Lipids 1 PDF - Past Paper

A) C3H8O3 MCQs on lipids 1 B) C6H12O6 C) C5H10O5 Which of the following best describes.1 ?lipids...

A) C3H8O3 MCQs on lipids 1 B) C6H12O6 C) C5H10O5 Which of the following best describes.1 ?lipids D) C4H8O2 A) Water-soluble compounds B) Insoluble in non-polar solvents Essential fatty acids are called.5 :"essential" because C) Soluble in non-polar solvents A) They provide insulation D) Made of only carbohydrates and proteins B) The body cannot synthesize them C) They are needed for cell respiration What is the primary role of lipids in cell.2 D) They are abundant in animal fats ?membranes A) Energy storage :Saturated fatty acids have.6 B) Structural component A) At least one double bond C) Protein synthesis B) No double bonds D) Vitamin production C) Only cis double bonds D) Only trans double bonds Which type of lipid provides thermal.3 ?insulation in the body A) Glycerol Which fatty acid is commonly found in.7 ?vegetable oils B) Fatty acids A) Palmitic acid C) Phospholipids B) Oleic acid D) Triglycerides C) Stearic acid D) Myristic acid What is the molecular formula for.4 ?glycerol What distinguishes triacylglycerols from.8 C) Glycolipids ?phospholipids D) Eicosanoids A) Triacylglycerols are charged B) Phospholipids contain a phosphate group :Lecithins are examples of.12 C) Both contain three fatty acids A) Simple lipids D) Triacylglycerols have a glycerol B) Phospholipids backbone C) Steroids D) Waxes Eicosanoids are derived from which.9 ?type of fatty acid A) Saturated fatty acids What process involves the addition of.13 ?hydrogen to oils to make them solid B) Trans fats A) Saponification C) Polyunsaturated fatty acids B) Esterification D) Monounsaturated fatty acids C) Hydrogenation D) Transesterification The bond between glycerol and fatty.10 :acids in triacylglycerols is a A) Hydrogen bond Which type of lipid is involved in nerve.14 ?transmission B) Ionic bond A) Lecithins C) Covalent bond B) Phosphatidylethanolamine D) Ester bond C) Triacylglycerols D) Sphingomyelins Which lipid serves as a precursor to.11 ?vitamin D A) Cholesterol Which molecule is the precursor to.15 ?prostaglandins B) Phospholipids A) Cholesterol  B) Linoleic acid A) Vitamin C C) Arachidonic acid B) Vitamin B D) Stearic acid C) Vitamin E D) Vitamin B12 What property is characteristic of.16 ?unsaturated fatty acids :Arachidonic acid can be classified as.20 A) High melting point A) A saturated fatty acid B) Insolubility in water B) A monounsaturated fatty acid C) Presence of double bonds C) A polyunsaturated fatty acid D) Solubility in water D) A short-chain fatty acid :Hydrolytic rancidity is caused by.17 Glycerophospholipids play a crucial.21 A) Oxidation :role in B) Bacterial enzymes A) Storing energy C) Light exposure B) Forming cell membranes D) Addition of hydrogen C) Hormone synthesis D) Vitamin D synthesis Which lipid has an alcohol backbone.18 ?other than glycerol The structure that contains a.22 A) Phospholipids :cyclopentane ring is B) Glycolipids A) Cholesterol C) Waxes B) Lecithin D) Sphingolipids C) Triacylglycerol D) Stearic acid ?Which vitamin is fat-soluble.19  Which fatty acid is an essential.23 ?omega-3 fatty acid Which component is NOT found in a.27 A) Palmitic acid ?triglyceride molecule B) Oleic acid A) Glycerol C) α-Linolenic acid B) Fatty acids D) Arachidonic acid C) Phosphate group D) Ester bonds Phosphatidylcholine is commonly.24 :known as Which of the following lipids acts as a.28 A) Cephalin ?precursor for bile acids B) Lecithin A) Sphingomyelin C) Sphingomyelin B) Cholesterol D) Cholesterol C) Phosphatidylcholine D) Glycolipids Which enzyme is responsible for.25 ?synthesizing prostaglandins Eicosanoids have which primary.29 A) Cyclooxygenase ?function in the body B) Lipase A) Energy storage C) Lipoxygenase B) Structural support D) Hydrolase C) Local hormone activity