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

1.3 IB Bio

Membrane Structure

TermDefinition
Fluid Mosaic Model N/A
Davson-Denielli Model -Cell membranes consist of a phospholipid bilayer coated in protein -Explained how a 10nm thick membrane could be an effective barrier against substances -Two dark bands with lighter band in between -Proteins dark in electron micrograph
Freeze etched electron micro graphs -Rapid freezing and fracturing of cells, occurs in weak regions (occurred through middle of membrane)
Structure of membrane proteins -Structure of membrane proteins; are varied and globular in shape (not likely to form a continuous layer) -Some proteins have hydrophobic sections, they are attracted to hydrocarbon tails in center of membrane
Fluorescent antibody tagging -Antibodies will attach to particular proteins -Antibodies are fluorescently labeled green or red -One cell labeled green and another red (fused together with electric discharge) -After time red and green were evenly distributed throughout larger cell
Phospholipids form bilayers -Hydrophobic fatty acid tails repel water and are attracted to each other -Hydrophilic phosphate heads attract water and orient to face water (extra and intracellular fluid)
Membrane protein diversity -Parts of proteins that face outside the membrane (into the cell or towards the extra cellular fluid) are polar -Parts of proteins that face the hydrocarbon are non-polar -Some proteins will be associated with polysaccharides (glycoproteins/antlers)
Hormone binding sites -Immobilized enzymes -Cell adhesion -Cell to cell communication -Channels for passive transport -Pumps for active transport
Cholesterol in animal cell membranes and mammalian membranes -Reduces membrane fluidity by reducing phospholipid movement at moderate temps but it also hinders solidification at low temps -Also helps prevent some ions such as sodium from crossing the membrane because it is hydrophobic
Created by: averyschwarz