Study your flashcards anywhere!
Download the official Cram app for free >
- Shuffle
Toggle OnToggle Off
- Alphabetize
Toggle OnToggle Off
- Front First
Toggle OnToggle Off
- Both Sides
Toggle OnToggle Off
- Read
Toggle OnToggle Off
How to study your flashcards.
Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key
Up/Down arrow keys: Flip the card between the front and back.down keyup key
H key: Show hint (3rd side).h key
A key: Read text to speech.a key
12 Cards in this Set
- Front
- Back
selective permeability
|
a membrane allows some substances to pass more easily than others
|
|
main membrane material?
|
phospholipids form into a bilayer
|
|
amphipathic
|
have both hydrophobic and hydrophillic regions --> phospholipid
|
|
fluid mosaic model
|
a membrane with a fluid structure w/ proteins embedded or attached to a double layer of phospholipids
|
|
embedded proteins
|
can move and they have often have hydrophobic and hydrophillic regions
|
|
fluidity
|
phospholipds move laterally very rapidly and often - it is very rare that they flip-flop
|
|
fluidity and temp
|
if temp. goes down too far, membrane get less solid which affects the function -- unsaturated phospholipids will remain more fluid at lower temp.
|
|
cholesterol
|
is wedged between phospholipids - at warmer temp. it restrains movement but at lower temp. keeps it
|
|
peripheral proteins
|
loosely bound to the surface of the embrane
|
|
integral proteins
|
penetrate the core of the bilayer, has a hydrophillic and hydrophobic (nonploar amino acids in alpha helices)
|
|
role of membrane proteins
|
reinforce shape of a cell and provide strong framework
|
|
sidedness
|
membrane has distinct inside and outside - lipid compositionmay be difft. therefore, when the membrane is synthesized(vesicles) the outside of the er/golgi will be the inside of the membrane
|