MCQOPTIONS
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MCQOPTIONS
This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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 | |
| 2. |
Membrane lipids are |
| A. | hydrophilic |
| B. | hydrophobic |
| C. | ampiphillic |
| D. | none of these |
| Answer» B. hydrophobic | |
| 3. |
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 | |
| 4. |
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 | |
| 5. |
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 | |
| 6. |
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 | |
| 7. |
In active transport, the membrane structure that functions is |
| A. | cholesterol |
| B. | integral proteins |
| C. | carbohydrates |
| D. | hydrophobic molecules |
| Answer» C. carbohydrates | |
| 8. |
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 | |
| 9. |
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 | |
| 10. |
Lysozymes are found in |
| A. | plant cells |
| B. | animal cells |
| C. | microbial cells |
| D. | all of these |
| Answer» C. microbial cells | |
| 11. |
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 | |
| 12. |
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 | |
| 13. |
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. | |
| 14. |
In membranes, lipids are |
| A. | glycerophospholipids |
| B. | sphingolipids |
| C. | sterols |
| D. | all of these |
| Answer» E. | |
| 15. |
Which of the following is not found in membranes? |
| A. | Glycoproteins |
| B. | Glycolipids |
| C. | Nucleic acids |
| D. | Phospholipids |
| Answer» D. Phospholipids | |
| 16. |
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 | |
| 17. |
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. | |
| 18. |
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 | |
| 19. |
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. | |
| 20. |
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 | |