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.
| 101. |
When cross sectional area of the head group and acyl side chain is similar, which of the following lipid aggregates formation is favored? |
| A. | Micelles |
| B. | Bilayer |
| C. | Liposome |
| D. | Myelin sheath |
| Answer» C. Liposome | |
| 102. |
How many types of lipoproteins are there? |
| A. | 2 |
| B. | 6 |
| C. | 8 |
| D. | 5 |
| Answer» E. | |
| 103. |
Which of the following is false about lipids? |
| A. | They are either strongly hydrophobic or amphipathic |
| B. | They are more soluble in water |
| C. | Extraction of lipids from tissues require organic solvents |
| D. | They are insoluble in water |
| Answer» C. Extraction of lipids from tissues require organic solvents | |
| 104. |
Which of the following is one of the family of immunoglobin like proteins that mediate Ca⁺²? |
| A. | N-CAM |
| B. | Integrin |
| C. | Cadherin |
| D. | Selectin |
| Answer» B. Integrin | |
| 105. |
Which of the following is an essential fatty acid? |
| A. | Linolenic |
| B. | Palmitic |
| C. | Oleic |
| D. | Stearic |
| Answer» B. Palmitic | |
| 106. |
Pinocytosis occurs in |
| A. | all eukaryotic cells |
| B. | all prokaryotic cells |
| C. | mitochondria of all cells |
| D. | none of these |
| Answer» B. all prokaryotic cells | |
| 107. |
The movement of molecules across a membrane by passive transport does not require |
| A. | an input of metabolic energy |
| B. | internal energy |
| C. | vibrational energy |
| D. | none of these |
| Answer» B. internal energy | |
| 108. |
The key enzyme in the regulation of fatty acid synthesis is |
| A. | acetyl CoA carboxylase |
| B. | AMP activated proteinkinase |
| C. | protein phosphatase |
| D. | none of these |
| Answer» B. AMP activated proteinkinase | |
| 109. |
The lowest energy value lipid for human nutrition is |
| A. | olive oil |
| B. | olestra |
| C. | margarine |
| D. | cardiolipih |
| Answer» C. margarine | |
| 110. |
Biological steroid derived from cholesterol is |
| A. | Clenbuterol |
| B. | Cortisol |
| C. | Winstrol |
| D. | Dianabol |
| Answer» C. Winstrol | |
| 111. |
Synthesis of fatty acid takes place when |
| A. | fatty acid are plentiful |
| B. | carbohydrate is plentiful |
| C. | carbohydrate and energy are plentiful |
| D. | none of these |
| Answer» D. none of these | |
| 112. |
Fatty acids break down of eukaryotes occurs in |
| A. | mitochondrial matrix |
| B. | cell membrane |
| C. | cytosol |
| D. | endoplasmic reticulum |
| Answer» B. cell membrane | |
| 113. |
Which of the following is not found in membranes? |
| A. | Glycoproteins |
| B. | Glycolipids |
| C. | Nucleic acids |
| D. | Phospholipids |
| Answer» D. Phospholipids | |
| 114. |
Which of the following type structure contains all the three glycosphingolipids? |
| A. | B structure |
| B. | A structure |
| C. | O structure |
| D. | AB structure |
| Answer» D. AB structure | |
| 115. |
Which of the following membrane lipids have a direct glycosidic linkage between the head-group sugar and the backbone glycerol? |
| A. | Glycolipids |
| B. | Phospholipids |
| C. | Sphingolipids |
| D. | Ether lipids |
| Answer» B. Phospholipids | |
| 116. |
A platelet is able to play its role in the formation of blood clot when one of the glycerophospholipids in the plasma membrane moves into the outer leaflet. |
| A. | Phosphatidylserine |
| B. | Phosphatidylethanolamine |
| C. | Phosphatidylinositol |
| D. | Phosphatidylglycerol |
| Answer» B. Phosphatidylethanolamine | |
| 117. |
Out of the following, which is not an essential amino acid? |
| A. | Linolic acid |
| B. | Linolenic acid |
| C. | Arachidic acid |
| D. | Arachidonic acid |
| Answer» D. Arachidonic acid | |
| 118. |
