membranes

Question 1

what is the function of cholesterol in the plasma membrane?

Answer 1

controls fluidity

Question 2

Which part of the phospholipid is hydrophilic and which parts is hydrophobic?

Answer 2

hydrophilic = head
hydrophobic = tail

Question 3

What is the function of the phospolipid bilayer?

Answer 3

1. forms the structure
2. hydrophobic barrier
3. fluidity

Question 4

name the different types of proteins you can get in the plasma membrane?

Answer 4

1. integral -embedded
2. peripheral-on top
3. transmembrane -span the membrane

Question 5

what is diffusion?

Answer 5

net movement from high to low concentration

Question 6

What factors affect diffusion?

Answer 6

1. magnitude of gradient
2. surface area
3. lipid solubility of substance
4. molecular weight of substance
5. distance

Question 7

what is osmosis?

Answer 7

the net movement of water molecules from high to low concentration

Question 8

what is primary and secondary active transport?

Answer 8

primary= energy directly needed to move substance
secondary= energy not used directly

Question 9

What is active transport?

Answer 9

an active process requiring energy and a protein carrier which moves molecules from low to high concentration

Question 10

in the sodium potassium pump how many sodium ions are pumped out of the cell?

Answer 10

3

Question 11

in the sodium potassium pump how many potassium ions are pumped into the cell?

Answer 11

2

Question 12

name 2 types of vesicular transport

Answer 12

endocytosis and exocytosis