotein class most consistently described as containing ApoB-100, making it the best match.

Apolipoprotein B acts as the structural and receptor-binding protein for several lipoproteins, with the form ApoB-100 being the one present on LDL particles. ApoB-100 is produced in the liver and enables LDL, as well as VLDL and IDL, to bind the LDL receptor and deliver cholesterol to tissues. In contrast, chylomicrons carry ApoB-48, and HDL is centered around ApoA-I. Among the options, LDL is the lipoprotein class most consistently described as containing ApoB-100, making it the best match.