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.
| 101. |
Nitric acid (HNO₃) is used in manufacture of |
| A. | paints |
| B. | detergents |
| C. | dyes |
| D. | all of above |
| Answer» E. | |
| 102. |
A grown algae of bloom can be for others plant a blockage of |
| A. | light |
| B. | heat |
| C. | air |
| D. | water |
| Answer» B. heat | |
| 103. |
Some people believe that blue babies are born due to water containing |
| A. | nitrates |
| B. | oxygen |
| C. | nitrogen |
| D. | hydrogen |
| Answer» B. oxygen | |
| 104. |
As nitrogen oxides (NO, NO₂) are pollutants they cause |
| A. | acid rain only |
| B. | photochemical smog only |
| C. | lung cancer |
| D. | acid rain and photochemical smog |
| Answer» E. | |
| 105. |
Hydrogen is also obtained as a by-product of cracking of heavy fractions from |
| A. | coal |
| B. | crude oil |
| C. | petrol |
| D. | propane |
| Answer» C. petrol | |
| 106. |
The smoke released by car exhaust fumes are of |
| A. | nitrogen |
| B. | nitrates |
| C. | nitrogen oxides |
| D. | ammonia |
| Answer» D. ammonia | |
| 107. |
Nitrogen-based fertilizer formed from ammonia and nitric acid is |
| A. | Ammonium chloride |
| B. | ammonium nitrate |
| C. | ammonium sulfate |
| D. | ammonium carbonate |
| Answer» C. ammonium sulfate | |
| 108. |
Ammonium salts include |
| A. | Ammonium chloride |
| B. | ammonium nitrate |
| C. | ammonium sulfate |
| D. | all of above |
| Answer» E. | |
| 109. |
Which of the following is derived from tryptophan? |
| A. | Dopamine |
| B. | Norepinephrine |
| C. | Epinephrine |
| D. | Serotonin |
| Answer» E. | |
| 110. |
Which of the following catalyzes reactions that incorporate nitrogen derived from glutamine? |
| A. | Glutamine amidotransferase |
| B. | Adenylyltransferase |
| C. | Glutamate synthase |
| D. | Glutamine synthase |
| Answer» B. Adenylyltransferase | |
| 111. |
Cimetidine is a structural analog of |
| A. | Proline |
| B. | Tryptophan |
| C. | Tyrosine |
| D. | Histamine |
| Answer» E. | |
| 112. |
Which of the following gives rise to valine and isoleucine? |
| A. | Pyruvate |
| B. | Glutamate |
| C. | Aspartate |
| D. | Serine |
| Answer» B. Glutamate | |
| 113. |
Which of the following is the precursor for nitric oxide? |
| A. | Arginine |
| B. | Leucine |
| C. | Isoleucine |
| D. | Lysine |
| Answer» B. Leucine | |
| 114. |
What are the inputs to one cycle of urea cycle? |
| A. | One molecule of CO₂, one molecule of ammonia, three molecule of ATP and one molecule of aspartic 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» B. One molecule of urea, one molecule of AMP, two molecule of ADP and one molecule of fumaric acid | |
| 115. |
Fumarate is produced from four carbon atoms of |
| A. | Tyrosine |
| B. | Isoleucine |
| C. | Threonine |
| D. | Alanine |
| Answer» B. Isoleucine | |
| 116. |
In the first committed step of pyrimidine biosynthesis, the reaction is catalyzed by |
| A. | Adenylate kinase |
| B. | Aspartate transcarbamoylase |
| C. | Dihyhroorotase |
| D. | Cytidylate synthase |
| Answer» C. Dihyhroorotase | |
| 117. |
Which of the following can be formed by hydroxylation of phenylalanine? |
| A. | Serine |
| B. | Tyrosine |
| C. | Tryptophan |
| D. | Leucine |
| Answer» C. Tryptophan | |
| 118. |
How many carbons are present in HMG co-A? |
| A. | 2 |
| B. | 3 |
| C. | 5 |
| D. | 6 |
| Answer» E. | |
| 119. |
Ammonia gas is produced by heating ammonium salt with |
| A. | acid |
| B. | base |
| C. | alcohol |
| D. | water |
| Answer» C. alcohol | |
| 120. |
A ketogenic amino acid is one which degrades to |
| A. | keto-sugars |
| B. | either acetyl CoA or acetoacetyl CoA |
| C. | pyruvate or citric acid cycle intermediates |
| D. | multiple intermediates including pyruvate or citric acid cycle intermediates and acetyl CoA or acetoacetyl CoA |
| Answer» C. pyruvate or citric acid cycle intermediates | |
| 121. |
Marine animals die due to lack of oxygen in water which disturbs whole |
| A. | environment |
| B. | ecosystem |
| C. | biotic factors |
| D. | a-biotic factors |
| Answer» C. biotic factors | |
| 122. |
The essential intermediates in the pathway from acetate to cholesterol are |
| A. | Acetic acid |
| B. | Ethylene |
| C. | Isoprene units |
| D. | Methane |
| Answer» D. Methane | |
| 123. |
Which of the following amino acids are exclusively ketogenic? |
| A. | Leucine |
| B. | Asparagine |
| C. | Threonine |
| D. | Proline |
| Answer» B. Asparagine | |
| 124. |
Bacteria decompose dead plants and algae by increasing their growth rate and using |
| A. | dissolved oxygen |
| B. | carbon dioxide |
| C. | nitrogen |
| D. | nutrients |
| Answer» B. carbon dioxide | |
| 125. |
Explosive such as trinitrotoluene (TNT) is made by |
| A. | concentrated nitric acid |
| B. | ammonia |
| C. | nitrate |
| D. | ammonium nitrate |
| Answer» B. ammonia | |
| 126. |
A person with phenylketonuria cannot convert |
| A. | phenylalanine to tyrosine |
| B. | phenylalanine to isoleucine |
| C. | phenol into ketones |
| D. | phenylalanine to lysine |
| Answer» B. phenylalanine to isoleucine | |
| 127. |
The main catalyst which was used in Haber process was |
| A. | copper |
| B. | silver |
| C. | iron |
| D. | carbon |
| Answer» D. carbon | |
| 128. |
The most toxic compounds is |
| A. | tyrosine |
| B. | phenylpyruvate |
| C. | lysine |
| D. | phenylalanine |
| Answer» C. lysine | |
| 129. |
An example of a transamination process is |
| A. | glutamate = hexanoic acid + NH₃ |
| B. | aspartate + hexanoic acid = glutamate + oxaloacetate |
| C. | aspartate + α ketoglutarate = glutamate + oxaloacetate |
| D. | glutamate = α-ketoglutarate + NH₃ |
| Answer» D. glutamate = α-ketoglutarate + NH₃ | |
| 130. |
Transamination is the process where |
| A. | carboxyl group is transferred from amino acid |
| B. | α-amino group is removed from the amino acid |
| C. | polymerisation of amino acid takes place |
| D. | none of the above |
| Answer» C. polymerisation of amino acid takes place | |
| 131. |
A person with phenylketonuria is advised not to consume which of the following products? |
| A. | Glycine containing foods |
| B. | Fat containing food |
| C. | Glucose |
| D. | Aspartame |
| Answer» E. | |
| 132. |
Oxidative deamination is the conversion of an amino |
| A. | group from an amino acid to a keto acid |
| B. | acid to a carboxylic acid plus ammonia |
| C. | acid to a keto acid plus ammonia |
| D. | group from an amino acid to a carboxylic acid |
| Answer» D. group from an amino acid to a carboxylic acid | |