The cell membrane (E1)

Question 1

fluid mosaic model

Answer 1

depicts the membrane as a mosaic of protein, lipid, and carbohydrate molecules bobbing in a fluid of phospholipids

Question 2

factors that affect permeability

Answer 2

• unsaturated vs saturated fatty acids
• length of tails
• # cholestesterol in membrane
• temperature

Question 3

cholesterol

Answer 3

component of animal cells affect fluidity at high temps

Question 4

intrinsic/integral proteins

Answer 4

can’t be released from the membrane

Question 5

transmembrane

Answer 5

proteins physically embedded in the hydrophobic of the phospholipid bilayer (the tails)

Question 6

lipid anchored

Answer 6

amino acids covalently attach to the lipids

Question 7

peripheral/extrinsic membrane proteins

Answer 7

noncovalently bonded project out from the membrane or polar head groups of phospholipids

Question 8

DELETEfunctions of proteins (6)

Answer 8

• transport
• enzymatic activity
• signal transduction
• cell-cell recognition
• intracellular joining
• attachment to the cytoskeleton and extracellular matrix

Question 9

passive transport

Answer 9

no energy

Question 10

diffusion

Answer 10

spontaneous movement of solutes from high to lower

Question 11

facilitated diffusion

Answer 11

diffusion with the help of transport protein

Question 12

channel proteins

Answer 12

hydrophilic

Question 13

Which type of molecules have the hardest time getting through the membrane

Answer 13

ions of any sort! They have a charge so they will be repelled!!