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Chapter 2. Overview of Cellular Physiology
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The electrogenic Na, K ATPase plays a critical role in cellular physiology by
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A. using the energy in ATP to extrude 3 Na+ out of the cell in exchange for taking two K+ into the cell.
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B. using the energy in ATP to extrude 3 K+ out of the cell in exchange for taking two Na+ into the cell.
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C. using the energy in moving Na+ into the cell or K+ outside the cell to make ATP.
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D. using the energy in moving Na+ outside of the cell or K+ inside the cell to make ATP.
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A. contain relatively few protein molecules.
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B. contain many carbohydrate molecules.
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C. are freely permeable to electrolytes but not to proteins.
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D. have variable protein and lipid contents depending on their location in the cell.
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E. have a stable composition throughout the life of the cell.
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A. are substances that interact with first messengers outside cells.
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B. are substances that bind to first messengers in the cell membrane.
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C. are hormones secreted by cells in response to stimulation by another hormone.
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D. mediate the intracellular responses to many different hormones and neurotransmitters.
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E. are not formed in the brain.
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A. is an organelle that participates in the breakdown of proteins and lipids.
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B. is an organelle that participates in posttranslational processing of proteins.
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C. is an organelle that participates in energy production.
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D. is an organelle that participates in transcription and translation.
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E. is a subcellular compartment that stores proteins for trafficking to the nucleus.
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A. includes phagocytosis and pinocytosis, but not clathrin-mediated or caveolae-dependent uptake of extracellular contents.
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B. refers to the merging of an intracellular vesicle with the plasma membrane to deliver intracellular contents to the extracellular milieu.
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