Ex1Spr09Key - Examination I VPHY 3100 Elements of...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Examination I VPHY 3100 Elements of Physiology February 4th, 2009 1:25 - 2:15 p.m. Multiple Choice (2.5 points each) FOR EACH QUESTION, CHOOSE THE SINGLE BEST ANSWER. 1. The _______________ is the aqueous portion of the interior of any cell. A. cytoplasm B. cytosol C. organelle D. nucleus E. extracellular matrix 2. Most of our total body water resides: A. within cells. B. in the interstitial fluid. C. in the cerebrospinal fluid. D. in the blood plasma. E. within the extracellular fluid. 3. Most biological solutes: A. enter and exit cells via simple diffusion. B. enter and exit cells with the help of aquaporins. C. cannot freely diffuse through a phopholipid bilayer. D. are very hydrophobic and therefore require carrier proteins to assist in their movements through cell membranes. E. exist in the same concentrations both inside and outside of cells. 4. Suppose two aqueous solutions are separated by a partition. The solution on the right is a 150 m m (millimolal) NaCl solution; the solution on the left is 50 m m KCl and 100 m m glucose. The partition is permeant to water but does not allow glucose, sodium, potassium, or chloride to pass through. Which of the following statements is true ? A. There will be net water diffusion (osmosis) from the right compartment to the left compartment. B. The strong diffusional driving force on glucose will lead to net glucose movement from the left compartment to the right compartment. C. A voltage difference exists across the partition because there is a charge imbalance in one or both compartments. D. Although there is a strong diffusional driving force acting on sodium, there will be no net movement of sodium from one compartment to the other. E. Both solutions exert the same osmotic pressure. 5. In Question #4 above, the osmolality of the solution on the left is: A. 50 mOs m . B. 100 mOs m . C. 150 mOs m . D. 200 mOs m . E. 300 mOs m . 6. Which of the following statements about membrane transport proteins is true ? A. Pumps, such as the Na + /K + -ATPase, mediate primary active transport. B. All carriers, including uniporters, symporters, and antiporters, mediate secondary active transport. 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
C. All ion channels mediate facilitated diffusion. D. Both (A) and (C) are correct. E. All of (A), (B), and (C) are correct. 7. The Na + /K + -ATPase and the Na + /glucose cotransporter are similar in that they: A. provide a means by which Na + can move down its electrochemical gradient. B. directly hydrolyze ATP in order to drive their transport activities. C. mediate the uphill movement of at least one ion or molecule. D. are both antiporters. E. are both symporters. 8. The plasma membrane Ca 2+ pump hydrolyzes one ATP molecule, forming ADP and P i , in order to drive the movement of one Ca 2+ ion from the inside of the cell to the outside of the cell. This Ca 2+ pump: A. would contribute slightly to the resting membrane potential. B.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/17/2010 for the course VPHY 3100 taught by Professor W during the Spring '05 term at University of Georgia Athens.

Page1 / 7

Ex1Spr09Key - Examination I VPHY 3100 Elements of...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online