chapman cell bio Homework 3

chapman cell bio Homework 3 - BIOL 3510 Homework Assignment...

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Unformatted text preview: BIOL 3510 Homework Assignment #3 Due Tuesday, April 8 th 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 turn it by the end of class. Please compose your answers on the computer and turn in a hard copy; it must be typed. NO EMAIL assignments accepted this time. Put your name clearly 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 elses will result in a zero on the assignment for both (or all) individuals. Problems are 10 pts each. 1. Label the structures of the cell indicated by the lines on the figure below and give a brief process/ function associated with each structure. Figure Q1 A. nucleus houses the DNA and site of production of mRNA. Directs the cell in all higher functions. B. free ribosomes synthesize proteins by translating m-rna from the nucleus. C. rough endoplasmic reticulum ER stutted with ribosomes. D. Golgi apparatus packaging and distribution center for proteins made and modified in the endoplasmic reticulum. E. cytosol the cellular fluid which contains a nourishing broth of amino acids, ions and other molecules essential for life. What all cellular structures are suspended in. F. endosome membrane bound compartment of a eukaryotic cell through which endocytosed material passes on its way to the lysosome. G. plasma membrane Made of two layers of fatty acids, cholesterol and some proteins. It separates and protects the cell from the outside world. Site for cell communication and recognition. Allows for all the chemical gradients and potentials essential to cell life. H. lysosome degradative organelle which posseses hydrolytic enzymes and an acidic environment for digesting cellular materials. I. mitochondrion major site of ATP production. J. peroxisome contains production and degradation of hydrogen peroxide. Small organelle which uses hydrogen peroxide as an organic oxidizing agent. 2. When adrenaline binds to adrenergic receptors on the surface of a muscle cell, it activates a G-protein, initiating a signaling pathway where the activated G subunit activates adenylyl cyclase, increasing cAMP levels in the cell; the cAMP molecules then activate a cAMP-dependent kinase that, in turn, activates enzymes that result in the breakdown of muscle glycogen, thus lowering glycogen levels. You obtain muscle cells that are defective in various components of the G-protein signaling pathway. Indicate how glycogen levels would be affected in the presence of adrenaline in the following cells. Would they be higher, lower, or the same as normal cells that are treated with adrenaline?...
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This note was uploaded on 05/04/2008 for the course BIOL 3510 taught by Professor Chapman during the Spring '08 term at North Texas.

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chapman cell bio Homework 3 - BIOL 3510 Homework Assignment...

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