Membranes and Transport Q2 Flashcards
When referring to the cell membrane, what type of bond is unique to archaea allowing them to withstand higher temps?
Ether bonds instead of ester bonds.
What are some things that are not able to or have a hard time crossing the membrane?
Large uncharged polar molecules or ions.
What are the 4 types of membrane proteins and how are they located in the membrane?
Integral proteins: Spanning the width of the membrane
Peripheral proteins: Sit along the periphery of the cell
Assotiated proteins: usually interact with one of the other proteins.
Anchored Membrane protein: Self explanatory.
Which membranes are the easiest to remove from the membrane?
Peripheral and anchored proteins.
What is the fluid mosaic model referring to with plasma membranes?
It is talking about the fluidity of the membrane and the ability of proteins to float around within the membrane.
Vesicles and the plasma membrane are usually rich in which type of lipids?
Sphingolipids and cholesterol with phosphatidylethanolamine and phosphotidylserine
How is an integral protein able to be embedded in the membrane?
Because it has both hydrophobic and hydrophilic regions. The hydrophobic on the inside and the hydrophilic on the outside.
How is a membrane able to increase or decrease its fluidity?
By increasing or decreasing the saturation of the lipids.
What is the roll of flippase and floppasse
Flippase is able to take a phospholipid from the outrlayer and move it to the inner while floppase is able to take lipid from the inner layer and move to the outer.
The rafts located in membranes are rich in what type of lipids?
Sphingolipids and cholesterol.
How does simple diffusion work?
Nonpolar compunds entering cell as they move down their gradient
How does facilitated diffusion work?
Use of protein moving down electrochemical gradient.
How does primary active transport work?
Against electrochemical gradient driven by ATP.
How does secondary active transport work?
Against electrochemical gradient driven ion moving downs its gradient.
How do ion channels allow passage through membrane?
Down electrochemical gradient with the help of ligand gated.
