MMG 409 Lectures 1-9

Description

this is all the pre class quizzes for the first 9 lectures compiled into a quiz.
Alexandre Wolf
Quiz by Alexandre Wolf, updated more than 1 year ago
Alexandre Wolf
Created by Alexandre Wolf almost 3 years ago
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Resource summary

Question 1

Question
Osmosis moves water according to the same concepts that guide passive transport. As water functions as a solvent, the passive flow of water:
Answer
  • Water is only transported actively
  • Moves from regions of high solute concentrations to low solute concentrations
  • Moves from regions of low solute concentrations to high solute concentrations
  • water has no net flow

Question 2

Question
Electrochemical gradients take both the concentration of the molecule in question, as well as its':
Answer
  • Charge
  • Hydrophobicity
  • Size
  • Channel protein abundance

Question 3

Question
Passive transport involves molecules moving:
Answer
  • Down their concentration gradient
  • Up their concentration gradient
  • With the use of highly energetic compounds (i.e. ATP)
  • Together with other cargo molecules

Question 4

Question
What prevents other positively charged ions from passing through a K+ channel?
Answer
  • The specific residues of the K+ channel allow water to pass the K+ ion through the water chain, but do not allow water to pass different ions
  • Positively charged residues in the channel push K+ ions perfectly through the pore, while other positive ions are the wrong size to pass through the passage
  • When ions other than K+ enter the channel, the protein structure changes and closes the passage through the membrane
  • The structure of the K+ channel fully stabilizes K+, thereby stripping away water molecules. Other ions do not fit perfectly, and therefore are more favorably associated with water.
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