Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account

What do all cells have

Cell Membrane(plasma membrane)

Cell membranes control what _____________ the cell to maintain an internal balance called ________

enters and exits

What do cell membranes provide?

protection and support

What is structure of the cell membrane

Lipid bilayer

What are lipid bilayer made from

2 layer of phospholipids

Phosphate head is ______


what does hydrophilic

water loving

Fatty Acid tails are ______


what does hydrophobic

water fearing

What are embedded in the membrane


Phospholipids are the modified so that a _______(PO4-) replaces one of the three fatty acids normally found on a lipid. The addition of this group makes a _________________

Phosphate group,
polar head and 2 non polar tails

Fluid mosiac of the cell membrane

Molecules move freely in the membrane(fluid)

What do cell membranes have ____in them


Selectively permeable

allows some molecules in and keep others out

What helps it be selective?

the structure

What are two types of cellular transport?

Passive and Active

Passive Transport


In passive transport, do cells use energy or not

Cells do not use energy

In passive transport, molecules move _____


In passive transport, molecules spread out from an area of ____ concentration to an area of ____ concentration

high; low

high to low, fluids will ____


What are four types of passive transport

simple diffusion
facilitated diffusion
ion channels


random movement of particles from an area of high con. to low con.

diffusion continues until what happens

equilibrium is reached

Facililated Diffusion

diffusion of specific particles through carrier proteins

what are carrier proteins

they select only certain molecules to cross the membrane

What do carrier proteins transport?

large or changed molecules

Osmosis(simple diffusion)

diffusion of water through a a selectively permeable


the solution has a lower concentration of solute and a higher concentration of water than inside of the cell

Whats the result of hypotoncic

water moves from the solution to inside the cell. cell swells and bursts open(cytolysis)


the solution has a higher and lowerr concentration of h20 than inside of the cell

Whats the result of the hypertonic cell

water moves from inside the cell into the solution. the cell shrinks. c plasmolysis


the concentration of solutes in the solution is equal to the concentration of solutes inside of the cell

Whats the result of being isotonic

water moves equally in both directions and the cell remains the same size(dynamic equilibrium)

How do bacteria and plants cells deal with osmosis pressure

they have cell walls that prevent them from over-expanding. In Plants the pressure exerted on the cell wall is called turgour pressure

How do protist like paracieum deal with osmosis pressure

has contractile vacules that collect water flowing in and pump it out

Ion channels

membrane proteins similar to carrier proteins transport ions from high to low concentration

How do the ions get through

because they cant pass through the nonpolar part of the lipid bilayer so they are shielded by protein channel

What type of energy does active transport use


does active tranport require energy


Active transport

movement from a low area of concentration to an area of high concentration

what are 3 types of active transport

Protein pumps

Protein pumps

transport proteins that require energy to do work


taking bulky material into a cell
-cell membrane in-folds around particle
-forms vesicle/vacuole around particles

what are two types of endocytosis



cell eating


cell drinking


forces materials out of cell in bulk
-membrane surrounding the material fuses with cell membrane
-cell changes shape

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording