Set of Important MCQs on CHEMISTRY OF LIPIDS AND BIOMEMBRANES for the preparation of tests for chemistry and biology.Â
Which carries triglycerides with the highest proportion of saturated fatty acids?
- Sperm whale oil
- Butter
- Olive oil
- Beef fat
Question Answer: Beef fat
What feature of vitamin E is most responsible for its antioxidant activity?
- It is hydrophobic
- It has an aromatic ring
- It is associated with cell membranes
- It contains an isoprenoid side chain
Question Answer: It has an aromatic ring
Which would be most soluble in Benzene at 30°C?
- Stearic acid
- Myristic acid
- Palmitic acid
- Lauric acid
Question Answer: Lauric acid
How do non-steroidal anti-inflammatory drugs (NSAIDs), such as aspirin and steroid drugs reduce inflammation?
- They inhibit the action of prostaglandins
- They inhibit the activation of prostaglandins
- They block the formation of prostaglandins
- 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?
- Oedema
- Diabetes Mellitus
- Nephritis
- Atherosclerosis
Question Answer: Atherosclerosis
Which is different in A, 1B and H antigens?
- Phosphate residue
- Sugar residue
- Nucleotide residue
- Nitrogen residue
Question Answer: Sugar residue
Compared to olive oil, beef fat has a higher proportion of what?
- long-chain saturated fatty acids
- long chain unsaturated fatty acids
- Short-chain unsaturated fatty acids
- Short-chain saturated fatty acids
Question Answer: long-chain saturated fatty acids
Sphingolipids can contain all of the following, except
- Phosphocholine
- Sphingosine
- Glycerol
- A mono-or oligosaccharide
Question Answer: Glycerol
Phospholipases act on which type of lipids?
- Glycolipids
- Triacylglycerols
- Sphoingolipids
- Glycerophospholipids
Question Answer: Glycerophospholipids
Which statement is CORRECT about the difference between fats and sugars as a source of stored energy?
- Sugars yield more energy than fats
- Human body can store sugars much longer than fats
- Sugars are quicker source of energy because they are more soluble in
- 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?
- Five fused rings, four with six carbons and one with five.
- There fused rings, two with six carbons and one with five.
- Five fused rings, three with six carbons and two with five.
- 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 ______.
- Saponification
- Titration
- Rancidity
- None of these
Question Answer: Saponification
Rancidity of butter may be prevented by the addition of:
- Vitamin D
- Biotin
- Tocopherols
- Lead
Question Answer: Tocopherols
Which of the following are the esters of fatty acids with higher alcohols other than glycerol?
- Fats
- Waxes
- Both of these
- None of these
Question Answer: Waxes
The prostaglandins may be synthesized from which of the following?
- Linolenic acid
- Oleic acid
- Linoleic acid
- Arachidonic acid
Question Answer: Arachidonic acid
What is the fatty acid that must be obtained from the diet by humans?
- Oleic
- Linoleic
- Stearic
- Palmitoleic
Question Answer: Linoleic
Lieberman Burchard reaction is performed to detect which of the following?
- Fatty acids
- Glycerol
- Cholesterol
- Vitamin A
Question Answer: Cholesterol
How many double bonds are there in a molecule of Arachidonic Acid?
- 4
- 3
- 2
- 5
Question Answer: 4
Gangliosides are the glycolipids occurring in
- Liver
- Kidney
- Brain
- Muscle
Question Answer: Brain
Which is not a phospholipid?
- Lecithin
- Ganglioside
- Cephalin
- Plasminogen
Question Answer: Ganglioside
Which is correct for the properties of triacylglycerol?
- They are soluble in water
- They readily diffuse across cell membranes.
- They generate more energy than the same weight of carbohydrates
- All of these
Question Answer: They generate more energy than the same weight of carbohydrates
When lecithins are exposed to air, they turn.
- Brown
- Black
- Red
- Yellow
Question Answer: Brown
Which is NOT CORRECT about sterols?
- Sterols are structural lip in membranes
- Only eukaryotes can synthesize their own sterols.
- Cholesterol is a sterol.
- 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:
- Acid number
- Polanski number
- Halogenation
- Acetyl number
Question Answer: Polanski number
Which fatty acids would exhibit the lowest melting temperature?
- Oleic
- Linoleic
- Linolenic
- Stearic
Question Answer: Linolenic
Which is involved in carrying the messages to neighboring cells?
