MCQOPTIONS
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MCQOPTIONS
This section includes 150 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
The mesosomes may be the sites of |
| A. | DNA replication and specialized enzymatic reactions |
| B. | RNA replications and specialized enzymatic reactions |
| C. | RNA replications and specialized cyclic reactions |
| D. | None of the above |
| Answer» B. RNA replications and specialized enzymatic reactions | |
| 52. |
In active transport, the membrane structure that functions is |
| A. | cholesterol |
| B. | integral proteins |
| C. | carbohydrates |
| D. | hydrophobic molecules |
| Answer» C. carbohydrates | |
| 53. |
What is the major protein constituent of high-density lipoprotein (HDL)? |
| A. | Apolipoprotein A-l |
| B. | Apolipoprotein C-l |
| C. | Apolipoprotein E |
| D. | None of these |
| Answer» B. Apolipoprotein C-l | |
| 54. |
How many ATPs are formed during complete oxidation of palmitate? |
| A. | 35 |
| B. | 96 |
| C. | 129 |
| D. | 131 |
| Answer» D. 131 | |
| 55. |
Palmitate has 16 carbon atoms with |
| A. | 2 double bonds |
| B. | 3 double bonds |
| C. | One double bond |
| D. | None of these |
| Answer» E. | |
| 56. |
HDLs are synthesized in |
| A. | blood |
| B. | liver |
| C. | intestine |
| D. | pancreas |
| Answer» C. intestine | |
| 57. |
Triacylglycerols are |
| A. | soluble in water |
| B. | insoluble in water |
| C. | soluble in water at elevated temperature |
| D. | partially soluble in water |
| Answer» C. soluble in water at elevated temperature | |
| 58. |
Cholesterolemia means |
| A. | lack of functional LDL receptors |
| B. | lack of functional HDL receptor |
| C. | high sensitivity to fatty food intake |
| D. | none of the above |
| Answer» B. lack of functional HDL receptor | |
| 59. |
In Fluid mosaic model, the biological membrane can be viewed as |
| A. | two dimensional solutions of oriented lipids and globular proteins |
| B. | three dimensional solutions of oriented lipids and globular proteins |
| C. | two dimensional solutions of oriented lipids and carbohydrate |
| D. | three dimensional solutions of oriented lipids and carbohydrate |
| Answer» B. three dimensional solutions of oriented lipids and globular proteins | |
| 60. |
Micelles of fatty acids in water are organized such that the __________ faces the solvent and the __________ are directed toward the interior |
| A. | carboxylic acid groups, hydrocarbon chains heads |
| B. | hydrophilic heads, hydrophobic tails |
| C. | hydrocarbon chains, carboxylic acid groups |
| D. | both (a) and (b) |
| Answer» E. | |
| 61. |
Arachidonate has 20 carbon atoms with |
| A. | 3 double bonds |
| B. | 2 double bonds |
| C. | 4 double bonds |
| D. | 8 double bonds |
| Answer» D. 8 double bonds | |
| 62. |
Which of the following class of drugs reduce the levels of fatty acids circulating in the blood? |
| A. | Thiazolidinediones |
| B. | Amphetamines |
| C. | Cathinones |
| D. | Synthetic cannabinoids |
| Answer» B. Amphetamines | |
| 63. |
Which of the following membranes contain low cholesterol and high cardiolipin? |
| A. | Myelin sheath |
| B. | Plasma membrane |
| C. | Inner mitochondrial membrane of hepatocyte |
| D. | Cell wall |
| Answer» D. Cell wall | |
| 64. |
Which would move faster in thin layer chromatography? |
| A. | Beeswax |
| B. | Phosphatidylinositol |
| C. | Cholesterol |
| D. | Steroid |
| Answer» B. Phosphatidylinositol | |
| 65. |
Which of the following is not one of the states of lipids? |
| A. | Para crystalline state |
| B. | Liquid ordered state |
| C. | Liquid disordered state |
| D. | Crystalline state |
| Answer» E. | |
| 66. |
Which of the following transfers acyl group from co-A to cys residue of KS? |
| A. | Acyl carrier protein |
| B. | Acetyl co-A ACP transacetylase |
| C. | Enoyl-ACP reductase |
| D. | Malonyl co-A ACP transferase |
| Answer» C. Enoyl-ACP reductase | |
| 67. |
Which of the following is important in signal transduction triggered by hormones? |
