Unit 3.2 Flashcards
Membrane proteins, transport types?
Channel and Carrier.
Characteristics of carrier mediated proteins?
Small to medium size solutes
Specifically
Saturation(limit to asking if transport\ Tm)
Transport rate (number of carriers)
Compitition
What are the two types of carrier mediate transports?
Passive transport - facilitated diffusion( use of a helper), no ATP needed because use of concentration gradient. Low to high.
Active transport - primary active and secondary active transport. Required energy, from high to low.
What makes the reaction to create more carrier proteins?
Insulin.
What are the characteristics of passive transport?
Facilitated diffusion(helper), no ATP needed.
Uses concentration gradient (low to high)
What are the characteristics of active transport?
Primary active transport
Secondary active transport
Required ATP(high to low).
The function of passive facilitated diffusion?
Carrier protein
Area of high to low concentration
Needs concentration gradient
What is the type of facilitated diffusion for glucose?
Glucose transport=GLUT
What is the function of primary active transport pumps?
Low to high
Directly uses ATP
What is a example of primary active transport?
Calcium(+2) pump, low concentration to high inside cell.
Potassium\sodium(+) pump, 3 na+ oUT and 2 k+ in.
Secondary active transport functions\characteristics?
Low to high.
Linked to pumps, if pumps stop(blockage) then secondary transport stops.
Not directly uses ATP.
An example of Secondary active transport?
Na(+) w\ glucose symporter.
No need for ATP because Na+ uses glucose concentration gradient from high (inside) to low outside.
What is the sodium hydrogen antiporter?
From high to low, sodium in and hydrogen out. It’s main function is to keep acidity in check.
What is the difference between symporter and antiporter!
Symporter=same direction
Antiporter=different direction
What is vescular transport?
Active transport
Assisted transport of large molecules
Requires ATP
What are the three endocytosis?
Phagocytosis, big cell eater. ex)lympsome digest bacteria
Pinocytosis (cell drinker/smaller and mostly filled with water).
Receptor mediated endocytosis, binds with cytosis\receptors then starts digestion. ex)HIV and receptors mediate.
What is the opposite of endocytosis (in)?
Exocytosis (out), during process membrane of vesicles fuses with plasma membrane and it’s contents are released.
What are the three types of diffusions under passive transport?
Diffusion, Osmosis and facilitated diffusion.
What are the three types of transport under active ?
Primary,, secondary and vesicular (endocytosis).
What are the types of gates ion channels?
Voltage, chemical and mechanical.
What is a leak channels and a example?
Ions that move down their concentration gradient through water filled channels.
K and Na leak channels.
What is a ligand ?
A molecule that is needed to open ion bagged channels.
What are the names for water channels?
Aquaporins , cab what’s be opened our regulated.
What is membrane potential?
The difference of electrical charge across plasma membrane, measured in millivolts.
What is the testing membrane potential?
-70mV
What is the main leak channel?
Potassium and sodium ion leak channel.
