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Unformatted text preview: Name__________________________________________ Discussion Quiz 1 Question 1: The following table summarizes the approximate concentrations of ions found inside and outside of a mammalian neuron (brain cell). Ion Intracellular (mM) Extracellular (mM) Na+ 18 145 K+ 135 3 Cl- 7 120 Ca2+ 0.0001 1.2 Assuming that the neuronal membrane is only permeable to Na+, K+, and Ca2+, and no ATP is available for transport, answer the questions below: 1.1 Which of the following is TRUE? A: K+ will flow into the neuron against its concentration gradient B: There is no net flow of Na+ ions across the membrane C: Cl- will flow into the cell down its concentration gradient D: Flow of Ca2+ will make the inside of the cell more positive 1.2 The ability of some ions and molecules, but not others, to cross the membrane is due to the membrane's __________________________ ________________________ (2 words) Question 2: What are the 4 factors mentioned in lecture that influence membrane fluidity? 1) 2) 3) 4) Question 3: Which of the following concerning the cytoskeletal elements from Lecture is TRUE? A. Microtubules are hollow and thinner than microfilaments B. Microfilaments are important for cell shape and trafficking of organelles. C. The "-" ends of both are anchored to protein complexes D. The motor protein(s) associated with each only move in one direction E. Subunits are added and subtracted to the "+" end of microfilaments. Name__________________________________________ Question 4: The diagram to the right is a vesicle containing a new neurotransmitter receptor . 1. Which molecular motor is responsible for trafficking this vesicle to the plasma membrane? __________________________ 2. Where in the cell is the molecular motor from #1 synthesized?__________________________ 3. Put an "X" on the part of the receptor where, after the vesicle has incorporated into the membrane, a ligand would bind. Question 5: Which of the below is TRUE? A. Cytoplasmic proteins that break down alcohol are made in the smooth ER. B. Secreted and transmembrane proteins are synthesized in rough ER lumen C. The rough ER is important for calcium sequestration D. Both the rough and smooth ER synthesize lipids E. A reduction in smooth ER promotes alcohol tolerance Question 6: (Complete this one last) To date, what material or concept presented in lecture do you find most difficult? ...
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This note was uploaded on 11/22/2010 for the course BIOLOGY SC Bio Sci 93 taught by Professor Dr.dianeo'dowdanddr.rahulwarrior during the Fall '10 term at UC Irvine.

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