- Eicosanoids
B Glycolipids
- Phospholipids
- 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?
- Simple diffusion
- Active transport
- Facilitated diffusion
- All of these
Question Answer: Facilitated diffusion
Which one of following membranes has the highest content?
- Plasma membrane
- Inner mitochondrial membrane
- Myelin sheath
- Endoplasmic reticulum
Question Answer: Inner mitochondrial membrane
What is not correct regarding linoleic acid?
- It has 18 carbons
- It has 2 double bonds
- It is an essential fatty acid
- 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
- Pyridoxine
- Vitamin B
- Vitamin D.
- Inositol
Question Answer: Pyridoxine
Delta-9 indicates a double bond between carbon atoms of the fatty acids.
- 8 and 9
- 9 and 11
- 9 and 10
- All of these
Question Answer: 9 and 10
Which fatty acids in likely to be the most soluble in water?
- CH3(CH2)6 COOH
- CH3(CH2) COOH
- CH3(CH2)7CH=CH (CH2)7COOH
- All are insoluble in water
Question Answer: CH3(CH2)6 COOH
All sterols:
- Are synthesized in mitochondria
- Are alcohols
- Have linear structures
- Are derived from cholesterol
Question Answer: Are alcohols
In animal cells, where does fatty acid synthesis occur?
- In the endoplasmic reticulum
- In the cytosol
- In mitochondria
- In peroxisomes
Question Answer: In the cytosol
Ketosis is partly attributed to:
- Increased fat utilization
- Underproduction of glucose
- Increased carbohydrate utilization
- Overproduction of glucose
Question Answer: Increased fat utilization
What is the term associated with excretion of ketone bodies in urine?
- ketonuria
- Ketonemia
- Ketonosis
- Ketoacidosis
Question Answer: ketonuria
Which of the following can be termed as a Cyclooxygenase?
- Mixed function oxygenase
- Dioxygenase
- A suicide enzyme
- All of these
Question Answer: A suicide enzyme
The major proportion of absorbed fat appears in which form?
- HDL
- LDL
- VLDL
- Chylomicrons
Question Answer: Chylomicrons
Before the action of lipase, the fat is emulsified by which of the following?
- Phospholipids
- Lipoproteins
- Ergosterols
- Bicarbonate
Question Answer: Phospholipids
The most important source of reducing power, for fatty acid synthesis in hepatocytes is:
- Pentose phosphate pathway
- Oxidative decarboxylation of pyruvate
- Malic enzyme
- Citrate Lyase enzyme
Question Answer: Pentose phosphate pathway
The major function of HDL is to
- Deliver cholesterol form the liver to hepatic tissue
- Transfer cholesterol from peripheral tissue to the liver
- Transfer cholesterol from chylomicrons to VLDLS
- Catalyze the synthesis of ACAT
Question Answer: Transfer cholesterol from peripheral tissue to the liver
Which lipids is used for energy storage?
- Glycolipids
- Triacylglycerols
- Sphingolipids
- Glycerophosphates
Question Answer: Triacylglycerols
Which carbon number in stearic acid is the beta-carbon?
- C-3
- C-2
- C-18
- 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:
- y-Oxidation
- a-Oxidation
- 8-Oxidation
- All of these
Question Answer: 8-Oxidation
The reduction of Cholesterol by intestinal bacteria results in fecal excretion of
- Ergosterols
- Lanosterol
- Dolichol
- Coprosterol
Question Answer: Coprosterol
The “committed step” the biosynthesis of cholesterol is ____.
- Formation of acetoacetyl CoA from acetyl CoA
- Formation of mevalonate form HMG-CoA
- Formation of HMG-CoA
- Formation of squalene by synthase
Question Answer: Formation of mevalonate form HMG-CoA
Lipoprotein A may be associated with which of the following?
- Increased risk for atherosclerosis
- Prevention of lipid peroxidation
- Wound healing and cell repair
- All of these
Question Answer: Increased risk for atherosclerosis
Which is correct about fatty acid synthetize of vertebrates?
- It generates NADPH
- Its principal product is stearate
- It is a complex of seven polypeptides
- 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?
- Stearic acid
- Vitamin A
- Caproic acid
- Pantothenic acid
Question Answer: Pantothenic acid
More Biochemistry MCQs
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- Metabolism of Carbohydrates MCQs
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- Vitamins and Hormones MCQs
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