D) Vitamin synthesis :Cholesterol is primarily synthesized in.26 A) The intestines ?Which of the following is a glycolipid.30 B) The liver A) Cholesterol C) The brain B) Galactocerebroside D) The pancreas  C) Phosphatidylcholine A) Hydrogenation D) Stearic acid B) Saponification C) Oxidation Which fatty acid is most abundant in.31 ?natural fats D) Hydrolysis A) Oleic acid B) Stearic acid Which type of rancidity is caused by.35 ?bacterial action on fats C) Palmitic acid A) Oxidative rancidity D) Linoleic acid B) Hydrolytic rancidity C) Ketonic rancidity The omega (ω) numbering system for.32 :fatty acids starts from D) All of the above A) The carboxyl group B) The methyl end :Lipoproteins are essential for.36 C) The hydroxyl group A) Storing vitamins D) The ester bond B) Transporting lipids in blood C) Synthesizing proteins Which fatty acid is associated with the.33 D) Forming bone structures risk of cardiovascular diseases when ?consumed in excess A) Linoleic acid :Saturated fatty acids tend to be.37 B) Palmitic acid A) Liquid at room temperature C) Oleic acid B) Solid at room temperature D) Arachidonic acid C) Highly reactive D) Completely odorless The process of adding oxygen to.34 :unsaturated fatty acids is known as  Which lipid is primarily found in the.38 D) Arachidonic acid ?brain and nervous tissue A) Phosphatidylcholine Which lipid is used as a base for.42 B) Sphingomyelin ?cosmetics and ointments C) Triglyceride A) Steroids D) Linoleic acid B) Triglycerides C) Waxes Which lipid is classified as a.39 D) Phospholipids ?sphingophospholipid A) Lecithin Which vitamin deficiency leads to.43 B) Cephalin ?rickets in children C) Cardiolipin A) Vitamin A D) Sphingomyelin B) Vitamin C C) Vitamin D What is the role of.40 D) Vitamin E ?phosphatidylethanolamine in the body A) Major storage form of energy In which of the following reactions is.44 B) Component of nerve cell membranes ?glycerol phosphorylated C) Precursor of bile salts A) Formation of triacylglycerol D) Major component of hemoglobin B) Formation of glycerol-3-phosphate C) Esterification of fatty acids Which type of fatty acid does not occur.41 D) Degradation of fatty acids ?naturally in trans form A) Palmitic acid Which lipid is present mainly in animal.45 B) Linoleic acid ?products C) Oleic acid A) Lecithin  B) Cholesterol Linoleic acid is an essential fatty acid.49 ?of which type C) Glucosylceramide A) Omega-3 D) Linoleic acid B) Omega-6 C) Omega-9 Which process helps prevent lipid.46 ?peroxidation in the body D) Saturated A) Rancidity B) Antioxidants Which fatty acid is converted to.50 ?arachidonic acid in the body C) Ketogenesis A) Oleic acid D) Hydrogenation B) Palmitic acid C) Linoleic acid Prostacyclins have which function in.47 ?the blood vessels D) Stearic acid A) Stimulate platelet aggregation B) Cause vasoconstriction The terminal methyl carbon in fatty.51 :acids is known as C) Inhibit platelet aggregation A) Alpha carbon D) Increase cholesterol levels B) Beta carbon C) Omega carbon Which lipid serves as an intermediate.48 ?in the synthesis of triacylglycerols D) Delta carbon A) Phosphatidic acid B) Arachidonic acid Which lipid is a major component of.52 ?mitochondrial membranes C) Sphingomyelin A) Cardiolipin D) Ceramide B) Phosphatidylcholine C) Lecithin  D) Triglyceride B) Hydrocarbon chains C) Phosphate groups What is a key feature of cis fatty.53 D) Double bonds ?acids A) Double bonds in trans configuration The energy value of 1 gram of fat is.57 B) Double bonds in cis configuration :approximately C) No double bonds A) 4 Kcal D) Solid at room temperature B) 9.6 Kcal C) 7 Kcal Arachidonic acid belongs to which.54 D) 5.5 Kcal ?fatty acid family A) Omega-3 Which lipid contains both a fatty acid.58 B) Omega-6 ?and a carbohydrate molecule C) Omega-9 A) Phospholipid D) Omega-12 B) Steroid C) Glycolipid Which type of fatty acid has only