A primary active transport process is one in which _________.
answer
molecules move through transport proteins that have been activated by ATP
Primary active transporters, such as the sodium-potassium ATPase (or pump), are activated when ATP is hydrolyzed. This activation allows for the transport of solutes across the plasma membrane against concentration gradients.
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Some transport processes use transport proteins in the plasma membrane, but do not require ATP. This type of transport is known as _____.
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facilitated diffusion
Facilitated diffusion is a passive transport process during which molecules move down their concentration gradients through transport proteins.
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The majority of water molecules moving across plasma membranes by osmosis do so via a process that is most similar to ____.
answer
facilitated diffusion
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The sodium-potassium pump uses ATP to move sodium and potassium ions across the plasma membrane. This statement describes _____.
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primary active transport
The sodium-potassium pump is activated by ATP. This activation allows the pump to transport sodium and potassium ions against their gradients.
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A vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid. This statement describes _____.
answer
exocytosis
The term exocytosis literally means "out of the cell."
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