Lecture 8 - Plasma Membrane and Transport

Question 1

Factors Affecting Membrane Permeability

Answer 1

Characteristics of transported substance
Saturation of Phospholipids
Presence of Cholesterol
Temperature

Question 2

Substances that go through plasma membrane without extra help

Answer 2

hydrophobic / nonpolar molecules

Question 3

how does saturation affect permeability

Answer 3

unsaturate = more permeable
saturated = less permeable

Question 4

phospholipid movement

Answer 4

flip flop, lateral movement

Question 5

more cholestoral does what for permeability

Answer 5

more permeable

Question 6

membrane outer surface

Answer 6

non-cystosolic face
glycolipids

Question 7

peripheral proteins

Answer 7

loosely bound proteins on membrane or protein surface

Question 8

integral proteins

Answer 8

go through hydrophobic core of membrane

Question 9

6 protein cell functions

Answer 9

Transport
Enzymatic activity
Signal transduction
Intercellular joining
Cell-cell recognition
Attachment to cytoskeleton

Question 10

Carbohydrates on cell surface

Answer 10

glycoproteins
proteoglycans
glycocalyx

Question 11

Tight Junctions

Answer 11

interlockign junction proteins

Question 12

desmosome

Answer 12

spot like adhesion

Question 13

gap junction

Answer 13

tunnel

Question 14

carrier proteins

Answer 14

bind to substrate

Question 15

channel protein structure

Answer 15

alpha helix, beta barrel

Question 16

which channel protein structure have larger pores?

Answer 16

beta barrel

Question 17

Symport

Answer 17

2 molecules go through channel protein in same direction

Question 18

Symport and Antiport fall under this category

Answer 18

cotransport