Sodium-potassium pump

Transports potassium ions into the cell

hypertonic solution

causes a cell to shrivel

isotonic solution

should have no affect on a cell

facilitated diffusion

transport of a specific substance down its concentration gradient by a carrier protein

exocytosis

helps a cell rid itself of wastes

phospholipids

double layer that makes up

cell membrane

gated ion channel

may be open or closed

hypotonic solutions

may cause a cell to burst

In the cell membrane, ion channels serve as

food molecules

or

passageways

passageways

The diffusion of water through a selectively

permeable membrane is

exocytosis

or

osmosis

osmosis

Which of the following is NOT a characteristic

of active transport?

It requires energy from the cell

or

It involves facilitated diffusion

It involves facilitated diffusion

Diffusion is the movement of a substance

only in liquids

or

from an area of high concentration to an area

of lower concentration

from an area of high concentration to an area

of lower concentration

Which type of membrane protein transmits information into the cell by responding to signal molecules?

receptor protein

or

marker protein

receptor protein

An ion channel is a transport protein that...

allows ions to move across the cell membrane so that the ions do not come in contact with the nonpolar interior of the lipid bilayer

or

has pores that are always open

allows ions to move across the cell membrane so that the ions do not come in contact with the nonpolar interior of the lipid bilayer

When particles move out of a cell through facilitated diffusion, the cell...

gains energy

or

does not use energy

does not use energy

The sodium-potassium pump...

helps cells maintain homeostasis

or

helps maintain a sodium ion grandient, which cells use to transport sugars across the membrane

or

Both A and C

Both A and C

Molecules that are too large to be moved through the cell membrane can be transported into the cell by...

endocytosis

or

diffusion

endocytosis

Which of the following occurs when a signal molecule binds to a receptor protein on a cell's surface?

the receptor can cause the formation

of a second messenger

or

All of the above

All of the above

If the concentration of a sugar solution is lower outside the cell that inside the cell, whichof the following will happen by osmosis?

sugar will move into the cell

or

water will move into the cell

Water will move into the cell

During which of the following processes do vesicles sometimes fuse with lysosomes?

osmosis

or

endocytosis

endocytosis