31 terms

Section 7

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Net movement of water into a cell occurs from what kind of solution
Hypotonic
All forms of passive transport depend on
the kinetic energy of molecules
Sodium-potassium pumps move
Na+ ions out of cells and K+ ions into cells
A structure that moves excess water out of unicellular organisms is a
contractile vacuole
Plasmolysis of a human red blood cell would occur if the cell were in a ________ solution
hypertonic
A cell must expend energy to transport substances using
cell membrane pumps
Which one of these choices is associated with active (energy using) transport?
SODIUM- POTASSIUM PUMPS
A concentration difference across space is called a (n)
concentration gradient
The uptake of solutes or fluids is called
pinocytosis
A relatively high solute concentration is called
hypertonic
A type of transport in which water moves across a membrane and down its concentration gradient is
osmosis
The shrinking of cells is known as
plasmolysis
When a human red blood cell is placed in a hypotonic environment, it will
undergo cytolysis
The energy needed to power the sodium-potassium pump is provided by the
splitting ATP
The uptake of large particles by a cell is known as
Phagocytosis
Most of the time, the environment that plant cells live in is
hypotonic
Diffusion is a term for the movement of molecules from
an area of high concentration to an area of low concentration
In a hypotonic solution, the concentration of solutes is lower than the
conc of solutes outside the cell
Molecules that are too large to cross a cell membrane are carried by
bulk transport
Substances that can pass through cell membranes by simple diffusion includew
CO2
Pinocytosis involves the transport of
fluids into a cell
A relatively low solute concentration is called
hypotonic
When the cells in a plant have low turgor pressure, the plant
wilts
Which molecules would diffuse faster?
small molecules, high temperature
The bursting of cells is called
cytolysis
Concentration of solutes inside and outside the cell are equal when the
isotonic
The process of diffusion requires
a cell membrane a difference in the concentration throughout a space
an aqueous solution
If the molecular concentration of a substance is the same throughout space, the substance
is in equilibrium
The contractile vacuole of a paramecium should be active when the paramecium is in
hypotonic environment
Facilitated diffusion is often used to transport
molecules that are not soluble in lipids
Exocytosis is a
A way for a cell to send large molecules ,such as protein
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