MCQOPTIONS
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MCQOPTIONS
This section includes 132 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
CTP is formed from UTP by the action of |
| A. | Adenylate kinase |
| B. | Aspartate transcarbamoylase |
| C. | Dihyhroorotase |
| D. | Cytidylate synthase |
| Answer» E. | |
| 52. |
Prenisolone and prednisone are chemically |
| A. | Steroids |
| B. | Glycerol derivatives |
| C. | Non-steroid anti-inflammatory drug |
| D. | Amino alcohols |
| Answer» B. Glycerol derivatives | |
| 53. |
A best described ketogenic amino acid is |
| A. | lysine |
| B. | tryptophan |
| C. | valine |
| D. | none of these |
| Answer» B. tryptophan | |
| 54. |
Which of the following is an important precursor in purine pathway? |
| A. | Glycine |
| B. | Aspartate |
| C. | Glutamine |
| D. | Leucine |
| Answer» B. Aspartate | |
| 55. |
Which of the following is the best described glucogenic amino acid? |
| A. | Lysine |
| B. | Tryptophan |
| C. | Valine |
| D. | None of these |
| Answer» D. None of these | |
| 56. |
The first intermediate with a complete purine ring is |
| A. | Inosinate |
| B. | Formate |
| C. | Aspartate |
| D. | Glycine |
| Answer» B. Formate | |
| 57. |
Nitrate is reduced and ultimately produces N₂ through a series of intermediate gaseous nitrogen oxide products is called as |
| A. | Nitrogen fixation |
| B. | Nitrification |
| C. | Denitrification |
| D. | Nitrogen assimilation |
| Answer» D. Nitrogen assimilation | |
| 58. |
An amino group donated by glutamine is attached at C-1 of PRPP, this results in |
| A. | 5-phosphoribosylamine |
| B. | 4-phosphoribosylamine |
| C. | 3-phosphoribosylamine |
| D. | 2-phosphoribosylamine |
| Answer» B. 4-phosphoribosylamine | |
| 59. |
Urea production occurs almost exclusively in |
| A. | Kidneys |
| B. | Liver |
| C. | Blood |
| D. | Urine |
| Answer» C. Blood | |
| 60. |
Which of the following hydrolyzes successive amino-terminal residues from short peptides? |
| A. | Aminopeptidase |
| B. | Enteropeptidase |
| C. | Glutamine synthase |
| D. | Glutamate dehydrogenase |
| Answer» B. Enteropeptidase | |
| 61. |
Uridylylation and deuridylylation of Pıı are brought about by a single enzyme |
| A. | Uridylyltransferase |
| B. | Adenylyltransferase |
| C. | Glutamate synthase |
| D. | Dinitrogenase |
| Answer» B. Adenylyltransferase | |
| 62. |
Which of the following is an important precursor in pyrimidine pathway? |
| A. | Glycine |
| B. | Aspartate |
| C. | Glutamine |
| D. | Leucine |
| Answer» C. Glutamine | |
| 63. |
Which of the following regulates female reproductive cycle? |
| A. | Progesterone |
| B. | Testosterone |
| C. | Estrogens |
| D. | Glucocorticoids |
| Answer» B. Testosterone | |
| 64. |
Precursor of glycine is |
| A. | Proline |
| B. | Glutamine |
| C. | Serine |
| D. | Glutamate |
| Answer» D. Glutamate | |
| 65. |
Dinitrogenase is a |
| A. | Monomer |
| B. | Dimer |
| C. | Trimer |
| D. | Tetramer |
| Answer» E. | |
| 66. |
Dinitrogenase reductase is a |
| A. | Monomer |
| B. | Dimer |
| C. | Trimer |
| D. | Tetramer |
| Answer» C. Trimer | |
| 67. |
Which of the following produce succinyl co-A? |
| A. | Leucine |
| B. | Isoleucine |
| C. | Arginine |
| D. | Alanine |
| Answer» C. Arginine | |
| 68. |
Ammonia or ammonium is oxidized to nitrite followed by the oxidation of nitrite to nitrate is called as |
| A. | Nitrogen fixation |
| B. | Nitrification |
| C. | Denitrification |
| D. | Nitrogen assimilation |
| Answer» C. Denitrification | |
| 69. |
Which of the following produce α-ketoglutarate? |
| A. | Leucine |
| B. | Threonine |
| C. | Methionine |
| D. | Proline |
| Answer» E. | |
| 70. |
Ammonia is very important |
| A. | compound of nitrogen |
| B. | alkaline gas |
| C. | NH₃ |
| D. | all of above |
| Answer» E. | |
| 71. |
To reduce pollutants from motor vehicles car exhaust systems are fitted with |
| A. | catalytic converters |
| B. | mud guards |
| C. | cylinders |
| D. | fuel converters |
| Answer» B. mud guards | |
| 72. |
Ammonium compounds constitute very importantly |
| A. | fertilizers |
| B. | plastic |
| C. | glass |
| D. | chemicals |
| Answer» B. plastic | |
| 73. |
An environmental hazard when fertilizers leached from the fields into rivers and lakes is termed as |
| A. | leaching |
| B. | eutrophication |
| C. | pollution |
| D. | none of above |
| Answer» C. pollution | |
| 74. |
Pyruvate is the precursor for |
| A. | Alanine |
| B. | Glutamate |
| C. | Serine |
| D. | Proline |
| Answer» B. Glutamate | |
| 75. |
The combined action of aminotransferase and glutamate dehydrogenase is referred as |
| A. | Oxidative deamination |
| B. | Transamination |
| C. | Reductive deamination |
| D. | Transdeamination |
| Answer» E. | |
| 76. |
Trypsinogen is converted to its active state by |
| A. | Enteropeptidase |
| B. | Glutaminase |
| C. | Glutamine synthase |
| D. | Glutamate dehydrogenase |
| Answer» B. Glutaminase | |
| 77. |
Which of the following operates at an important intersection of carbon and nitrogen metabolism? |
| A. | Amino transferases |
| B. | Glutaminase |
| C. | Glutamine synthase |
| D. | Glutamate dehydrogenase |
| Answer» E. | |
| 78. |
Which of the following is an important cellular reducing agent? |
| A. | Glutathione |
| B. | Glycine |
| C. | Arginine |
| D. | Porphirin |
| Answer» B. Glycine | |
| 79. |
Which of the following is the major point of regulation on the pathway to cholesterol? |
| A. | Thiolase |
| B. | HMG co-A synthase |
| C. | HMG co-A reductase |
| D. | Pyruvate kinase |
| Answer» D. Pyruvate kinase | |
| 80. |
Products of urea cycle are |
| A. | One molecule of urea, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid |
| B. | One molecule of urea, one molecule of AMP, two molecule of ADP and one molecule of fumaric acid |
| C. | One molecule of aspartic acid, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid |
| D. | Two molecules of urea, two molecules of ammonia, one molecule of ATP and one molecule of fumaric acid |
| Answer» C. One molecule of aspartic acid, one molecule of ammonia, one molecule of ATP and one molecule of fumaric acid | |
| 81. |
Phosphoribosyl pyrophosphate is a precursor of tryptophan and |
| A. | Tyrosine |
| B. | Histidine |
| C. | Phenylalanine |
| D. | Isoleucine |
| Answer» C. Phenylalanine | |
| 82. |
Adenosine deaminase deaminates adenosine to |
| A. | Hypoxanthine |
| B. | Inosine |
| C. | Xanthine |
| D. | Guanosine |
| Answer» C. Xanthine | |
| 83. |
Which of the following amino acids is considered as both ketogenic and glucogenic? |
| A. | Valine |
| B. | Tryptophan |
| C. | Lysine |
| D. | None of these |
| Answer» C. Lysine | |
| 84. |
Production of Ammonia is |
| A. | endothermic |
| B. | exothermic |
| C. | ectothermic |
| D. | hypothermic |
| Answer» C. ectothermic | |
| 85. |
