35259006
Descripción
Test por Alexandre Wolf, actualizado hace más de 1 año
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Creado por Alexandre Wolf
hace más de 2 años
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Pregunta 1
Pregunta
Osmosis moves water according to the same concepts that guide passive
transport. As water functions as a solvent, the passive flow of water:
Respuesta
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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
Pregunta 2
Pregunta
Electrochemical gradients take both the concentration of the molecule in
question, as well as its':
Respuesta
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Charge
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Hydrophobicity
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Size
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Channel protein abundance
Pregunta 3
Pregunta
Passive transport involves molecules moving:
Respuesta
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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
Pregunta 4
Pregunta
What prevents other positively charged ions from passing through a K+ channel?
Respuesta
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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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