Plasma membrane Flashcards
maaf ya lambat
what does plasma membrane consists of?
a phospholipid bilayer with protein embedded
what is phospholipid bilayer?
refers to hydrophilic head and 2 hydrophobic tail
what is protein called that spans across the entire phospholipid bilayer?
an integral protein
what is protein called that exists on the outer parts of the phospholipid bilayer?
a peripheral protein
name of the arrangement?
fluid mosaic model (kalau salah kena cepuk)
why plasma membrane semi-permeable?
to allow only certain molecules to pass through
what particles easily pass PM?
small uncharged particles
what particles cannot pass PM?
highly-charged or very big
what 2 ways molecules can pass through PM?
diffusion & facilitated transport
what does it means when moving following concentration gradient?
from high to low concentration
what is facilitated transport?
something assisting a molecule to cross the membrane following concentration gradient
what is active transport?
something assisting a molecule across membrane against concentration gradient
why active transport require energy?
because it opposes the natural flow of particles
which exhibits saturation kinetics? active transport or facilitated diffusion?
both
most popular protein that use active transport?
sodium-potassium pump
2 ways things can enter or exit a cell other than through carrier system?
endocytosis and exocytosis
what is endocytosis?
plasma membrane invaginates and breaks off that allow things to enter
what is exocytosis?
PM invaginates and breaks off that allow things to exit the cell
what is phagocytosis?
special case of endocytosis which occurs when WBC want to remove pathogens or bacteria
how many phospholipid bilayer surrounds the mitochondria?
2, the inner membrane is arranged in shelf-like folds referred as cristae
how many phospholipid bilayers surround nucleus?
2, the two membranes have pores called nuclear pores
what is pinocytosis?
known as bulk-phase endocytosis.
- intake of liquids.
what is receptor-mediated endocytosis?
Involved membrane receptor on a membrane surface
- form tiny pits and inner part of plasma membrane coated with clathrin
