Cell Membrane

Question 1

Integral Proteins

Answer 1

proteins that have one or more “segments” embedded in the membrane

Question 2

surface proteins

Answer 2

contained entirely on the surface

used for cell signaling and identification

Question 3

transport proteins

Answer 3

span the entire width of the bi-layer

channels and tunnels that facilitate transport

Question 4

membrane receptor

Answer 4

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

Question 5

cholesterol

Answer 5

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

Question 6

fluid mosaic model

Answer 6

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

Question 7

exocytosis

Answer 7

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

Question 8

endocytosis

Answer 8

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

Question 9

phagocytosis

Answer 9

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

Question 10

pinocytosis

Answer 10

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