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51.

When cross sectional area of the head group and acyl side chain is similar, which of the following lipid aggregates formation is favored?(a) Micelles(b) Bilayer(c) Liposome(d) Myelin sheathI have been asked this question by my college director while I was bunking the class.The above asked question is from The Composition and Architecture of Membranes topic in portion Lipids, Biological Membranes and Transport of Biochemistry

Answer»

Correct CHOICE is (b) Bilayer

Explanation: Bilayer FORMATION is favored when cross sectional AREA of the HEAD group and ACYL side chain is similar.

52.

Which of the following transports only one kind of substrate?(a) Uniport carriers(b) Symport carriers(c) Antiport carriers(d) Membrane proteinsI had been asked this question during an online interview.Origin of the question is Solute Transport across Membranes topic in portion Lipids, Biological Membranes and Transport of Biochemistry

Answer» RIGHT ANSWER is (a) Uniport carriers

For EXPLANATION I would SAY: Symport carriers move two or more substrates in the same direction across the membrane.

Antiport carriers move substrates in the opposite direction.
53.

Which of the following acts as a passive electrical insulator?(a) Myelin sheath(b) Plasma membrane(c) Inner mitochondrial membrane(d) Outer mitochondrial membraneThis question was posed to me during an online exam.I would like to ask this question from The Composition and Architecture of Membranes in section Lipids, Biological Membranes and Transport of Biochemistry

Answer»

The CORRECT option is (a) MYELIN SHEATH

To explain: Myelin sheath acts as a PASSIVE ELECTRICAL insulator.

54.

Which of the following is an example of peripheral membrane protein?(a) Insulin receptor(b) Glycophorin(c) Integrin(d) Glycolipid transfer proteinsI got this question in unit test.This intriguing question originated from Membrane Dynamics in portion Lipids, Biological Membranes and Transport of Biochemistry

Answer»

The correct OPTION is (d) Glycolipid transfer proteins

The explanation is: Insulin receptor, GLYCOPHORIN and integrin are INTEGRAL MEMBRANES.

55.

Phosphatidylinositol, phosphatidylglycerol and phosphatidylserine are easily separated by __________(a) Absorption chromatography(b) TLC(c) HPLC(d) Gas-liquid chromatographyThe question was asked in an interview for job.Asked question is from Working with Lipids topic in section Lipids, Biological Membranes and Transport of Biochemistry

Answer»

Right option is (B) TLC

The best EXPLANATION: TLC can EASILY separate PHOSPHATIDYLINOSITOL, phosphatidylglycerol and PHOSPHATIDYLSERINE.

56.

What is the head-group alcohol in plasmolegen and platelet-activating factor?(a) Alkene(b) Choline(c) Alkane(d) Acetic acidI had been asked this question in my homework.Enquiry is from Structural Lipids in Membranes topic in portion Lipids, Biological Membranes and Transport of Biochemistry

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The correct option is (b) CHOLINE

For EXPLANATION I WOULD say: Choline is the head-group alcohol in plasmolegen and platelet-activating FACTOR.

57.

HCO3^– – Cl^– transporter is an example of ____________(a) Uniport(b) Antiport(c) Symport(d) Facilitated diffusionI had been asked this question in an international level competition.This is a very interesting question from Solute Transport across Membranes topic in portion Lipids, Biological Membranes and Transport of Biochemistry

Answer» CORRECT choice is (b) Antiport

To explain: Substrates are MOVED in the OPPOSITE DIRECTION.
58.

When does saturation occur?(a) When molecules are moved by the use of vesicles(b) When the energy from a high-energy bond is required to move molecules(c) When a group of carrier proteins is operating at its maximum rate(d) When a carrier molecule has the ability to transport only one molecule or a group of closely related moleculesI have been asked this question in examination.I'd like to ask this question from Solute Transport across Membranes in chapter Lipids, Biological Membranes and Transport of Biochemistry

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Right CHOICE is (c) When a GROUP of CARRIER proteins is operating at its maximum RATE

Explanation: When a group of carrier proteins is operating at its maximum rate saturation OCCURS.

