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chp 3 Activities

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A primary active transport process is one in which __________.
the plasma membrane folds inward to form a vesicle containing extracellular material
an intracellular vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid
molecules pass directly through the phospholipid bilayer of the plasma membrane
molecules move across the plasma membrane without an input of energy
molecules move through transport proteins that have been activated by ATP
molecules move through transport proteins that have been activated by ATP
Yes! You've got it! 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
Some transport processes use transport proteins in the plasma membrane, but do not require ATP. This type of transport is known as _____.
endocytosis
simple diffusion
exocytosis
active transport
facilitated diffusion
facilitated diffusion
Yes! You've got it! Facilitated diffusion is a passive transport process during which molecules move down their concentration gradients through transport proteins
WWater moves across plasma membranes by osmosis, a process that is most similar to ____
cotransport
simple diffusion
facilitated diffusion
a process that requires energy from the cell
active transport
simple diffusion
Yes! You've got it!
The sodium-potassium pump uses ATP to move sodium and potassium ions across the plasma membrane. This statement describes _____.
primary active transport
secondary active transport
simple diffusion
facilitated diffusion
exocytosis
primary active transport
Yes! You've got it! The sodium-potassium pump is activated by ATP. This activation allows the pump to transport sodium and potassium ions against their gradients
vesicle fuses with the plasma membrane and releases its contents to the extracellular fluid. This statement describes _____.
simple diffusion
exocytosis
active transport
endocytosis
facilitated diffusion
Yes! You've got it! The term exocytosis literally means "out of the cell."