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Q: Intermediate filaments are not responsible for which of the following in eukaryotic cells? A Providing structure and shape to the nucleus. B Giving mechanical support for the cell. C Setting the limit for cell size. D Providing the cell a degree of extensibility. Tags: Cytoskeleton |

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Q: Kinesin motor proteins are responsible for moving the endoplasmic reticulum towards the periphery of a cell. A drug is introduced that depolymerises the microtubules along which kinesins move. What happens to the ER? A The ER collapses towards the nucleus. B The ER disperses into small vacuoles. C The ER disintegrates. D The ER merges with the cell plasma membrane. Tags: Cytoskeleton |

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Q: Which of the following cellular filaments are responsible for cellular streaming? A microfilaments B microtubules C intermediate filaments D cilia Tags: Cytoskeleton |

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Q: The microvilli of specialized epithelia like intestinal lining maintain their shape and are structurally composed of which of the following components? A Plasma membrane only B Plasma membrane covering an actin filament cytoskeleton C Plasma membrane covering a microtubule cytoskeleton D Plasma membrane covering various organelles like mitochondria or endoplasmic reticulum Tags: Cytoskeleton |

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Q: Listeria is a bacterial genus which is a major pathogen in humans. It has the interesting ability of utilizing actin units within the host eukaryotic cell for its motion. It contains an enzyme, ActA, which recruits host actin molecules; recruiting these molecules moves the bacteria forward. Which of the following can be assumed regarding these interactions? A ActA has a similar configuration to the kinesin motor protein B ActA has a similar configuration to the dynein motor protein C Host cell motility may be negatively affected by an infection of Listeria D None of the above Tags: Cytoskeleton |

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Q: Which of the following would be affected by a mutation in the actin protein? I. Mitosis II. Muscle contraction III. Cellular shape A II only B II and III only C I and III only D I, II and III Tags: Cytoskeleton | Musculoskeletal System |

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Q: Paclitaxel is a naturally-occurring compound which stabilizes microtubules, preventing their degradation. This would have the biggest impact on which of the following cellular processes? A DNA replication B muscle contraction C protein translation D mitosis Tags: Cytoskeleton |

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Q: If an individual were treated with a drug that inhibited the production of actin, which would NOT be directly affected? A muscle contraction B lymphocyte motility C villi and microvilli formation D desmosome cell junction Tags: Cytoskeleton | Musculoskeletal System |

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Q: A flagella is typically composed of: I. microtubules. II. microfilaments. III. intermediate filaments. A I only B I and II C II and III D I and III Tags: Cytoskeleton |

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Q: Which of the following organs would be expected to have the largest number of desmosomes? A liver B heart C spleen D kidney Tags: Cytoskeleton |

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Q: Which of the following is a true statement regarding the fluid mosaic model of cellular membranes? I. Proteins are embedded within a lipid bilayer II. Elasticity of the membrane is derived by the lipid bilayer III. The structure of the membrane is fairly rigid and held together by immobile cytoskeleton elements A I only B and II only C II and III only D I, II and III only Tags: Cytoskeleton |

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