MCQs on Lipids and Biomembranes

By: Prof. Dr. Fazal Rehman | Last updated: February 3, 2024

Set of Important MCQs on CHEMISTRY OF LIPIDS AND BIOMEMBRANES for the preparation of tests for chemistry and biology. 

Which carries triglycerides with the highest proportion of saturated fatty acids?

  1. Sperm whale oil
  2. Butter
  3. Olive oil
  4. Beef fat

Question Answer: Beef fat

What feature of vitamin E is most responsible for its antioxidant activity?

  1. It is hydrophobic
  2. It has an aromatic ring
  3. It is associated with cell membranes
  4. It contains an isoprenoid side chain

Question Answer: It has an aromatic ring

Which would be most soluble in Benzene at 30°C?

  1. Stearic acid
  2. Myristic acid
  3. Palmitic acid
  4. Lauric acid

Question Answer: Lauric acid

How do non-steroidal anti-inflammatory drugs (NSAIDs), such as aspirin and steroid drugs reduce inflammation?

  1. They inhibit the action of prostaglandins
  2. They inhibit the activation of prostaglandins
  3. They block the formation of prostaglandins
  4. They inhibit the conversion of prostaglandins into molecules that cause inflammation

Question Answer: They block the formation of prostaglandins

The essential fatty acids are helpful in controlling Which?

  1. Oedema
  2. Diabetes Mellitus
  3. Nephritis
  4. Atherosclerosis

Question Answer: Atherosclerosis

Which is different in A, 1B and H antigens?

  1. Phosphate residue
  2. Sugar residue
  3. Nucleotide residue
  4. Nitrogen residue

Question Answer: Sugar residue

Compared to olive oil, beef fat has a higher proportion of what?

  1. long-chain saturated fatty acids
  2. long chain unsaturated fatty acids
  3. Short-chain unsaturated fatty acids
  4. Short-chain saturated fatty acids

Question Answer: long-chain saturated fatty acids

Sphingolipids can contain all of the following, except

  1. Phosphocholine
  2. Sphingosine
  3. Glycerol
  4. A mono-or oligosaccharide

Question Answer: Glycerol

Phospholipases act on which type of lipids?

  1. Glycolipids
  2. Triacylglycerols
  3. Sphoingolipids
  4. Glycerophospholipids

Question Answer: Glycerophospholipids

Which statement is CORRECT about the difference between fats and sugars as a source of stored energy?

  1. Sugars yield more energy than fats
  2. Human body can store sugars much longer than fats
  3. Sugars are quicker source of energy because they are more soluble in
  4. Fats are stored with more water than sugars

Question Answer: Sugars are quicker source of energy because they are more soluble in

The structure of the steroid nucleus consists of which of the following?

  1. Five fused rings, four with six carbons and one with five.
  2. There fused rings, two with six carbons and one with five.
  3. Five fused rings, three with six carbons and two with five.
  4. Four fused rings, three with six carbons and one with five.

Question Answer: Four fused rings, three with six carbons and one with five

Hydrolysis of fate by alkali is known as ______.

  1. Saponification
  2. Titration
  3. Rancidity
  4. None of these

Question Answer: Saponification

Rancidity of butter may be prevented by the addition of:

  1. Vitamin D
  2. Biotin
  3. Tocopherols
  4. Lead

Question Answer: Tocopherols

Which of the following are the esters of fatty acids with higher alcohols other than glycerol?

  1. Fats
  2. Waxes
  3. Both of these
  4. None of these

Question Answer: Waxes

The prostaglandins may be synthesized from which of the following?

  1. Linolenic acid
  2. Oleic acid
  3. Linoleic acid
  4. Arachidonic acid

Question Answer: Arachidonic acid

What is the fatty acid that must be obtained from the diet by humans?

  1. Oleic
  2. Linoleic
  3. Stearic
  4. Palmitoleic

Question Answer: Linoleic

Lieberman Burchard reaction is performed to detect which of the following?

  1. Fatty acids
  2. Glycerol
  3. Cholesterol
  4. Vitamin A

Question Answer: Cholesterol

How many double bonds are there in a molecule of Arachidonic Acid?

  1. 4
  2. 3
  3. 2
  4. 5

Question Answer: 4

Gangliosides are the glycolipids occurring in

  1. Liver
  2. Kidney
  3. Brain
  4. Muscle

Question Answer: Brain

Which is not a phospholipid?

  1. Lecithin
  2. Ganglioside
  3. Cephalin
  4. Plasminogen

Question Answer: Ganglioside

Which is correct for the properties of triacylglycerol?

  1. They are soluble in water
  2. They readily diffuse across cell membranes.
  3. They generate more energy than the same weight of carbohydrates
  4. All of these

Question Answer: They generate more energy than the same weight of carbohydrates

When lecithins are exposed to air, they turn.

  1. Brown
  2. Black
  3. Red
  4. Yellow

Question Answer: Brown

Which is NOT CORRECT about sterols?

  1. Sterols are structural lip in membranes
  2. Only eukaryotes can synthesize their own sterols.
  3. Cholesterol is a sterol.
  4. The fat-soluble vitamins are sterols

Question Answer: The fat-soluble vitamins are sterols

The number of milliliters of 0.1 N KOH needed to neutralize the insoluble fatty acids in 5 grams of fat is called:

  1. Acid number
  2. Polanski number
  3. Halogenation
  4. Acetyl number

Question Answer: Polanski number

Which fatty acids would exhibit the lowest melting temperature?

  1. Oleic
  2. Linoleic
  3. Linolenic
  4. Stearic

Question Answer: Linolenic

Which is involved in carrying the messages to neighboring cells?

