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HFF - Exam I > The Cell Membrane > Flashcards

Flashcards in The Cell Membrane Deck (17):

What is the cell membrane

The cell membrane is a biological membrane that seperates the interior of all cells of the outside enviorment


What is cholesterol and why is it important to the plasma membrane

Cholesterol is a sterol It is important because it helps maintain the rigidity of the cell membrane. Have too much and the cell is not permeable, have too little and the cell is too flexible


What is a micelle?

Micells are lipid molocules that form in a spherical form.


What is a lipid bilayer

The preferred structure of lipids in aqueous solutions. (Plasma membrane)


What is a vesicle?

Lipid bilayer in spherical shape. AKA Transporters within the cell.


Define the 5 different types of membrane proteins

1. Transmembrane - Span entirety of membrane, Usually function as gateways to permit substances across. 2. Intergral - Embedded within bilayer. 3. Peripheral - Attached to exterior of bilayer. Easily seperate off. 4. Associate Membrane Proteins 5. Anchored Membrane Proteins


Define a membrane domain

The association of the lipid membrane with the cytoskeleton filaments and the ECM through membrane proteins.


What is the most common type of Intergral Protein (IMP)

Transmembrane protein. There are multiple categories and they are based on how many times the TM passes the membrane


Explain the different types of lipid bilayer movements a fatty acid can do in the bi layer

Lateral diffusion: Most common (uncatalyzed) -Flip Flopping (catalyzed)


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What are the 3 general classes of membrane transport systems?

1. Uniport

2. Symport

3. Antiport


What is membrane fusion and give an example

Membrane fusion is the process by which 2 seperate lipid bilayers merge and become 1.


Example: Sperm fusing with an egg


What solutes are in simple diffusion?

Non polar compounds traveling DOWN concentration gradient


Which type of membrane transport travels down electrochemical gradient NO ATP

Facilitated diffusion


Membrane transport requires ATP & against electrochemical gradient?

Primary ACTIVE transport


What it secondary active transport?

against electrochemical gradient, driven by ions movind down its gradient


Describe an ion channel

Down electrochemical gradient, can be ligand gated or not.