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Unformatted text preview: J pmtl1 1. At what stage of mitosis are chromosomes seen to decondense? A Prophase-e. Teteophase c. Metaphase 2. Astral microtubules of the mitoticspindle function to pull chromosomes during mitosis A.True-S. False 3. Howmanycentriolesdoes a cellhaveat metaphase?-A. 2 8.4 C.6 0.8 4. Klnetochores attach to the minus end of microtubules and contain motor protein complexes-A. True a.False 5. What is the primary function of catastrophins? A. protection of the cytoskeleton B. straightening mlcrotubules-C. destabilization of microtubules 6. Microtubule polymeriZation/depolymerization Is more dynamic during interphase A.True ~. False A. Which of the following best describes the directional growth of microtubules fromthe ce~me.during mitosis? A. mostly towards the kinetochores B. mostly towards the chromosomes C.random-8. The alignment of chromosomes at the metaphase plate is due to the opposing forces created by actin filaments from opposite' poles of the cell. A.True 'so False-9. Activation of the Anaphase Promoting Complex (APC) is under control of cyclins "A. True B. False 10. What term is used to describe the structure seen Inthe cell membrane at the beginning of vesicle formation?-A. a coated pit B.a dental ~ 11. The Signal Recognition Particle (SRP) binds to A. l1'!ehydrophilicsignal sequence of an emerging polypeptide . from the ribosome ,/ a. The SRP receptor only ~. The hydrophobic signal sequence of an emerging polypeptide from the ribosome and the SRP receptor 12. In cell biology, a vesicle refers to rA. a membrane bound structure in the cytoplasm B.a membraneboundstructureinthe cytoplasmthat only contains enzymes C. a membrane bound structure in the cytoplasm that only contains lipids BIO 321 Exam 4 fall 2003 Page 1 of.2 13. The Goigiapparatus is a membrane bound series of flatteMd13....
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