one.55 D) Triglyceride ?double bond A) Saturated fatty acid Which factor decreases the melting.59 B) Polyunsaturated fatty acid ?temperature of a fatty acid C) Mono-unsaturated fatty acid A) Increased chain length D) Trans fatty acid B) Decreased number of double bonds C) Presence of cis double bonds Hydrophobic characteristics of lipids.56 D) Saturation of all bonds :are primarily due to A) Glycerol backbone  Which of the following is a.60 B) Oleic acid ?characteristic of omega-3 fatty acids C) Linoleic acid A) They are saturated fats D) Arachidonic acid B) They contain one double bond C) They are found in fish oils The fatty acid commonly referred to as.64 :C18:2 is D) They are synthesized in the body A) Palmitic acid Which enzyme is responsible for.61 ?synthesizing leukotrienes B) Stearic acid C) Linoleic acid A) Cyclooxygenase D) Oleic acid B) Lipase The hydrophobic nature of lipids is.65 C) Lipoxygenase :mainly due to D) Hydrolase A) Hydroxyl groups What is the primary storage form of.62 ?energy in animals B) Long hydrocarbon chains C) Presence of oxygen atoms A) Glucose D) High solubility in water B) Glycogen Which of the following is a feature of.66 C) Triacylglycerol ?waxes D) Phospholipid A) Liquid at room temperature Which fatty acid is commonly found in.63 ?butter and is solid at room temperature B) Contain a phosphate group C) Esters of long-chain alcohols A) Stearic acid D) Found in mitochondria  A) Saturated fatty acid What type of lipid is most prevalent in.67 ?the myelin sheath B) Monounsaturated fatty acid C) Polyunsaturated fatty acid A) Triacylglycerol D) Short-chain fatty acid B) Phosphatidylcholine Which phospholipid is abundant in the.71 C) Sphingomyelin ?liver cell membrane D) Cholesterol A) Phosphatidylcholine Which lipid is the precursor for steroid.68 ?hormones B) Phosphatidylinositol C) Phosphatidylethanolamine A) Sphingolipid D) Cardiolipin B) Cholesterol What type of molecule is formed when.72 C) Triacylglycerol ?a fatty acid bonds with glycerol D) Phosphatidic acid A) Steroid Which lipid acts as an electrical.69 ?insulator for nerve fibers B) Phospholipid C) Triacylglycerol A) Lecithin D) Glycolipid B) Triglycerides Which type of lipid is most associated.73 C) Myelin sheath lipids ?with membrane fluidity D) Eicosanoids A) Cholesterol Which fatty acid is most likely to.70 ?undergo rancidity B) Triacylglycerol C) Sphingomyelin  D) Fatty acids What type of lipid is involved in the.74 A) Presence of hydroxyl groups ?synthesis of eicosanoids B) Chain length and degree of saturation C) Carbon atom number only A) Cholesterol D) Glycerol content B) Triacylglycerol C) Arachidonic acid What type of lipid is a major storage.78 ?form in seeds and fruits D) Phospholipid Which lipid component of cell.75 A) Glycolipid membranes is known for its amphipathic ?properties B) Triglyceride C) Phospholipid A) Phospholipids D) Sphingolipid B) Cholesterol Which essential fatty acid has three.79 C) Triglycerides ?double bonds D) Fatty acids A) Linoleic acid What is the primary function of bile.76 ?acids B) α-Linolenic acid C) Oleic acid A) Hormone synthesis D) Arachidonic acid B) Aid in lipid digestion Which of the following is an example.80 C) Energy storage ?of a phospholipid D) Transport proteins A) Galactocerebroside What property of fatty acids affects.77 ?their melting point B) Cholesterol  36. B C) Lecithin 37. B 38. B D) Stearic acid 39. D 40. B 41. B 42. C.…… 43. C 44. B 45. B ANSWERS 46. B 47. C 48. A 1. C 49. B 2. B 50. C 3. D 51. C 4. A 52. A 5. B 53. B 6. B 54. B 7. B 55. C 8. B 56. B 9. C 57. B 10. D 58. C 11. A 59. C 12. B 60. C 13. C 61. C 14. D 62. C 15. C 63. A 16. C 64. C 17. B 65. B 18. D 66. C 19. C 67. C 20. C 68. B 21. B 69. C 22. A 70. C 23. C 71. C 24. B 72. C 25. A 73. A 26. B 74. C 27. C 75. A 28. B 76. B 29. C 77. B 30. B 78. B 31. A 79. B 32. B 80. C 33. B 34. C 35. B