59.

Plasma membrane is permeable to __________(a) ATP(b) Glucose(c) K^+(d) UreaThis question was addressed to me in an internship interview.This question is from The Composition and Architecture of Membranes topic in chapter Lipids, Biological Membranes and Transport of Biochemistry

Answer»

Correct OPTION is (d) Urea

Explanation: Plasma MEMBRANE is impermeable to ATP, GLUCOSE and K^+.

60.

Which of the following glycerophospholipids is not common in inner leaflet (cytoplasmic)?(a) Phosphatidylserine(b) Phosphatidylethanolamine(c) Phosphatidylinositol(d) PhosphatidylcholineThe question was asked during an online interview.The origin of the question is The Composition and Architecture of Membranes in portion Lipids, Biological Membranes and Transport of Biochemistry

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Correct answer is (d) PHOSPHATIDYLCHOLINE

Explanation: Phosphatidylcholine is COMMON in OUTER leaflet.

61.

Which of the following is choline containing lipid?(a) Sphingomyelin(b) Phosphatidylserine(c) Phosphatidylglycerol(d) PhosphatidylethanolamineI have been asked this question during an online exam.I'd like to ask this question from The Composition and Architecture of Membranes topic in section Lipids, Biological Membranes and Transport of Biochemistry

Answer» RIGHT ANSWER is (a) Sphingomyelin

To EXPLAIN: PHOSPHATIDYLCHOLINE and sphingomyelin PRESENT in the outer leaflet are the choline containing lipids.
62.

Which of the following vitamin is responsible for Ca^+2 and phosphate metabolism?(a) A(b) K(c) E(d) DThe question was posed to me in exam.I'm obligated to ask this question of Lipids as Signals, Cofactors, and Pigments in chapter Lipids, Biological Membranes and Transport of Biochemistry

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The correct ANSWER is (d) D

For EXPLANATION: Vitamin A –vision

Vitamin K-blood clotting

Vitamin E-prevention of OXIDATIVE damage.

63.

An example of glycerophospholipid involved in cell signaling is __________(a) Cardiolipin(b) Phosphatidic acid(c) Phosphatidylcholine(d) PhosphatidylinositolI had been asked this question in a job interview.I'd like to ask this question from Lipids as Signals, Cofactors, and Pigments in section Lipids, Biological Membranes and Transport of Biochemistry

Answer»

Right ANSWER is (d) PHOSPHATIDYLINOSITOL

Explanation: Phosphatidylinositol is involved in CELL SIGNALING.

64.

In which of the following glycerophospholipids two phosphatidic acids share single glycerol?(a) Cardiolipin(b) Phosphatidylserine(c) Phosphatidylinositol(d) PhosphatidylcholineThe question was posed to me in quiz.My doubt is from Structural Lipids in Membranes in section Lipids, Biological Membranes and Transport of Biochemistry

Answer»

The correct answer is (a) Cardiolipin

Explanation: In cardiolipin, TWO phosphatidic acids SHARE single GLYCEROL.

65.

Which of the following membrane lipids have a direct glycosidic linkage between the head-group sugar and the backbone glycerol?(a) Glycolipids(b) Phospholipids(c) Sphingolipids(d) Ether lipidsI got this question in an interview.Question is from Structural Lipids in Membranes topic in portion Lipids, Biological Membranes and Transport of Biochemistry

Answer»

The correct answer is (a) GLYCOLIPIDS

For explanation: Glycolipids have a DIRECT glycosidic LINKAGE between the head-group SUGAR and the backbone GLYCEROL.

66.

