Chapman Cell Bio My completed homework 4

Chapman Cell Bio My completed homework 4 - BIOL 3510...

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BIOL 3510 Homework Assignment #4 Due Tuesday, April 29 by the end of class. No late assignments will be accepted. You may turn it in early if you wish by placing it in my mailbox in the SRB room 120. Otherwise I prefer you turn it in at the beginning of class. Please compose your answers on the computer and turn in a hard copy; it must be typed. NO EMAIL assignments accepted. Put your name and ID number on each page of your answers and staple them in the upper left hand corner . Read the questions carefully before crafting your answer. You may use your books, notes, etc., and you may discuss the questions with me or classmates but compose your answers yourself . Answers that appear to be substantially identical to someone else’s will result in a zero on the assignment for both (or all) individuals. 1. Indicate which of the three major classes of cytoskeletal elements each statement below refers to. A. monomer that binds GTP Alpha G-tubulin B. includes keratins and lamins Intermediate Filaments C. important for formation of the contractile ring during cytokinesis Actin D. supports and strengthens the nuclear envelope Intermediate Filament E. their stability involves a ATP cap Actin F. used in the eucaryotic cilia Microtubules G. a component of the mitotic spindle Microtubules H. can be connected through desmosomes Intermediate I. directly involved in muscle contraction Actin I. abundant in lamellipodia Actin 2. Do you agree or disagree with this statement? Explain your answer. Plus end-directed microtubule motors (like Kinesins) deliver their cargo to the periphery of the cell, whereas minus end-directed microtubule motors (like Dyneins) deliver their cargo to the interior of the cell. I agree. The plus end-directed microtubules do typically point to the periphery of the cell. This is due to the centromeres, which are located in the center of the cell “nucleates” microtubule growth. It is here that the minus end-directed microtubules are located. It makes sense then that the plus end-directed motors
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would direct cargo to the periphery and not to the center. The minus end-directed motors would direct cargo to the center. 3. What role does nucleotide hydrolysis play in actin polymerization ? and tubulin polymerization? Nucleotide hydrolysis weakens the bonds between the subunits in actin and tubulin. This enhances depolymerization in both.
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4. You isolate some muscle fibers to examine what regulates muscle contraction. When you bathe the muscle fibers in a solution containing ATP and Ca
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Chapman Cell Bio My completed homework 4 - BIOL 3510...

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