ch 12

Question 1

lipid raft

Answer 1

specialized lipid regions within a membrane
rigid
hold specific proteins in place

Question 2

glycolipids

Answer 2

only on OUTSIDE layer
cell-cell communication

Question 3

glycocalyx

Answer 3

polysaccharide network that allows cells to reconize each other

Question 4

choloesterol

Answer 4

lipid that influences rigidity

Question 5

integral proteins

Answer 5

span whole membrane

Question 6

peripheral proteins

Answer 6

only attached to one side of bilayer

Question 7

how are peripheral proteins attached

Answer 7

glycolipid anchors
non covalent attraction to phospholipid heads
post-translational modification with fatty acidsi

Question 8

glycoproteins

Answer 8

proteins with sugars attached
cell-cell communication

Question 9

transport of a single molecule

Answer 9

passive diffusion
facilitated diffusion
active transport

Question 10

ligand-gated transporter

Answer 10

regulatory molecule binds and closes channel

Question 11

mechanically gated transporter

Answer 11

mechanical force on membrane closes channel

Question 12

voltage gated transporter

Answer 12

electrical charge of cell closes channel

Question 13

clathrin

Answer 13

coat protein that helps vesicle form

Question 14

dynamin

Answer 14

protein that closes off vesicle

Question 15

neuromuscular junction

Answer 15

site where neuron contacts the muscle

Question 16

extracellular matrix

Answer 16

space between cells

gives organ its shape and structure

Question 17

main components of ECM

Answer 17

proteoglycans
collagens
intergrins

Question 18

proteoglycans

Answer 18

proteins with long polysaccharide chains attached

Question 19

collagens

Answer 19

three polypeptides wrapped around each other
keep ECM rigid and sturdy

Question 20

intergrins

Answer 20

proteins in the cell membrane

bind to ECM fibers on the outside
bind to cytoskeleton on inside