The dye used in TLC for detecting separated lipids by spraying the plate is __________(a) Mordant(b) Alizarin(c) Rhodamine(d) FuchsinThe question was posed to me by my college director while I was bunking the class.The query is from Working with Lipids topic in division Lipids, Biological Membranes and Transport of Biochemistry

Answer»

Correct answer is (c) RHODAMINE

The best I can explain: Rhodamine is the DYE used in TLC for DETECTING separated LIPIDS by spraying the PLATE.

67.

Which technique is preferred in the separation of fatty acyl methyl esters from a mixture?(a) Gas-liquid chromatography(b) Absorption chromatography(c) TLC(d) CentrifugationI got this question during an online exam.The origin of the question is Working with Lipids topic in division Lipids, Biological Membranes and Transport of Biochemistry

Answer»

The correct OPTION is (a) Gas-liquid chromatography

Explanation: Gas liquid chromatography or HPLC is preferred in the separation of fatty acyl methyl esters from a mixture.

68.

Which of the following hormone is responsible for the activation of phospholipase C?(a) Serotonin(b) Cortisol(c) Vasopressin(d) AdrenalineThe question was posed to me in an online interview.Origin of the question is Lipids as Signals, Cofactors, and Pigments in portion Lipids, Biological Membranes and Transport of Biochemistry

Answer» CORRECT option is (c) Vasopressin

Explanation: Vasopressin, when it binds to the PLASMA membrane receptors on the EPITHELIAL CELLS of the renal collecting duct, a specific PHOSPHOLIPASE C is activated.
69.

Phosphorylation of phosphatidylinositol yields __________(a) Phosphatidylinositol 4, 5-biphosphate(b) Phosphatidylinositol 3, 5-biphosphate(c) Phosphatidylinositol 3, 4-biphosphate(d) Phosphatidylinositol 5, 6-biphosphateThe question was posed to me during a job interview.This is a very interesting question from Lipids as Signals, Cofactors, and Pigments in portion Lipids, Biological Membranes and Transport of Biochemistry

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Right CHOICE is (a) PHOSPHATIDYLINOSITOL 4, 5-biphosphate

Explanation: Phosphorylation of phosphatidylinositol YIELDS phosphatidylinositol 4, 5-biphosphate.

70.

Which of the following fatty acid has 16 carbon atoms?(a) Linolenic acid(b) Oleic acid(c) Palmitic acid(d) Stearic acidThe question was posed to me in an international level competition.My query is from Storage Lipids in section Lipids, Biological Membranes and Transport of Biochemistry

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Correct CHOICE is (c) Palmitic acid

The EXPLANATION: Linolenic, OLEIC and stearic acids have 18 carbons.

71.

Which of the following glycerophospholid acts as a lipotropic agent?(a) Cardiolipin(b) Phosphatidylserine(c) Phosphatidylinositol(d) PhosphatidylcholineI had been asked this question in an online interview.My question is based upon Structural Lipids in Membranes topic in section Lipids, Biological Membranes and Transport of Biochemistry

Answer»

Right answer is (d) PHOSPHATIDYLCHOLINE

For EXPLANATION: Only phosphatidylcholine ACTS as a lipotropic AGENT.

72.

Which of the following is an essential fatty acid?(a) Linolenic(b) Palmitic(c) Oleic(d) StearicI have been asked this question in quiz.My question is taken from Storage Lipids in division Lipids, Biological Membranes and Transport of Biochemistry

Answer»

The CORRECT CHOICE is (a) Linolenic

Best explanation: Linoleic and alpha linolenic acids are the TWO ESSENTIAL FATTY acids.

73.

Movement of phospholipids from side to side is called ____________(a) Facilitated diffusion(b) Lateral diffusion(c) Transverse diffusion(d) Simple diffusionThe question was asked in final exam.This intriguing question comes from Membrane Dynamics in portion Lipids, Biological Membranes and Transport of Biochemistry

Answer» RIGHT choice is (b) LATERAL diffusion

Easy explanation: In lateral diffusion, movement of phospholipids from SIDE to side.