Biochemistry - MCQ Practice Questions

Which of the following lipids is NOT a structural component of cell membranes?

The rate-limiting enzyme in de novo fatty acid synthesis is:

Beta-oxidation of fatty acids occurs primarily in which cellular compartment?

Which of the following statements about HDL (High-Density Lipoprotein) is CORRECT?

Linoleic acid (18:2) and alpha-linolenic acid (18:3) are classified as:

The conversion of acetyl-CoA to malonyl-CoA is inhibited by:

A 35-year-old male presents with recurrent yellow nodules on his elbows and knees with serum cholesterol of 450 mg/dL. What is the most likely diagnosis?

Which lipoprotein has the highest ratio of protein to lipid?

The ketone bodies produced during beta-oxidation are synthesized in which tissue?

What is the primary function of apolipoprotein B-100?

Niemann-Pick disease Type C is characterized by defective intracellular lipid transport due to mutation in genes encoding:

During fed state, the conversion of carbohydrates to fat is promoted by insulin through which mechanism?

Which of the following correctly describes the relationship between LDL particle size and cardiovascular risk?

A patient with Tangier disease shows extremely low HDL levels (<5 mg/dL). This condition results from defective:

In the carnitine shuttle system, carnitine palmitoyltransferase I (CPT-I) is inhibited by:

Which of the following conditions would result in elevated levels of lipoprotein(a) (Lp(a))?

A 50-year-old female with hypothyroidism presents with elevated cholesterol. Which mechanism explains the increased cholesterol in hypothyroidism?

The oxidative stress marker oxidized LDL (oxLDL) primarily activates which receptor to promote foam cell formation?

Which of the following statements about LCAT (Lecithin-cholesterol acyltransferase) is INCORRECT?

In Type III hyperlipoproteinemia (Familial Dysbetalipoproteinemia), the primary defect involves: