Đề thi, bài tập trắc nghiệm online Hóa sinh lipidĐề 3 – Bài tập, đề thi trắc nghiệm online Hóa sinh lipid Đăng vào 2 Tháng 5, 2026 bởi admin Đề 3 – Bài tập, đề thi trắc nghiệm online Hóa sinh lipid Đề 3 – Bài tập, đề thi trắc nghiệm online Hóa sinh lipid Số câu30Quiz ID10708 Làm bài Câu 1 1. What is the function of waxes in biological systems? A A. Primary energy storage in animals. B B. Structural component of cell membranes in bacteria. C C. Protective coating on leaves, fruits, and animal skin. D D. Precursor for steroid hormones in vertebrates. Câu 2 2. What is the role of bile salts in lipid digestion? A A. To hydrolyze triacylglycerols into fatty acids and glycerol. B B. To emulsify dietary fats, increasing the surface area for enzymatic digestion. C C. To transport fatty acids across the intestinal membrane. D D. To synthesize triacylglycerols in the intestinal cells. Câu 3 3. Which type of lipid is the most abundant component of cell membranes? A A. Triacylglycerols B B. Phospholipids C C. Steroids D D. Fatty acids Câu 4 4. Lipids are a diverse group of biomolecules that are largely hydrophobic. Which of the following is NOT a primary function of lipids in living organisms? A A. Long-term energy storage B B. Structural components of cell membranes C C. Catalysis of biochemical reactions D D. Signaling molecules (hormones) Câu 5 5. Which of the following lipids is a precursor for steroid hormones? A A. Cholesterol B B. Palmitic acid C C. Glycerol D D. Sphingosine Câu 6 6. What is the primary difference between saturated and unsaturated fatty acids? A A. Saturated fatty acids contain phosphate groups, while unsaturated fatty acids do not. B B. Saturated fatty acids contain only single bonds between carbon atoms, while unsaturated fatty acids contain at least one double bond. C C. Unsaturated fatty acids are solid at room temperature, while saturated fatty acids are liquid. D D. Saturated fatty acids are synthesized in plants, while unsaturated fatty acids are synthesized in animals. Câu 7 7. Gaucher disease is a lysosomal storage disorder caused by a deficiency in the enzyme glucocerebrosidase. Which type of lipid accumulates in this disease? A A. Cholesterol esters B B. Triacylglycerols C C. Glucocerebroside D D. Gangliosides Câu 8 8. What is the condition called that is characterized by elevated levels of ketone bodies in the blood? A A. Hyperglycemia B B. Ketoacidosis C C. Hypoglycemia D D. Hyperlipidemia Câu 9 9. What are sphingolipids primarily synthesized from? A A. Glycerol and fatty acids B B. Sphingosine and fatty acids C C. Cholesterol and fatty acids D D. Isoprenoids Câu 10 10. How many ATP molecules (approximately) can be generated from the complete oxidation of one molecule of palmitic acid (a 16-carbon saturated fatty acid)? A A. 10 B B. 32 C C. 106 D D. 256 Câu 11 11. Which lipoprotein is primarily responsible for transporting cholesterol from the liver to peripheral tissues? A A. HDL (High-Density Lipoprotein) B B. LDL (Low-Density Lipoprotein) C C. VLDL (Very-Low-Density Lipoprotein) D D. Chylomicrons Câu 12 12. Which lipid is a major component of myelin sheath, insulating nerve fibers? A A. Triacylglycerol B B. Cholesterol C C. Sphingomyelin D D. Phosphatidylserine Câu 13 13. What is the role of phospholipase A2 (PLA2)? A A. To synthesize phospholipids from fatty acids and glycerol. B B. To hydrolyze phospholipids at the sn-2 position, releasing arachidonic acid. C C. To transport phospholipids between organelles. D D. To degrade sphingolipids in lysosomes. Câu 14 14. In fatty acid biosynthesis, which molecule is the primary building block for fatty acid chains? A A. Glucose B B. Acetyl-CoA C C. Amino acids D D. Glycerol-3-phosphate Câu 15 15. Eicosanoids are derived from polyunsaturated fatty acids. Which polyunsaturated fatty acid is the primary precursor for most eicosanoids in humans? A A. Oleic acid B B. Palmitic acid C C. Arachidonic acid D D. Stearic acid Câu 16 16. What is the role of carnitine in fatty acid oxidation? A A. To activate fatty acids in the cytoplasm. B B. To transport long-chain fatty acids into the mitochondrial matrix. C C. To inhibit beta-oxidation when energy is abundant. D D. To synthesize fatty acids in the mitochondria. Câu 17 17. Which of the following is NOT a ketone body? A A. Acetoacetate B B. Beta-hydroxybutyrate C C. Acetone D D. Pyruvate Câu 18 18. Ketogenesis is the process of producing ketone bodies. Under what metabolic condition is ketogenesis typically increased? A A. High carbohydrate intake B B. Well-fed state C C. Fasting or starvation D D. Insulin-stimulated conditions Câu 19 19. Which lipid-derived molecule is involved in visual signal transduction? A A. Retinal B B. Tocopherol (Vitamin E) C C. Phylloquinone (Vitamin K) D D. Calciferol (Vitamin D) Câu 20 20. Which enzyme is the key regulatory enzyme in fatty acid biosynthesis? A A. HMG-CoA reductase B B. Acetyl-CoA carboxylase C C. Carnitine acyltransferase D D. Lipoprotein lipase Câu 21 21. What is the role of HDL (High-Density Lipoprotein)? A A. Transporting triacylglycerols from the liver to adipose tissue. B B. Transporting cholesterol from peripheral tissues back to the liver. C C. Delivering dietary lipids from the intestine to the liver. D D. Synthesizing cholesterol in peripheral tissues. Câu 22 22. Which enzyme is the target of statin drugs, commonly used to lower cholesterol levels? A A. Acetyl-CoA carboxylase B B. HMG-CoA reductase C C. Fatty acid synthase D D. Cholesterol ester transfer protein (CETP) Câu 23 23. Which of the following is a characteristic feature of lipid rafts in cell membranes? A A. They are composed primarily of unsaturated fatty acids. B B. They are highly fluid and disordered regions of the membrane. C C. They are enriched in cholesterol and sphingolipids, making them more ordered and less fluid than surrounding membrane regions. D D. They are devoid of membrane proteins. Câu 24 24. Which organ is primarily responsible for ketogenesis? A A. Brain B B. Liver C C. Muscle D D. Adipose tissue Câu 25 25. Which lipid derivative acts as a local hormone and is involved in inflammation and pain? A A. Cholesterol B B. Prostaglandins C C. Triacylglycerols D D. Phosphatidylcholine Câu 26 26. Which enzyme primarily hydrolyzes triacylglycerols in the small intestine? A A. Amylase B B. Lipase C C. Protease D D. Nuclease Câu 27 27. What are chylomicrons? A A. Enzymes that digest cholesterol in the small intestine. B B. Lipoprotein particles that transport dietary lipids from the intestine to other parts of the body. C C. Hormones that regulate lipid metabolism. D D. Structural components of cell membranes made of carbohydrates and lipids. Câu 28 28. Which of the following is an essential fatty acid that must be obtained from the diet? A A. Palmitic acid B B. Stearic acid C C. Linoleic acid (omega-6) D D. Oleic acid (omega-9) Câu 29 29. What is the impact of trans-fatty acids on human health? A A. They are beneficial for cardiovascular health. B B. They have no significant impact on health. C C. They increase LDL cholesterol and decrease HDL cholesterol, increasing the risk of cardiovascular disease. D D. They primarily affect liver function but not cardiovascular health. Câu 30 30. Where does fatty acid oxidation (beta-oxidation) primarily occur in eukaryotic cells? A A. Cytoplasm B B. Endoplasmic reticulum C C. Mitochondria D D. Golgi apparatus Đề 2 – Bài tập, đề thi trắc nghiệm online Ký sinh trùng Đề 4 – Bài tập, đề thi trắc nghiệm online Ngữ âm – âm vị học
