Term
| What are the functions of a cell membrane? How many and name |
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Definition
4 functions
barrier, regulator, communicator, supporter |
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Term
| What are the two types of lipids in a cell membrane ? |
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Definition
| phospholipids and cholestrol |
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Term
| What is the function of cholestrol ? |
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Definition
| make membrane impermeable to water and make membrane more tolerate of temperature low and high ( stabilzes the membrane) |
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Term
| What forms can lipids aggragate in ? |
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Definition
| bilayer, micelles, liposomes |
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Term
How many and name functions of membrane proteins?
what functions do intrinsic proteins have? |
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Definition
4 functions
Enzymes, Structural, receptors, transporters
Intrinsic proteins= transporters and receptors (communication) |
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Term
| What types of channel proteins are there? |
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Definition
Open/leaky channels
closed/Gated channels |
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Term
| what is the function of Gated channels and how can they be gated? |
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Definition
Regulate movement
Ligand gated (chemically
Electrically gated (voltage)
Mechanically gated (Temperature and stretch) |
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Term
| Difference between channels and carrier proteins? |
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Definition
| carrier proteins never open to both sides at one time |
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Term
| Rate of diffusion of a membrane depends on ? |
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Definition
| Molecules lipid solubility, surface area, thickness of membrane, resist |
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Term
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Definition
SA x gradient x memb permibility /
Resistance of membrane x thickness of membrane |
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Term
| what does diffusion resistance depend on ? |
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Definition
| the moleculees liphilicity and the membrane composition of membrane |
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Term
| Carrier Mediated transport has what characteristicts |
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Definition
| specificity, saturation, competition |
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Term
| how does secondary active transport work |
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Definition
| couples kinetic energy of one molecule with movement of antoher |
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Term
| what is it and how does it work Phagocytosis ? |
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Definition
| cell eating , uses cytoskelton to engulf particles |
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Term
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Definition
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Term
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Definition
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Term
| What protien covers the indentations in cell membrane and vesicle surfaces in endocytosis? |
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Definition
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Term
| What are the different types of exocytosis? describe each one |
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Definition
Pinocytosis- non selective
Potocytosis- non selective uses caveolae to concentrate and internalize small molecules
Selective receptor mediated- recongizes ligand and moves to clathrin coated pit where it collapses and makes vesicle which is then sent to golgi or lysoome. clathrin coat recycled |
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Term
| Does endocytosis use the cytoskeleton ? |
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Definition
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Term
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Definition
| release of large impermeable molecules, AND replace cell membrane and membrane proteins |
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Term
| Decribe how exocytosis works |
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Definition
| Intra cellular secretory vesicle is transported to the membrane where it fuses |
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Term
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Definition
| force needed to stop osmosis |
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Term
| Compare osmolarity vs tonicity |
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Definition
| osmolarity depends on concentrations of particles in the solutions vs tonicity that looks at cell volumes |
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Term
| What is transcytosis ? where are contents released |
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Definition
| moves large molecules across MULTIPLE membranes contents released out into ECF |
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