bis_104_mid_exam_key_ii_09

bis_104_mid_exam_key_ii_09 - BIS 104-002 Winter, 2009...

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BIS 104-002 Name ____________________________________ Winter, 2009 (last) (first) Midterm II Exam # _____ INSTRUCTIONS: 1. Print your name at the top of each page. 2. This exam consists of 4 questions on 7 pages worth a total of 60 points. Point values are given in parentheses. Make sure that you have a complete exam. 3. Write your answers in the spaces provided. 4. Write clearly; illegible answers will receive a score of zero. 5. Points may be deducted for failure to follow directions. 6. Please read and sign the statements blow: Authorization for public distribution (check one ) _______ I authorize the return of my exam for pickup by general distribution during class. _______ I do not authorize the public return of my exam (if you choose this option, you will pick up your exam from the instructor).
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Honor Code Statement My signature below affirms that I wrote this exam in the spirit of the honor system of UCD. I neither received nor furnished any help during the exam. Signature ___________________________________________ Page 1 Name ______________________________ 1. Facilitated passive diffusion of small solutes is mediated by two classes of proteins; channel proteins and transporter proteins. Compare and contrast channel proteins and transporters with respect to the following parameters: (the first one is done for you as an example). (6 pts) Channel Transporter Requirement for ATP hydrolysis not required not required
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a. Direction of transport with Always down the always down the respect to concentration of solute concentration gradient concentration gradient b.Physical association of the A multi-pass integral A multi-pass integral protein with the plasma membrane (transmembrane) protein (transmembrane) prot c. Ability to be regulated by Can be regulated by ligands can be regulated by molecules other than the solute competitive and non- competitive inhibitors d. Rate of flux of solute across the plasma membrane Extremely rapid Moderately rapid 10 x 10 6 ions/sec 50 x 10 4 /sec e. Kinetics of solute transport Linear kinetics Saturation kinetics
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f. Solute selectivity (specificity) Highly selective Highly selective Page 2 Name ______________________________ 2. The tissue lining the upper respiratory airway (bronchi & bronchioles) is composed of three cell types present in roughly equal proportions: (a) goblet cells producing mucus = 30%; (b) columnar ciliated cells = 30%, and (c) basal cells = 30%. a.
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This note was uploaded on 03/15/2010 for the course BIS BIS 104 taught by Professor Privalsky during the Fall '09 term at UC Davis.

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bis_104_mid_exam_key_ii_09 - BIS 104-002 Winter, 2009...

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