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.
| 1. |
Which of the following acts as a passive electrical insulator? |
| A. | Myelin sheath |
| B. | Plasma membrane |
| C. | Inner mitochondrial membrane |
| D. | Outer mitochondrial membrane |
| Answer» B. Plasma membrane | |
| 2. |
Which of the following removes H₂O from β-hydroxyl ACP, creating double bond? |
| A. | β-ketoacyl ACP reductase |
| B. | β-hydroxyacyl ACP dehydratase |
| C. | Enoyl ACP reductase |
| D. | Malonyl co-A ACP transferase |
| Answer» C. Enoyl ACP reductase | |
| 3. |
Movement of phospholipids from side to side is called ____________ |
| A. | Facilitated diffusion |
| B. | Lateral diffusion |
| C. | Transverse diffusion |
| D. | Simple diffusion |
| Answer» C. Transverse diffusion | |
| 4. |
Which of the following is not true regarding synthesis of triacyl glycerol in adipose tissue? |
| A. | Phosphatidate is hydrolyzed |
| B. | Glycerol 3-phosphate dehydrogenase plays an important role |
| C. | Glycerol kinase plays an important role |
| D. | It is synthesized from dihydroxyacetone phosphate |
| Answer» D. It is synthesized from dihydroxyacetone phosphate | |
| 5. |
Which of the following phospholipids is a component of inner mitochondrial membrane? |
| A. | Plasmologen |
| B. | Cephalin |
| C. | Lecithin |
| D. | Cardiolipin |
| Answer» E. | |
| 6. |
Which of the following is involved in the bio-signaling pathway that includes membrane turnover and exocytosis? |
| A. | Phosphatidylinositol |
| B. | Phosphatidyl glycerol |
| C. | Myoinositol |
| D. | Phosphatidyl glycerol and myoinositol |
| Answer» B. Phosphatidyl glycerol | |
| 7. |
Which of the following proteins does not function in cell-cell interaction? |
| A. | Integrin |
| B. | Cadherin |
| C. | N-CAM |
| D. | Cytochrome c |
| Answer» E. | |
| 8. |
Platelet activating factor stimulates the release of which of the following compounds? |
| A. | Vasopressin |
| B. | Serotonin |
| C. | Adrenaline |
| D. | Cortisol |
| Answer» C. Adrenaline | |
| 9. |
Plasma membrane is permeable to __________ |
| A. | ATP |
| B. | Glucose |
| C. | K⁺ |
| D. | Urea |
| Answer» E. | |
| 10. |
A mixture of fatty acyl methyl esters are separated based on __________ |
| A. | Charge |
| B. | Chain length and degree of saturation |
| C. | Molecular weight |
| D. | Ionic size |
| Answer» C. Molecular weight | |
| 11. |
Displacement of CMP through nucleophilic attack by the hydroxyl group of serine yields |
| A. | Phosphatidyl serine |
| B. | Phosphatidyl glycerol 3-phosphate |
| C. | Phosphatidyl glycerol |
| D. | Phosphatidylethanolamine |
| Answer» B. Phosphatidyl glycerol 3-phosphate | |
| 12. |
Which of the following is a storage form of lipid? |
| A. | Glycolipid |
| B. | Phospholipid |
| C. | Sufolipid |
| D. | Triacyl glycerol |
| Answer» E. | |
| 13. |
Which of the following is considered as the structural parent of all sphingolipids? |
| A. | Sphingosine |
| B. | Ceramide |
| C. | Lecithin |
| D. | Sphyngomylein |
| Answer» C. Lecithin | |
| 14. |
In which type of chromatography, solvents of increasing polarity are passed through a column of silica gel? |
| A. | High performance liquid chromatography |
| B. | Thin layer chromatography |
| C. | Adsorption chromatography |
| D. | Gas-liquid chromatography |
| Answer» D. Gas-liquid chromatography | |
| 15. |
Dihydroxyacetone phosphate precursor of glycerol 3-phosphate is derived from |
| A. | Glycerol |
| B. | Triacylglycerol |
| C. | Glycerol 3-phosphate |
| D. | Pyruvate |
| Answer» E. | |
| 16. |
Out of the following, cholesterol does not serve as a precursor for which compounds? |
| A. | Vitamin D |
| B. | Sex hormones |
| C. | Bile salts |
| D. | Bile pigments |
| Answer» E. | |
| 17. |
Which of the following group of membrane lipids predominate in plant cells? |