A glucogenic amino acid is one which is degraded to |
| A. | keto-sugars |
| B. | either acetyl CoA or acetoacetyl CoA |
| C. | pyruvate or citric acid cycle intermediates |
| D. | none of the above |
| Answer» D. none of the above | |
| 86. |
The only condition for nitrogen-based fertilizers is that they must be soluble in |
| A. | acid |
| B. | base |
| C. | water |
| D. | alkalis |
| Answer» D. alkalis | |
| 87. |
Lysine is degraded to acetoacetyl CoA and is described as a |
| A. | ketogenic amino acid |
| B. | glucogenic amino acid |
| C. | keto-gluco amino acid |
| D. | none of these |
| Answer» B. glucogenic amino acid | |
| 88. |
In extreme weather, oxygen reacts with nitrogen to form |
| A. | nitrogen (II) oxide only |
| B. | nitrogen (IV) oxide only |
| C. | nitrogen (III) oxide |
| D. | nitrogen (II) and nitrogen (IV) oxide |
| Answer» E. | |
| 89. |
During the production of ammonia low temperature is required. The advantages of low temperatures could be |
| A. | slow only |
| B. | better yields only |
| C. | better quality |
| D. | slow and better yields |
| Answer» E. | |
| 90. |
The Factories which produce fertilizers usually have plants of |
| A. | ammonia production |
| B. | nitric acid production |
| C. | ammonium nitrate production |
| D. | all of above |
| Answer» E. | |
| 91. |
The natural gas and steam react together in Haber's process to form |
| A. | oxygen |
| B. | nitrogen |
| C. | carbon dioxide |
| D. | hydrogen |
| Answer» E. | |
| 92. |
The cost of apparatus which can withstand high pressures above 30,000 kPa is extremely |
| A. | low |
| B. | high |
| C. | efficient |
| D. | not possible |
| Answer» C. efficient | |
| 93. |
The production of a large quantity of ammonia is done by increasing |
| A. | pressure |
| B. | temperature |
| C. | catalyst |
| D. | humidity |
| Answer» B. temperature | |
| 94. |
On a large scale, ammonia is produced at an industrial level through |
| A. | Haber process |
| B. | Contact process |
| C. | Nucleophilic reactions |
| D. | Electrophilic reactions |
| Answer» B. Contact process | |
| 95. |
The last stage of production of ammonia is condensed and collected in state of |
| A. | solid |
| B. | liquid |
| C. | gas |
| D. | vapor |
| Answer» C. gas | |
| 96. |
Tyrosine is degraded to acetoacetyl CoA and fumarate and is described as a |
| A. | glucogenic amino acid |
| B. | ketogenic amino acid |
| C. | ketogenic and glucogenic amino acid |
| D. | keto-gluco amino acid |
| Answer» D. keto-gluco amino acid | |
| 97. |
Transaminase enzymes are present in |
| A. | liver |
| B. | pancreas |
| C. | intestine |
| D. | none of these |
| Answer» B. pancreas | |
| 98. |
A person with phenylketonuria will convert |
| A. | phenylalanine to phenylpyruvate |
| B. | phenylalanine to isoleucine |
| C. | phenylpyruvate to phenylalanine |
| D. | tyrosine to phenylalanine |
| Answer» B. phenylalanine to isoleucine | |
| 99. |
In the normal breakdown of phenylalanine, it is initially degraded to |
| A. | fumarate |
| B. | tyrosine |
| C. | lysine |
| D. | phenylpuruvate |
| Answer» C. lysine | |
| 100. |
An example of the oxidative deamination is |
| A. | glutamate = hexanoic acid + NH₃ |
| B. | aspartate + α-ketoglutarate = glutamate + oxaloacetate |
| C. | glutamate = α-ketoglutarate + NH₃ |
| D. | aspartate + hexanoic acid = glutamate + Oxaloacetate |
| Answer» D. aspartate + hexanoic acid = glutamate + Oxaloacetate | |