| A. | Phosphatidylinositol and its derivatives |
| B. | Phosphatidylserine and its derivatives |
| C. | Phosphatidylglycerol and its derivatives |
| D. | Phosphatidylethanolamine |
| Answer» B. Phosphatidylserine and its derivatives | |
| 68. |
Cholesterol is essential for normal membrane functions because it |
| A. | plugs up the cardiac arteries of older men |
| B. | cannot be made by higher organisms |
| C. | keeps membranes fluid. |
| D. | spans the thickness of the bilayer |
| Answer» D. spans the thickness of the bilayer | |
| 69. |
Which of the following is an example of peripheral membrane protein? |
| A. | Insulin receptor |
| B. | Glycophorin |
| C. | Integrin |
| D. | Glycolipid transfer proteins |
| Answer» E. | |
| 70. |
How many types of lipid aggregates are formed when amphipathic lipids are mixed with water? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 71. |
The prosthetic group of acyl carrier protein is |
| A. | 4’-phosphopantetheine |
| B. | 3’-phosphopantetheine |
| C. | 2’-phosphopantetheine |
| D. | 1’-phosphopantetheine |
| Answer» B. 3’-phosphopantetheine | |
| 72. |
Phosphatidylserine is derived only from |
| A. | Phosphatidylethanolamine |
| B. | Phosphatidyl glycerol |
| C. | Phosphatidyl choline |
| D. | CDP-diacylglycerol |
| Answer» B. Phosphatidyl glycerol | |
| 73. |
Cerebroside is also called as |
| A. | Sphingomyelin |
| B. | N-acylsphingosine |
| C. | Sphinganine |
| D. | Gangliosides |
| Answer» B. N-acylsphingosine | |
| 74. |
In the intestine, the dietary fats are hydrolysed by |
| A. | triacylglycerol lipase |
| B. | adenylate cyclase |
| C. | pancreatic lipase |
| D. | protein kinase |
| Answer» D. protein kinase | |
| 75. |
How are the intrinsic proteins in cell membrane distributed? |
| A. | Uniform |
| B. | Random |
| C. | Symmetric |
| D. | Asymmetric |
| Answer» E. | |
| 76. |
Which of the following reduces double bond, forming saturated acyl ACP? |
| A. | β-ketoacyl ACP reductase |
| B. | β-hydroxyacyl ACP dehydratase |
| C. | Enoyl ACP reductase |
| D. | Malonyl co-A ACP transferase |
| Answer» D. Malonyl co-A ACP transferase | |
| 77. |
In membranes, lipids are |
| A. | glycerophospholipids |
| B. | sphingolipids |
| C. | sterols |
| D. | all of these |
| Answer» E. | |
| 78. |
Cholesterol is somewhat amphipathic due to |
| A. | the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule |
| B. | the long branched hydrocarbon along with the four hydrocarbon rings |
| C. | the five-methyl groups along with the hydrocarbon chain |
| D. | the three six-membered rings along with the single five-membered ring |
| Answer» B. the long branched hydrocarbon along with the four hydrocarbon rings | |
| 79. |
In adipose tissue, glyceroneogenesis couples with |
| A. | Reesterification |
| B. | Esterification |
| C. | Glycolysis |
| D. | Phosphorylation |
| Answer» B. Esterification | |
| 80. |
How many products are obtained by the hydrolysis of phosphatidylinositol by phospholipase C? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 81. |
Which of the following induces conformational change in protein? |
| A. | Uniport |
| B. | Symport |
| C. | Antiport |
| D. | Facilitated diffusion |
| Answer» E. | |
| 82. |
Which of the following arrangement based on the increasing order of motion is correct? |
| A. | Uncatalysed transverse motion, transverse diffusion catalyzed by flippase, uncatalysed lateral diffusion |
| B. | Uncatalysed lateral diffusion, uncatalysed transverse motion, transverse diffusion catalyzed by flippase |
| C. | Uncatalysed transverse motion, uncatalysed lateral diffusion, transverse diffusion catalyzed by flippase |
| D. | Transverse diffusion catalyzed by flippase, uncatalysed lateral diffusion, uncatalysed transverse motion |
| Answer» B. Uncatalysed lateral diffusion, uncatalysed transverse motion, transverse diffusion catalyzed by flippase | |
| 83. |
In animal tissues, triacylglycerols and glycerophospholipids share two precursors |
| A. | Fatty acyl co-A and L-glycerol 3-phosphate |
| B. | L-glycerol 3-phosphate and L-glycerol 2-phosphate |
| C. | Diacylglycerol 3-phosphate and L-glycerol 3-phosphate |
| D. | L-glycerol 3-phosphate and diacylglycerol 2-phosphate |
| Answer» B. L-glycerol 3-phosphate and L-glycerol 2-phosphate | |
| 84. |
Hydrolysis of phosphatidic acid by phosphatidic acid phosphatase yields |
| A. | 1, 2-diacylglycerol |
| B. | 1, 3-diacylglycerol |
| C. | 1, 4-diacylglycerol |
| D. | 1, 5-diacylglycerol |
| Answer» B. 1, 3-diacylglycerol | |
| 85. |
Trans bilayer diffusion is also called ____________ |
| A. | Facilitated diffusion |
| B. | Lateral diffusion |
| C. | Flip flop |
| D. | Simple diffusion |
| Answer» D. Simple diffusion | |
| 86. |
An example of glycerophospholipid involved in cell signaling is __________ |
| A. | Cardiolipin |
| B. | Phosphatidic acid |
| C. | Phosphatidylcholine |
| D. | Phosphatidylinositol |
| Answer» E. | |
| 87. |
Which of the following is false about fatty acids? |
| A. | Melting point of fatty acids decreases with increase in degree of saturation |
| B. | Lipids in tissues that are subjected to cooling are more unsaturated |
| C. | Naturally occurring unsaturated long-chain fatty acids are nearly Trans-configuration |
| D. | The membrane lipids contain mostly unsaturated fatty acids |
| Answer» D. The membrane lipids contain mostly unsaturated fatty acids | |
| 88. |
Which of the following does not contain glycerol? |
| A. | Glycerophospholipids |
| B. | Galactolipids |
| C. | Sphingolipids |
| D. | Triacylglycerols |
| Answer» D. Triacylglycerols | |
| 89. |
Which of the following is a polar derivative of cholesterol? |
| A. | Bile salt |
| B. | Oestrogen |
| C. | Vitamin D |
| D. | Progesterone |
| Answer» B. Oestrogen | |
| 90. |
Atherosclerosis can cause blood |
| A. | thinning |
| B. | clotting |
| C. | thickening |
| D. | none of these |
| Answer» C. thickening | |
| 91. |
Phospholipid contains |
| A. | hydrophilic heads and hydrophobic tails |
| B. | long water-soluble carbon chains |
| C. | positively charged functional groups |
| D. | both (b) and (c) |
| Answer» B. long water-soluble carbon chains | |
| 92. |
The smooth endoplasmic reticulum (SER) is the site of |
| A. | phospholipid synthesis |
| B. | amino acid synthesis |
| C. | carbohydrate synthesis |
| D. | protein synthesis |
| Answer» B. amino acid synthesis | |
| 93. |
The precursor of eicosanoids in human is |
| A. | Ceramide |
| B. | Arachidonic acid |
| C. | Cholesterol |
| D. | Squaline |
| Answer» C. Cholesterol | |
| 94. |
The dye used in TLC for detecting separated lipids by spraying the plate is __________ |
| A. | Mordant |
| B. | Alizarin |
| C. | Rhodamine |
| D. | Fuchsin |
| Answer» D. Fuchsin | |
| 95. |
Which of the following is a hydroxyl fatty acid? |
| A. | Linoleic acid |
| B. | Palmitic acid |
| C. | Linolenic acid |
| D. | Cerebronic acid |
| Answer» E. | |
| 96. |
Which of the following fatty acid has 16 carbon atoms? |
| A. | Linolenic acid |
| B. | Oleic acid |
| C. | Palmitic acid |
| D. | Stearic acid |
| Answer» D. Stearic acid | |
| 97. |
HCO₃⁻ – Cl⁻ transporter is an example of ____________ |
| A. | Uniport |
| B. | Antiport |
| C. | Symport |
| D. | Facilitated diffusion |
| Answer» C. Symport | |
| 98. |
The backbone of phospholipids is __________ |
| A. | L-glycerol 1-phosphate |
| B. | L-glycerol 3-phosphate |
| C. | D-glycerol 3-phosphate |
| D. | sn-glycerol 1-phosphate |
| Answer» C. D-glycerol 3-phosphate | |
| 99. |
Phosphatidylinositol, phosphatidylglycerol and phosphatidylserine are easily separated by __________ |
| A. | Absorption chromatography |
| B. | TLC |
| C. | HPLC |
| D. | Gas-liquid chromatography |
| Answer» C. HPLC | |
| 100. |
Which of the following types of lipid aggregates has maximum stability? |
| A. | Micelles |
| B. | Bilayer |
| C. | Liposome |
| D. | Myelin sheath |
| Answer» D. Myelin sheath | |