2809148
Descripción
Test por howcontrived, actualizado hace más de 1 año
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Creado por howcontrived
hace más de 9 años
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Pregunta 1
Pregunta
How will a small decrease in extracellular sodium ion concentrations affect sodium transport across the plasma membrane.
Respuesta
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Sodium ions will continue to move via simple diffusion into the cell.
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Sodium ions will still flow into the cell, but at a slightly slower rate.
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The direction of sodium ion movement will be reversed.
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Sodium transporters will require energy to pump the ions against their gradient.
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None of these answers is correct.
Pregunta 2
Pregunta
Which of the following is true about carbon dioxide transport?
Respuesta
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It diffuses freely across membranes.
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It require a carrier protein to diffuse into cells.
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Carbon dioxide and oxygen are transported in/out of the cell through an anti-porter.
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It is converted to bicarbonate in erythrocytes and transported from the body to the lungs.
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None of the above
Pregunta 3
Pregunta
Based on the patch clamp recording shown here, which of the following is true.
Respuesta
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The channel being recorded spends more time open than it does closed.
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The flow of ions through the channel is indicated by the increase in current.
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Sodium flows through the channel more often than calcium.
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The channel allows both negative and positive ions to flow through.
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None of these is true.
Pregunta 4
Pregunta
Binding of a ligand to its receptor of the cell membrane can directly cause:
Respuesta
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Opening of an ion channel.
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Activation of a carrier protein.
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Endocytosis.
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None of the above.
Pregunta 5
Pregunta
Glucose moves _____ its concentration gradient from the intestinal lumen into cells, and then ________ its gradient across the basal lamina.
Respuesta
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up, up
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up, down
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down, up
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down, down
Pregunta 6
Pregunta
Decreasing the proton concentration in the mitochondrial intermembrane space would __________ the production of ATP, via ATP synthase, an ______________________.
Respuesta
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increase, F-type pump
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Increase, ABC transporter
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Decrease, F-type pump
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Decrease, ABC transporter
Pregunta 7
Pregunta
Caffeine is an agonist for the ryanodine receptor. What effect would an increase in intracellular caffeine have on muscle cells? Why? There may be multiple correct answers.
Respuesta
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Muscle cells would contract more often because calcium would be released more often from the SR.
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Muscles would become more stiff because calcium would be removed from the cell more quickly.
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Muscle contraction would be stronger because more calcium would be released into the cytoplasm.
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None of these.
Pregunta 8
Pregunta
In which answer have the molecule been correctly arranged by their ability to freely diffuse across the plasma membrane, from least to most permeable.
Respuesta
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Ethanol, K+, nitrous oxide (NO), glucose.
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Sodium ions, glucose, oxygen, water.
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Protons , glucose, ethanol, carbon dioxide.
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Water, Cl-, glucose, nitrous oxide (NO).
Pregunta 9
Pregunta
Which of the following are true about voltage-gated ion channels?
Respuesta
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Size of pore and ability of channel to strip ion of water molecules determines which ions are allowed through.
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They only participate in passive transport.
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Most of them are opened by depolarization.
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Some of them contain an inactivating loop.
Pregunta 10
Pregunta
__________________ ATPases are responsible for pumping protons ________ their electrochemical gradient into vesicles. The proton gradient is then used to transport neurotransmitter __________ the vesicles.
Respuesta
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V-type, up, into
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F-type, up, out of
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V-type, down, into
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F-type, up, into
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ABC, up, out of
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