Bioflashcards7.0exam#2

Question 1

Selective permeability

Answer 1

Allowing substances to cross than others

Question 2

AMphipathic

Answer 2

Hydrophobic and hydrophillic

Question 3

Cellular membranes are ? of lipids and proteins

Answer 3

Fluid mosaics

Question 4

What is the fluid mosaic model?

Answer 4

A fluid structure with various proteins embedded in it

Question 5

Are proteins randomly distributed in the fluid mosaic model?

Answer 5

No

Question 6

? in plasma membrane can move within the bilayer

Answer 6

Phospholipics

Question 7

What effects membrane fluidity?

Answer 7

Temperature

Question 8

? fatty acids are more fluid than ?

Answer 8

Unsaturated are more fluid than saturated

Question 9

? have kinks in their structures

Answer 9

Unsaturated

Question 10

What restrains movement oh phospholipids?

Answer 10

Cholesterol

Question 11

Variations in lipid compostion of the cell membrane is a result of ?

Answer 11

Adaptations to specific environmental conditions

Question 12

What binds to molecules and change shape to shuttle them across a membrane?

Answer 12

Carrier proteins

Question 13

What is the diffusion acros a membrane with no energy investment?

Answer 13

Passive transport

Question 14

Substances diffuse__ the concentration gradient

Answer 14

Down

Question 15

Osmosis

Answer 15

The diffusion of water across a selectively permeable membrane

Question 16

Tonicity

Answer 16

Ability of a surrounding solution to cause a cell to gain or lose water