Cell Membrane Flashcards Preview

MCAT Biology > Cell Membrane > Flashcards

Flashcards in Cell Membrane Deck (10):
1

Integral Proteins

proteins that have one or more "segments" embedded in the membrane

2

surface proteins

contained entirely on the surface
used for cell signaling and identification

3

transport proteins

span the entire width of the bi-layer
channels and tunnels that facilitate transport

4

membrane receptor

any protein that specifically binds a signaling molecule that initiates a cellular response
ie. steroid receptors in cell nucleus
location dependent on polarity

5

cholesterol

inserted between phospholipids
helps make membrane impermeable to polar substances
adds to stability of membrane, maintaining fluidity

6

fluid mosaic model

dual-layer model of phospholipids
polar heads outward, tails inward
"fluid" refers to ability of phospholipids to move around

7

exocytosis

process by which a vesicle on the inside of the plasma membrane fuses with the plasma membrane dumping its contents into the extracellular environment

8

endocytosis

is the process by which a cell takes up small particles by invagination of the plasma membrane to form a vesicle called an endosome.

9

phagocytosis

type of endocytosis
invagination of very large particles, bacteria, etc., and only occurs in some cells.
always receptor-mediated

10

pinocytosis

the invagination of extracellular fluid and very small particles and occurs in all cells. Pinocytosis is non-specific