MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Cell Biology knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Lamellipodium is a protrusion of ________________ |
| A. | actin filaments |
| B. | fibroblasts |
| C. | myoblasts |
| D. | neurons |
| Answer» B. fibroblasts | |
| 2. |
ActA, a surface protein activates the ______________ |
| A. | Arp2/3 complex |
| B. | Sar1 |
| C. | Arf1 |
| D. | EcoR1 |
| Answer» B. Sar1 | |
| 3. |
An organism in which cell motility takes place solely as a result of actin polymerization is ____________________ |
| A. | <em>E. coli</em> |
| B. | <em>Corynebacterium</em> |
| C. | <em>Listeria monocytogenes</em> |
| D. | <em>Clostridium botulinum</em> |
| Answer» D. <em>Clostridium botulinum</em> | |
| 4. |
The protein responsible for muscular dystrophy, dystrophin, is a __________ protein. |
| A. | cross-linking |
| B. | membrane-binding |
| C. | tethering |
| D. | severing |
| Answer» C. tethering | |
| 5. |
Cross-linking proteins villin and fimbrin are found in ___________ |
| A. | neurons |
| B. | myoblasts |
| C. | microvilli |
| D. | flagella |
| Answer» D. flagella | |
| 6. |
Filamin is an example of ___________ proteins. |
| A. | capping |
| B. | depolymerization |
| C. | motor |
| D. | cross-linking |
| Answer» E. | |
| 7. |
Which of the following can fragment actin filaments? |
| A. | profilin |
| B. | thymosin |
| C. | cofilin |
| D. | vimentin |
| Answer» D. vimentin | |
| 8. |
Which of the following has an opposing role as that of thymosin? |
| A. | chymosin |
| B. | vimentin |
| C. | profilin |
| D. | niacin |
| Answer» D. niacin | |
| 9. |
Tropomodulin is a ___________ |
| A. | monomer-sequestering protein |
| B. | capping protein |
| C. | monomer unit |
| D. | motor protein |
| Answer» C. monomer unit | |
| 10. |
Monomer-sequestering proteins are responsible for high concentration of G-actin in nonmuscle cells. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 11. |
Which of the following binds to G-actin? |
| A. | thymosin |
| B. | lysin |
| C. | kinesin |
| D. | chymosin |
| Answer» B. lysin | |
| 12. |
Which of the following nucleating protein generates unbranched actin filaments? |
| A. | formin |
| B. | kinesin |
| C. | globulin |
| D. | vimentin |
| Answer» B. kinesin | |
| 13. |
Nucleation is the slowest step in actin filament formation. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 14. |
Which type of cytoskeletal elements are involved in nonmuscle motility? |
| A. | microfilaments |
| B. | flagella |
| C. | intermediate filaments |
| D. | microtubules |
| Answer» B. flagella | |
| 15. |
Cortex (of a cell) is located beneath the _____________ |
| A. | nucleus |
| B. | mitochondria |
| C. | ribosomes |
| D. | plasma membrane |
| Answer» E. | |