  1. Eicosanoids

B Glycolipids

  1. Phospholipids
  2. All of these

Question Answer: Eicosanoids

By what mechanism would a polar molecule move across a membrane if a perm ease is helping the transport?

  1. Simple diffusion
  2. Active transport
  3. Facilitated diffusion
  4. All of these

Question Answer: Facilitated diffusion

Which one of following membranes has the highest content?

  1. Plasma membrane
  2. Inner mitochondrial membrane
  3. Myelin sheath
  4. Endoplasmic reticulum

Question Answer: Inner mitochondrial membrane

What is not correct regarding linoleic acid?

  1. It has 18 carbons
  2. It has 2 double bonds
  3. It is an essential fatty acid
  4. The first double bond from Methyl end is 9 carbons away

Question Answer: The first double bond from Methyl end is 9 carbons away

High blood cholesterol level may be associated with the deficiency of

  1. Pyridoxine
  2. Vitamin B
  3. Vitamin D.
  4. Inositol

Question Answer: Pyridoxine

Delta-9 indicates a double bond between carbon atoms of the fatty acids.

  1. 8 and 9
  2. 9 and 11
  3. 9 and 10
  4. All of these

Question Answer: 9 and 10

Which fatty acids in likely to be the most soluble in water?

  1. CH3(CH2)6 COOH
  2. CH3(CH2) COOH
  3. CH3(CH2)7CH=CH (CH2)7COOH
  4. All are insoluble in water

Question Answer: CH3(CH2)6 COOH

All sterols:

  1. Are synthesized in mitochondria
  2. Are alcohols
  3. Have linear structures
  4. Are derived from cholesterol

Question Answer: Are alcohols

In animal cells, where does fatty acid synthesis occur?

  1. In the endoplasmic reticulum
  2. In the cytosol
  3. In mitochondria
  4. In peroxisomes

Question Answer: In the cytosol

Ketosis is partly attributed to:

  1. Increased fat utilization
  2. Underproduction of glucose
  3. Increased carbohydrate utilization
  4. Overproduction of glucose

Question Answer: Increased fat utilization

What is the term associated with excretion of ketone bodies in urine?

  1. ketonuria
  2. Ketonemia
  3. Ketonosis
  4. Ketoacidosis

Question Answer: ketonuria

Which of the following can be termed as a Cyclooxygenase?

  1. Mixed function oxygenase
  2. Dioxygenase
  3. A suicide enzyme
  4. All of these

Question Answer: A suicide enzyme

The major proportion of absorbed fat appears in which form?

  1. HDL
  2. LDL
  3. VLDL
  4. Chylomicrons

Question Answer: Chylomicrons

Before the action of lipase, the fat is emulsified by which of the following?

  1. Phospholipids
  2. Lipoproteins
  3. Ergosterols
  4. Bicarbonate

Question Answer: Phospholipids

The most important source of reducing power, for fatty acid synthesis in hepatocytes is:

  1. Pentose phosphate pathway
  2. Oxidative decarboxylation of pyruvate
  3. Malic enzyme
  4. Citrate Lyase enzyme

Question Answer: Pentose phosphate pathway

The major function of HDL is to

  1. Deliver cholesterol form the liver to hepatic tissue
  2. Transfer cholesterol from peripheral tissue to the liver
  3. Transfer cholesterol from chylomicrons to VLDLS
  4. Catalyze the synthesis of ACAT

Question Answer: Transfer cholesterol from peripheral tissue to the liver

Which lipids is used for energy storage?

  1. Glycolipids
  2. Triacylglycerols
  3. Sphingolipids
  4. Glycerophosphates

Question Answer: Triacylglycerols

Which carbon number in stearic acid is the beta-carbon?

  1. C-3
  2. C-2
  3. C-18
  4. C-4

Question Answer: C-3

The fatty acids containing even number and odd number of carbon atoms as well as the unsaturated fatty acids are oxidized by:

  1. y-Oxidation
  2. a-Oxidation
  3. 8-Oxidation
  4. All of these

Question Answer: 8-Oxidation

The reduction of Cholesterol by intestinal bacteria results in fecal excretion of

  1. Ergosterols
  2. Lanosterol
  3. Dolichol
  4. Coprosterol

Question Answer: Coprosterol

The “committed step” the biosynthesis of cholesterol is ____.

  1. Formation of acetoacetyl CoA from acetyl CoA
  2. Formation of mevalonate form HMG-CoA
  3. Formation of HMG-CoA
  4. Formation of squalene by synthase

Question Answer: Formation of mevalonate form HMG-CoA

Lipoprotein A may be associated with which of the following?

  1. Increased risk for atherosclerosis
  2. Prevention of lipid peroxidation
  3. Wound healing and cell repair
  4. All of these

Question Answer: Increased risk for atherosclerosis

Which is correct about fatty acid synthetize of vertebrates?

  1. It generates NADPH
  2. Its principal product is stearate
  3. It is a complex of seven polypeptides
  4. It has a flexible phosphopantetheine arm

Question Answer: It has a flexible phosphopantetheine arm

Fatty liver may be caused by the deficiency of which of the following?

  1. Stearic acid
  2. Vitamin A
  3. Caproic acid
  4. Pantothenic acid

Question Answer: Pantothenic acid

More Biochemistry MCQs

  1. Acid and Base MCQs
  2. Carbohydrate MCQs
  3. Proteins MCQs
  4. Lipids and Biomembranes MCQs
  5. Nucleic acids MCQs
  6. Metabolism of Carbohydrates MCQs
  7. Enzymes MCQs
  8. Vitamins and Hormones MCQs
  9. Bioenergetic MCQs
  10. Biotechnology MCQs
  11. Biotechnology MCQs 2
  12. Basic Biochemistry MCQs (important)
  13. CHEMISTRY MCQs From all subjects of  Chemistry

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