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36 Cards in this Set

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Which of the following transmit information into a cell by binding to signal molecules?
receptor proteins
The sodium-potassium pump prevents the accumulation of ____________ ions inside the cell
sodium
acts as a signal molecule in the cytoplasm
signal molecule
carries information throughtout the body and to other cells
ion channel
Ion channel gates close the pores of some ion channels in response to
1.stretching of the cell membrane
2.a charge in electrical charge
3.the binding of specific molecules to the channel
a protein that binds to a specific signal molecule
receptor protein
In active transport, energy is required to move a substance across a cell membrane.
t
During diffusion, molecules diffuse from a region where their concentration is low to a region where their concentration is higher, until the particles are evenly dispersed.
F
Biology 1 Chapter 4
Mr. Luring
Cut Apart and Study

ALSO study notes and worksheets from class.
Substances always flow from an area of high concentration to an area of __________ concentration
low
Diffusion is an active process that requires a cell to expend a great deal of energy
F
When the concentration of dissolved particles outside a cell is equal to the concentration of dissolved particles inside the cell, the cell solution is isotonic
T
The diffusion of water into or out of a cell is called
osmosis
Passive transport uses ATP to move moelcules against their concentration gradient.
F
The sodium-potassium pump
decreases the concentration of sodium ions inside a cell.
increases the concentration of potassium ions inside a cell.
Ions move through ion channels by
passive transport
Signal molecules bind to
receptor proteins
Sugar molecules cross the cell membrane by
facilitated diffusion
Osmosis is a type of
passive transport
If a cell is placed in a(n) ______________solution, water will flow into the cell
hypertonic
A receptor protein sends signals into a cell by transporting a specific molecule through the cell membrane
F
The sodium-potassium pump
is a carrier protein
Transport proteins that allow ions to pass through the cell membrane are called
ion channels
The sodium-potassium pump usually pumps
Potassium ions into the cell
The sodium-potassium pump transports sodium ions out of a cell while causing potassium ions to move into the cell
T
Facilitated diffusion moves molecules and ions against their concentration gradient, while active transport moves molecules and ions down their concentration gradient
F
Osmosis is the diffusion of starch molecules through a selectively permeable membrane
F
Ridding the cell of materials by discharging the materials in vesicles is called
exocytosis
Water will diffuse out of a cell when the cell is placed in a hypertonic solution.
T
Which of the following is a form of active transport
sodium-potassium pump
A cell will swell when it is placed in a(n)
hypotonic solution
A cell does not expend ___________ when diffusion takes place
energy
In facilitated diffusion, ______________ proteins are used to transport substances down their concentration gradient.
carrier
The sodium-potassium pump usees energy supplied by
ATP
The diffusion of ____________ through cell membranes is called osmosis.
water
The dispersal of ink in a beaker of water is an example of
diffusion