35259006
Description
Quiz by Alexandre Wolf, updated more than 1 year ago
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Created by Alexandre Wolf
almost 3 years ago
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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
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Water is only transported actively
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Moves from regions of high solute concentrations to low solute concentrations
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Moves from regions of low solute concentrations to high solute concentrations
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water has no net flow
Question 2
Question
Electrochemical gradients take both the concentration of the molecule in
question, as well as its':
Answer
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Charge
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Hydrophobicity
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Size
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Channel protein abundance
Question 3
Question
Passive transport involves molecules moving:
Answer
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Down their concentration gradient
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Up their concentration gradient
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With the use of highly energetic compounds (i.e. ATP)
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Together with other cargo molecules
Question 4
Question
What prevents other positively charged ions from passing through a K+ channel?
Answer
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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
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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
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When ions other than K+ enter the channel, the protein structure changes and closes the passage through the membrane
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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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