| A. | Galactolipids |
| B. | Sphingolipids |
| C. | Glycerophospholipids |
| D. | Archaebacterial ether lipids |
| Answer» B. Sphingolipids | |
| 18. |
When does saturation occur? |
| A. | When molecules are moved by the use of vesicles |
| B. | When the energy from a high-energy bond is required to move molecules |
| C. | When a group of carrier proteins is operating at its maximum rate |
| D. | When a carrier molecule has the ability to transport only one molecule or a group of closely related molecules |
| Answer» D. When a carrier molecule has the ability to transport only one molecule or a group of closely related molecules | |
| 19. |
Erythrocyte glucose transporter is an example of ____________ |
| A. | Ion driven active transport |
| B. | Facilitated diffusion |
| C. | Active transport |
| D. | Simple diffusion |
| Answer» C. Active transport | |
| 20. |
The higher activity of which of the following enzymes leads to increased synthesis of the precursors of glyceroneogenesis |
| A. | PEP carboxykinase |
| B. | Acyl transferase |
| C. | Acyl co-A synthase |
| D. | Phosphatidic acid phosphatase |
| Answer» B. Acyl transferase | |
| 21. |
Which of the following condenses acyl and malonyl groups? |
| A. | Acyl carrier protein |
| B. | Acetyl co-A ACP transacetylase |
| C. | β-ketoacyl ACP synthase |
| D. | Malonyl co-A ACP transferase |
| Answer» D. Malonyl co-A ACP transferase | |
| 22. |
The number of milligrams of KOH required to neutralize the free and combined fatty acid in one gram of a given fat is called __________ |
| A. | Saponification number |
| B. | Iodine number |
| C. | Acid number |
| D. | Polenske number |
| Answer» B. Iodine number | |
| 23. |
Which of the following reduces β-keto group to β-hydroxyl group? |
| A. | β-ketoacyl ACP reductase |
| B. | β-hydroxyacyl ACP dehydratase |
| C. | Enoyl ACP reductase |
| D. | Malonyl co-A ACP transferase |
| Answer» B. β-hydroxyacyl ACP dehydratase | |
| 24. |
Which out of the following is not mediated transport? |
| A. | Facilitated diffusion |
| B. | Primary active transport |
| C. | Secondary active transport |
| D. | Simple diffusion |
| Answer» E. | |
| 25. |
The most complex sphingolipid is |
| A. | Cerebroside |
| B. | Gangleoside |
| C. | Globoside |
| D. | Ceramide |
| Answer» C. Globoside | |
| 26. |
Which of the following is not a phospholipase? |
| A. | A |
| B. | C |
| C. | D |
| D. | K |
| Answer» E. | |
| 27. |
Which of the following transports only one kind of substrate? |
| A. | Uniport carriers |
| B. | Symport carriers |
| C. | Antiport carriers |
| D. | Membrane proteins |
| Answer» B. Symport carriers | |
| 28. |
For the determination of fatty acid composition, transesterification is done in a warm aqueous solution of __________ |
| A. | KCl+methanol |
| B. | KOH+methanol |
| C. | NaOH+methanol |
| D. | H₂O+methanol |
| Answer» D. H₂O+methanol | |
| 29. |
What leads to the activation of protein kinase C? |
| A. | Release of intracellular Ca⁺² + diacylglycerol |
| B. | Release of intracellular Mg⁺ + diacylglycerol |
| C. | Release of intracellular Ca⁺² + glycerol |
| D. | Release of intracellular Ca⁺² + triacylglycerol |
| Answer» B. Release of intracellular Mg⁺ + diacylglycerol | |
| 30. |
When cross sectional area of the head group is greater than that of the acyl side chain, which of the following lipid aggregates formation is favored? |
| A. | Micelles |
| B. | Bilayer |
| C. | Liposome |
| D. | Myelin sheath |
| Answer» B. Bilayer | |
| 31. |
Which of the following transfers malonyl group from co-A to ACP? |
| A. | Acyl carrier protein |
| B. | Acetyl co-A ACP transacetylase |
| C. | Enoyl-ACP reductase |
| D. | Malonyl co-A ACP transferase |
| Answer» E. | |
| 32. |
In which type of chromatography lipids are carried up a silica gel coated pate by a rising solvent front, less polar travels farther than the more polar ones? |
