MCQs on Lipids and Biomembranes

By: Prof. Dr. Fazal Rehman | Last updated: May 22, 2025

1. : Which carries triglycerides with the highest proportion of saturated fatty acids?
(A) Sperm whale oil
(B) Butter
(C) Olive oil
(D) Beef fat

2. : What feature of vitamin E is most responsible for its antioxidant activity?
(A) It is hydrophobic
(B) It has an aromatic ring
(C) It is associated with cell membranes
(D) It contains an isoprenoid side chain

3. : Which would be most soluble in Benzene at 30°C?
(A) Stearic acid
(B) Myristic acid
(C) Palmitic acid
(D) Lauric acid

4. : How do non-steroidal anti-inflammatory drugs (NSAIDs), such as aspirin and steroid drugs reduce inflammation?
(A) They inhibit the action of prostaglandins
(B) They inhibit the activation of prostaglandins
(C) They block the formation of prostaglandins
(D) They inhibit the conversion of prostaglandins into molecules that cause inflammation

5. : The essential fatty acids are helpful in controlling which?
(A) Oedema
(B) Diabetes Mellitus
(C) Nephritis
(D) Atherosclerosis

6. : Which is different in A, B, and H antigens?
(A) Phosphate residue
(B) Sugar residue
(C) Nucleotide residue
(D) Nitrogen residue

7. : Compared to olive oil, beef fat has a higher proportion of what?
(A) Long-chain saturated fatty acids
(B) Long-chain unsaturated fatty acids
(C) Short-chain unsaturated fatty acids
(D) Short-chain saturated fatty acids

8. : Sphingolipids can contain all of the following, except:
(A) Phosphocholine
(B) Sphingosine
(C) Glycerol
(D) A mono- or oligosaccharide

9. : Phospholipases act on which type of lipids?
(A) Glycolipids
(B) Triacylglycerols
(C) Sphingolipids
(D) Glycerophospholipids

10. : Which statement is CORRECT about the difference between fats and sugars as a source of stored energy?
(A) Sugars yield more energy than fats
(B) Human body can store sugars much longer than fats
(C) Sugars are quicker source of energy because they are more soluble in water
(D) Fats are stored with more water than sugars

11. : What is the fatty acid that must be obtained from the diet by humans?
(A) Oleic
(B) Linoleic
(C) Stearic
(D) Palmitoleic

12. : Lieberman Burchard reaction is performed to detect which of the following?
(A) Fatty acids
(B) Glycerol
(C) Cholesterol
(D) Vitamin A

13. : How many double bonds are there in a molecule of Arachidonic Acid?
(A) 4
(B) 3
(C) 2
(D) 5

14. : Gangliosides are the glycolipids occurring in
(A) Liver
(B) Kidney
(C) Brain
(D) Muscle

15. : Which is not a phospholipid?
(A) Lecithin
(B) Ganglioside
(C) Cephalin
(D) Plasminogen

16. : Which is correct for the properties of triacylglycerol?
(A) They are soluble in water
(B) They readily diffuse across cell membranes.
(C) They generate more energy than the same weight of carbohydrates
(D) All of these

17. : When lecithins are exposed to air, they turn:
(A) Brown
(B) Black
(C) Red
(D) Yellow

18. : Which is NOT CORRECT about sterols?
(A) Sterols are structural lip in membranes
(B) Only eukaryotes can synthesize their own sterols.
(C) Cholesterol is a sterol.
(D) The fat-soluble vitamins are sterols

19. : The number of milliliters of 0.1 N KOH needed to neutralize the insoluble fatty acids in 5 grams of fat is called:
(A) Acid number
(B) Polanski number
(C) Halogenation
(D) Acetyl number

20. : Which fatty acids would exhibit the lowest melting temperature?
(A) Oleic
(B) Linoleic
(C) Linolenic
(D) Stearic

21. : In animal cells, where does fatty acid synthesis occur?
(A) In the endoplasmic reticulum
(B) In the cytosol
(C) In mitochondria
(D) In peroxisomes

22. : Ketosis is partly attributed to:
(A) Increased fat utilization
(B) Underproduction of glucose
(C) Increased carbohydrate utilization
(D) Overproduction of glucose

23. : What is the term associated with excretion of ketone bodies in urine?
(A) ketonuria
(B) Ketonemia
(C) Ketonosis
(D) Ketoacidosis

24. : Which of the following can be termed as a Cyclooxygenase?
(A) Mixed function oxygenase
(B) Dioxygenase
(C) A suicide enzyme
(D) All of these

25. : The major proportion of absorbed fat appears in which form?
(A) HDL
(B) LDL
(C) VLDL
(D) Chylomicrons

26. : Before the action of lipase, the fat is emulsified by which of the following?
(A) Phospholipids
(B) Lipoproteins
(C) Ergosterols
(D) Bicarbonate

27. : The most important source of reducing power for fatty acid synthesis in hepatocytes is:
(A) Pentose phosphate pathway
(B) Oxidative decarboxylation of pyruvate
(C) Malic enzyme
(D) Citrate Lyase enzyme

28. : The major function of HDL is to
(A) Deliver cholesterol from the liver to hepatic tissue
(B) Transfer cholesterol from peripheral tissue to the liver
(C) Transfer cholesterol from chylomicrons to VLDLs
(D) Catalyze the synthesis of ACAT

29. : Which lipids is used for energy storage?
(A) Glycolipids
(B) Triacylglycerols
(C) Sphingolipids
(D) Glycerophosphates

30. : Which carbon number in stearic acid is the beta-carbon?
(A) C-3
(B) C-2
(C) C-18
(D) C-4

31. : The fatty acids containing even number and odd number of carbon atoms as well as the unsaturated fatty acids are oxidized by:
(A) γ-Oxidation
(B) α-Oxidation
(C) β-Oxidation
(D) All of these

32. : The reduction of cholesterol by intestinal bacteria results in fecal excretion of
(A) Ergosterols
(B) Lanosterol
(C) Dolichol
(D) Coprosterol

33. : The “committed step” in the biosynthesis of cholesterol is:
(A) Formation of acetoacetyl CoA from acetyl CoA
(B) Formation of mevalonate from HMG-CoA
(C) Formation of HMG-CoA
(D) Formation of squalene by synthase

34. : Lipoprotein A may be associated with which of the following?
(A) Increased risk for atherosclerosis
(B) Prevention of lipid peroxidation
(C) Wound healing and cell repair
(D) All of these

35. : Which is correct about fatty acid synthase of vertebrates?
(A) It generates NADPH
(B) Its principal product is stearate
(C) It is a complex of seven polypeptides
(D) It has a flexible phosphopantetheine arm

36. : Fatty liver may be caused by the deficiency of which of the following?
(A) Stearic acid
(B) Vitamin A
(C) Caproic acid
(D) Pantothenic acid