Bio 200- Membrane Structure And Function

Front 1

The _____________ is the boundary that separates the living cell from its surroundings

Back 1

plasma membrane

Front 2

Structure:
* _________________
* Fluidity of membrane
* Asymmetric nature

Back 2

Membrane models

Front 3

Structure:
*Membrane models
*Fluidity of membrane
*_________________

Back 3

Asymmetric nature

Front 4

The plasma membrane exhibits ______________, allowing some substances to cross it more easily than others.

Back 4

selective permeability

Front 5

What is the function of the plasma membrane?

Back 5

Transport

Front 6

What are the types of transport relevant to the plasma membrane?

Back 6

Passive, Active, and Large Molecule Transport

Front 7

Passive transport:
*Diffusion and Osmosis
*__________________
-Transport proteins

Back 7

Facilitated diffusion

Front 8

Passive transport:
*Diffusion and Osmosis
*Facilitated diffusion
-______________

Back 8

Transport proteins

Front 9

Passive transport:
*________________
*Facilitated diffusion
-Transport proteins

Back 9

Diffusion and Osmosis

Front 10

What is the thickness of the plasma membrane?
a) 1 nm
b) 0.08 nm
c) 0.01 nm
d) 100 nm
e) 8 nm

Back 10

e) 8 nm

Front 11

Active transport:
*_____________
*Co-transport

Back 11

Ion Pumps

Front 12

Active transport:
*Ion Pumps
*_____________

Back 12

Co-transport

Front 13

True or False: The plasma membrane is primarily composed of phospholipids.

Back 13

True.

Front 14

True or False: The plasma membrane is primarily composed of glycolipids.

Back 14

False. The plasma membrane is primarily composed of phospholipids.

Front 15

True or False: The plasma membrane is primarily composed of aminolipids.

Back 15

False. The plasma membrane is primarily composed of phospholipids.

Front 16

Phospholipids are ___________, which means they have both hydrophobic and hydrophilic regions

Back 16

amphipathic

Front 17

_____________ is when a molecule bears both hydrophobic and hydrophilic regions.

Back 17

amphipathic

Front 18

True or False: If a molecule doesn't dissolve in water, it is amphipathic.

Back 18

False.

Front 19

True or False: Phospholipids in the plasma membrane can move within the bilayer.

Back 19

True.

Front 20

True or False: Phospholipids in the plasma membrane never move within the bilayer.

Back 20

False. Phospholipids in the plasma membrane can move within the bilayer.

Front 21

Most of the lipids, and some proteins, drift _________ .

Back 21

laterally

Front 22

The degree of fluidity is regulated by ___________ .

Back 22

lipid content

Front 23

What role does cholesterol play in the function of the plasma membrane?

Back 23

Cholesterol helps stabilize the membrane by restraining movement of phospholipids at warm temps, and acting as a sort of "antifreeze" at lower temps

Front 24

As temperatures cool, membranes switch from a _________ state to a _______ state.

Back 24

As temperatures cool, membranes switch from a "fluid" state to a "solid" state.

Front 25

The temperature at which a membrane solidifies depends on the types of __________.

Back 25

Lipids

Front 26

What determines the temperature at which a membrane solidifies?

Back 26

Lipids

Front 27

True or False: Membranes rich in unsaturated fatty acids are more fluid that those rich in saturated fatty acids

Back 27

True

Front 28

Membranes rich in _________ fatty acids are more fluid that those rich in ___________ fatty acids

Back 28

Membranes rich in unsaturated fatty acids are more fluid that those rich in saturated fatty acids

Front 29

The ____________ confines protein movement in membranes.

Back 29

Cytoskeleton

Front 30

True or False: Proteins diffuse 100X faster in natural membranes compared to artificial membranes

Back 30

False. Proteins diffuse 100X slower in natural membranes compared to artificial membranes because of the cytoskeleton.

Front 31

A __________ is a collage of different proteins embedded in the fluid matrix of the lipid bilayer

Back 31

membrane

Front 32

_________ determine most of the membrane’s specific functions

Back 32

Proteins

Front 33

The ____________ “fences in” proteins to limit movement across the membrane

Back 33

Cytoskeleton

Front 34

True or False: Proteins diffuse 100X faster in artificial membranes compared to natural membranes.

Back 34

True.