| A. | Absorption chromatography |
| B. | Thin layer chromatography |
| C. | Gas-liquid chromatography |
| D. | HPLC |
| Answer» C. Gas-liquid chromatography | |
| 33. |
In which of the following means of transport a cell expels large molecules out of it? |
| A. | Phagocytosis |
| B. | Exocytosis |
| C. | Endocytosis |
| D. | Diffusion |
| Answer» C. Endocytosis | |
| 34. |
What is the head-group alcohol in plasmolegen and platelet-activating factor? |
| A. | Alkene |
| B. | Choline |
| C. | Alkane |
| D. | Acetic acid |
| Answer» C. Alkane | |
| 35. |
Which of the following vitamin is responsible for Ca⁺² and phosphate metabolism? |
| A. | A |
| B. | K |
| C. | E |
| D. | D |
| Answer» E. | |
| 36. |
Which of the following is energy independent? |
| A. | Active transport |
| B. | Primary active transport |
| C. | Secondary active transport |
| D. | Passive transport |
| Answer» E. | |
| 37. |
Which of the following has high lipid content? |
| A. | Myelin sheath |
| B. | Plasma membrane |
| C. | Inner mitochondrial membrane |
| D. | Outer mitochondrial membrane |
| Answer» B. Plasma membrane | |
| 38. |
Which of the following vitamin is derived from cholesterol? |
| A. | A |
| B. | B |
| C. | C |
| D. | D |
| Answer» E. | |
| 39. |
Which of the following is more commonly called phosphatidic acid? |
| A. | Diacylglycerol 3-phosphate |
| B. | Fatty acyl co-A |
| C. | L-glycerol 3-phosphate |
| D. | L-glycerol 2-phosphate |
| Answer» B. Fatty acyl co-A | |
| 40. |
Which of the following carries acyl groups in thio-ester linkage? |
| A. | Acyl carrier protein |
| B. | Acetyl co-A ACP transacetylase |
| C. | Enoyl-ACP reductase |
| D. | Malonyl co-A ACP transferase |
| Answer» B. Acetyl co-A ACP transacetylase | |
| 41. |
Which of the following hormone is responsible for the activation of phospholipase C? |
| A. | Serotonin |
| B. | Cortisol |
| C. | Vasopressin |
| D. | Adrenaline |
| Answer» D. Adrenaline | |
| 42. |
Molecular formula of cholesterol is |
| A. | C₂₇H₄₅OH |
| B. | C₂₈H₄₅OH |
| C. | C₂₉H₄₅OH |
| D. | C₂₃H₄₅OH |
| Answer» B. C₂₈H₄₅OH | |
| 43. |
How many classes of steroid hormones are there? |
| A. | 3 |
| B. | 2 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 44. |
The number of water molecules consumed by the formation of phosphatidyl serine are |
| A. | 0 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| Answer» B. 1 | |
| 45. |
The model that is now known to be correct for the structure of biological membrane is |
| A. | Fluid mosaic model |
| B. | Page's model |
| C. | Lac Operon model |
| D. | Lock and Key model |
| Answer» B. Page's model | |
| 46. |
Which of the following is called milk ejection hormone? |
| A. | Prolactin |
| B. | Vasopressin |
| C. | Oxytocin |
| D. | All of these |
| Answer» D. All of these | |
| 47. |
Cholestrol is the precursor of |
| A. | steroid hormones |
| B. | vitamin A |
| C. | bile salts |
| D. | both (a) and (c) |
| Answer» E. | |
| 48. |
Fatty acid synthesis takes place in |
| A. | mitochondria |
| B. | cell membrane |
| C. | cytosol |
| D. | endoplasmic reticulum |
| Answer» D. endoplasmic reticulum | |
| 49. |
The membrane proteins that catalyze active transport reactions differ from soluble enzymes as |
| A. | they are permanently changed during the reaction |
| B. | the substrates of the reaction are all outside the cell |
| C. | they do not enhance the rates of reaction |
| D. | the products of the reaction move in a specific direction |
| Answer» E. | |
| 50. |
Peptidoglycan is a complex consisting of |
| A. | oligo-saccharide and protein |
| B. | polysaccharide and protein |
| C. | mono-saccharide and protein |
| D. | aminoacid and carbohydrate |
| Answer» B. polysaccharide and protein | |