2.2 – Membrane Structure and Functions

Question 1

Fluid Mosaic Model

Answer 1

-membrane proteins float
freely throughout the phospholipid bilayer
-Membranes are not rigid with molecules locked into
place
-Membranes contain a mosaic (wide assortment) of
proteins

Question 2

Glycolipid

Answer 2

lipid attached to a
carbohydrate group

Question 3

Glycoprotein

Answer 3

protein
attached to a
carbohydrate group

Question 4

________ make up the majority of the cell membrane

Answer 4

Phospholipids

Question 5

How does bilayer form

Answer 5

Hydrophobic tails and Hydrophilic head form bilayer in water

Question 6

Sterols (commonly cholesterol) help to stop:

Answer 6

membranes from becoming too rigid in cold
temperatures and hold membranes together at
higher temperatures

Question 7

Integral Membrane Proteins

Answer 7

-embedded in lipid bilayer
-has areas that interact with water/lipids

Question 8

Peripheral Membrane Proteins

Answer 8

-On the surface of the membrane (one sided)
-Don’t interact with hydrophobic core of bilayer

Question 9

5 roles of membrane protein

Answer 9

transport, enzymatic activity, triggering signals, attachment, recognition

Question 10

Transport

Answer 10

move things across membrane

Question 11

Enzymatic activity

Answer 11

helps with cellular respiration and photosynthesis

Question 12

triggering signals

Answer 12

bind to chemicals & cause changes within the cell

Question 13

attachment

Answer 13

attach cytoskeleton/holds cells together

Question 14

recognition

Answer 14

allows cells to recognize eachother and invading pathogens
(diseases)