Which of the following integral membrane protein is a special class of membrane rafts? |
| A. | Caveolin |
| B. | Integrin |
| C. | Cadherin |
| D. | Selectin |
| Answer» B. Integrin | |
| 119. |
Which of the following fatty acid has the least melting point? |
| A. | Palmitic acid |
| B. | Stearic acid |
| C. | Arachidonic acid |
| D. | Timnodonic acid |
| Answer» E. | |
| 120. |
Which of the following converts PGH₂ to thromboxane A₂? |
| A. | Enoyl-ACP reductase |
| B. | β-ketoacyl ACP reductase |
| C. | Cyclooxygenase |
| D. | Thromboxane synthase |
| Answer» E. | |
| 121. |
Conversion of acetyl co-A to malonyl co-A requires which of the following? |
| A. | NADPH |
| B. | H₂O |
| C. | Folic acid |
| D. | Biotin |
| Answer» E. | |
| 122. |
Movement of phospholipids to opposite sides is called ____________ |
| A. | Facilitated diffusion |
| B. | Lateral diffusion |
| C. | Transverse diffusion |
| D. | Simple diffusion |
| Answer» D. Simple diffusion | |
| 123. |
In which of the following glycerophospholipids two phosphatidic acids share single glycerol? |
| A. | Cardiolipin |
| B. | Phosphatidylserine |
| C. | Phosphatidylinositol |
| D. | Phosphatidylcholine |
| Answer» B. Phosphatidylserine | |
| 124. |
Which technique is preferred in the separation of fatty acyl methyl esters from a mixture? |
| A. | Gas-liquid chromatography |
| B. | Absorption chromatography |
| C. | TLC |
| D. | Centrifugation |
| Answer» B. Absorption chromatography | |
| 125. |
Semipermeable membrane allows ____________ |
| A. | Solute to pass |
| B. | Solution to pass |
| C. | Solvent to pass |
| D. | Proteins to pass |
| Answer» D. Proteins to pass | |
| 126. |
In eukaryotes fatty acid breakdown occurs in |
| A. | mitochondrial matrix |
| B. | cytosol |
| C. | cell membrane |
| D. | endoplasmic reticulum |
| Answer» B. cytosol | |
| 127. |
Exocytosis is the secretion of proteins |
| A. | out of the cell across the plasma membrane into the extracellular space |
| B. | out of the cell across the plasma membrane into the intracellular space |
| C. | is the uptake of macromolecules from the extracellular space into the cell across the plasma membrane |
| D. | is the uptake of macromolecules from the intracellular space into the cell across the plasma membrane |
| Answer» B. out of the cell across the plasma membrane into the intracellular space | |
| 128. |
Which of the following are the major component of chloroplast membrane of plants and are absent from animal cells? |
| A. | Glycolipids |
| B. | Phospholipids |
| C. | Ether lipids |
| D. | Triacylglycerols |
| Answer» B. Phospholipids | |
| 129. |
Bacteriorhodopsin |
| A. | absorbs light and pumps protons |
| B. | is an integral membrane protein |
| C. | contains primarily alpha-helical residues |
| D. | all of the above |
| Answer» E. | |
| 130. |
Where does triacylglycerol form? |
| A. | Liver |
| B. | Kidneys |
| C. | Adipose tissue |
| D. | Heart |
| Answer» B. Kidneys | |
| 131. |
Which of the following is the simplest hydrophilic moiety present in membrane lipids? |
| A. | Glucose |
| B. | Amino group |
| C. | Hydroxyl group |
| D. | Phosphate group |
| Answer» D. Phosphate group | |
| 132. |
VLDLs are synthesized in |
| A. | blood |
| B. | liver |
| C. | intestine |
| D. | pancreas |
| Answer» C. intestine | |
| 133. |
Membrane lipids are |
| A. | hydrophilic |
| B. | hydrophobic |
| C. | ampiphillic |
| D. | none of these |
| Answer» B. hydrophobic | |
| 134. |
Which of the following is an example of heterodimeric protein? |
| A. | Integrin |
| B. | Antibodies |
| C. | Receptor tyrosine kinase |
| D. | G-protein coupled receptor |
| Answer» B. Antibodies | |
| 135. |
Which of the following is choline containing lipid? |
| A. | Sphingomyelin |
| B. | Phosphatidylserine |
| C. | Phosphatidylglycerol |
| D. | Phosphatidylethanolamine |
| Answer» B. Phosphatidylserine | |
| 136. |
The lipids with potent bio activities derived from isoprenoid precursors are common in __________ |
| A. | Vitamin A, K, ubiquinone and dolichol |
| B. | Vitamin A, D, ubiquinone and dolichol |
| C. | Vitamin A, B, D and K |
| D. | Vitamin A, B, K and dolichol |
| Answer» B. Vitamin A, D, ubiquinone and dolichol | |
| 137. |
Which of the following glycerophospholipids is not common in inner leaflet (cytoplasmic)? |
| A. | Phosphatidylserine |
| B. | Phosphatidylethanolamine |
| C. | Phosphatidylinositol |
| D. | Phosphatidylcholine |
| Answer» E. | |
| 138. |
Which of the following glycerophospholid acts as a lipotropic agent? |
| A. | Cardiolipin |
| B. | Phosphatidylserine |
| C. | Phosphatidylinositol |
| D. | Phosphatidylcholine |
| Answer» E. | |
| 139. |
Chylomicrons are synthesized in |
| A. | blood |
| B. | liver |
| C. | intestine |
| D. | pancreas |
| Answer» D. pancreas | |
| 140. |
Which of the following serves as a specific binding site for the proteins involved in membrane fusion during exocytosis? |
| A. | Phosphatidylinositol |
| B. | Phosphatidylinositol 4, 5-biphosphate |
| C. | Phosphatidylinositol 3, 5-biphosphate |
| D. | Phosphatidylinositol 3, 4-biphosphate |
| Answer» C. Phosphatidylinositol 3, 5-biphosphate | |
| 141. |
Displacement of CMP through nucleophilic attack by the hydroxyl group of C-1 hydroxyl of glycerol 3-phosphate yields |
| A. | Phosphatidyl serine |
| B. | Phosphatidyl glycerol 3-phosphate |
| C. | Phosphatidyl glycerol |
| D. | Phosphatidylethanolamine |
| Answer» C. Phosphatidyl glycerol | |
| 142. |
Out of the following which is not a source of glycerol? |
| A. | Adipolysis |
| B. | Glycolysis |
| C. | Glycogenolysis |
| D. | Diet |
| Answer» D. Diet | |
| 143. |
Animals cannot convert fatty acids into glucose because |
| A. | acetyl CoA can not be converted to pyruvate |
| B. | absence of malate synthase |
| C. | absence of dehydrogenase |
| D. | absence of a-ketoglutarate dehydrogenase |
| Answer» B. absence of malate synthase | |
| 144. |
Phosphorylation of phosphatidylinositol yields __________ |
| A. | Phosphatidylinositol 4, 5-biphosphate |
| B. | Phosphatidylinositol 3, 5-biphosphate |
| C. | Phosphatidylinositol 3, 4-biphosphate |
| D. | Phosphatidylinositol 5, 6-biphosphate |
| Answer» B. Phosphatidylinositol 3, 5-biphosphate | |
| 145. |
Which of the following is a sphingophospholipid? |
| A. | Lecithin |
| B. | Sphingomyelin |
| C. | Plasmolegen |
| D. | Cardiolipin |
| Answer» C. Plasmolegen | |
| 146. |
Na⁺ glucose transporter is an example of ____________ |
| A. | Symport |
| B. | Antiport |
| C. | Facilitated diffusion |
| D. | ATP driven active transport |
| Answer» B. Antiport | |
| 147. |
Lysozymes are found in |
| A. | plant cells |
| B. | animal cells |
| C. | microbial cells |
| D. | all of these |
| Answer» B. animal cells | |
| 148. |
Biological membranes are like water beds because |
| A. | they are always moving |
| B. | they (normally) do not leak their contents |
| C. | the membrane is thin compared to the enclosed volume |
| D. | all of the above |
| Answer» E. | |
| 149. |
Which type of molecule spans the membrane, from its inner to outer surface according to the Fluid mosaic model of cell membranes? |
| A. | Cholesterol |
| B. | Phospholipid |
| C. | Protein |
| D. | Carbohydrate |
| Answer» D. Carbohydrate | |
| 150. |
The plasma membrane is a selectively permeable barrier due to presence of specific transport |
| A. | proteins |
| B. | amino acids |
| C. | carbohydrates |
| D. | none of these |
| Answer» B. amino acids | |