Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards




share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Adv. Bio Chapter 7

Membranes

TermDefinition
Selective Permeability A property of biological membranes that allows them to regulate the passage of substances across them.
Fluid Mosaic Model The currently accepted model of cell membrane structure, which envisions the membrane as a mosaic of protein molecules drifting laterally in a fluid bilayer of phospholipids.
Glycoprotein A protein with one or more covalently attached carbohydrates.
Osmosis The diffusion of free water across a selectively permeable membrane.
Tonicity The ability of a solution surrounding a cell to cause that cell to gain or lose water.
Isotonic Referring to a solution that, when surrounding a cell, causes no net movement of water into or out of the cell.
Hypertonic Referring to a solution that, when surrounding a cell, will cause the cell to lose water.
Hypotonic Referring to a solution that, when surrounding a cell, will cause the cell to take up water.
Facilitated Diffusion The passage of molecules or ions down their electrochemical gradient across a biological membrane with the assistance of specific transmembrane transport proteins, requiring no energy expenditure.
Active Transport The movement of a substance across a cell membrane against its concentration or electrochemical gradient, mediated by specific transport proteins and requiring an expenditure of energy.
Membrane Potential The difference in electrical charge (voltage) across a cell’s plasma membrane due to the differential distribution of ions. Membrane potential affects the activity of excitable cells and the transmembrane movement of all charged substances.
Exocytosis The cellular secretion of biological molecules by the fusion of vesicles containing them with the plasma membrane.
Ligand A molecule that binds specifically to another molecule, usually a larger one.
Electrochemical Gradient The diffusion gradient of an ion, which is affected by both the concentration difference of an ion across a membrane (a chemical force) and the ion’s tendency to move relative to the membrane potential (an electrical force).
Created by: Mr.Devine