The Cell Membrane

Question 1

function of the membrane

Answer 1

• keeps all cellular components in
• allow molecules to enter/leave
• isolate organelles from cytoplasm

Question 2

davidson danielli model

Answer 2

first model; falsified

stated: that protein layer surrounded phospholipid

Question 3

fluid mosaic model

Answer 3

• singer-nicolsen (also backed up by braxton)

Question 4

what is the phospholipid bilayer

Answer 4

-two sets of phospholipid tails and heads which make up the structure of the cell membrane

Question 5

what is the phospholipid head and tail

Answer 5

head: phospate. polar. hydrophilic
tail: fatty acid. non-polar. hydrophobic.

Question 6

components of the cell membrane

Answer 6

• phospholipids
• proteins
• cholesterol

Question 7

types of proteins

Answer 7

-intergral and peripheral (which contain glycoproteins)

Question 8

functions of proteins

Answer 8

transport: protein channels(passive) and pumps(active)
sites for hormone binding
enzymatic action
cell adhesion
cell to cell communication

Question 9

function of cholesterol

Answer 9

maintain membrane

fluidity

Question 10

function of integral proteins

Answer 10

-channels for transport of polar molecules, receptors for hormones or growth factors, enzymes and cell adhesion

are throughout the cell membrane

Question 11

why is the fluid mosaic called that

Answer 11

fluid= because the molecules are in constant motion
mosaic= collection of different things stacked together
model= representation of real life

Question 12

function of peripheral proteins

Answer 12

-receptors for hormones/transmitters
-cell recognition
Are at the edge of the membrane. SURFACE

Question 13

function of glycoprotein

Answer 13

-peripheral protein with a glycerol attachment . Immune responses and cell recognition. Are at the edge of the membrane. SURFACE