Week 4 Plasma Membrane Structure and Movement

Question 1

What does Hydrophobic do?

C- form bonds with water/s- water

Answer 1

Can’t

scared

Question 2

What does Hydrophilic do?

Can form bonds with water/l- w-

Answer 2

loves

water

Question 3

What does Hydrophilic heads do?

Form the o- surface facing the c- or e- f-

Answer 3

outer
cytoplasm
extracellular
fluid

Question 4

What does Hydrophobic tails do?

h- i- the m-

Answer 4

hide
inside
membrane

Question 5

What does Fluidity do?

Membrane can change s- without b- apart and p- can move freely r- to one another

Answer 5

shape
breaking
phospholipids
relative

Question 6

What are the movements of phospholipids?

L- (sideways) or f- across (change sides)

Answer 6

Laterally

flipping

Question 7

What does mosaic refer to?

The c- of proteins e- in the membrane. Proteins determine the m- s- functions

Answer 7

collage
embedded
membranes
specific

Question 8

What do Peripheral Proteins do?

They are b- to membrane surface

Answer 8

bound

Question 9

What do Transmembrane integral proteins do?

P- h- core and s- across the membrane

Answer 9

Penetrate
hydrophobic
span

Question 10

What do Plasma membranes do in High Temp?

C- restrains the movement of p-

Answer 10

Cholesterol phospholipids

Question 11

What do Plasma membranes do in Low Temp?

Cholesterol m- fluidity by preventing tight packing of p-

Answer 11

maintains

phospholipids

Question 12

Membrane carbohydrates do?

C- bonded to p- or l-

Answer 12

Covalently
proteins
lipids

Question 13

Movement through phospholipids is?

S- d-

Answer 13

Simple

diffusion

Question 14

Movement through proteins is?

Protein-m- transport

Answer 14

mediated

Question 15

What is membrane potential?

Is the v- a- a membrane

Answer 15

voltage

across

Question 16

What is Aquaporin?

Membrane protein with h- c-

Answer 16

hydrophilic

channel

Question 17

Water Potential measures?

C- of f- water m-

Answer 17

Concentration
free
molecules

Question 18

Water potiental is high when?

Answer 18

Low solute conc.
Free energy is high
Higher concentration of free H2O

Question 19

Water potential is low when?

Answer 19

High solute conc.
Free energy is low
Lower concentration of free H2O

Question 20

What is osmosis?

Answer 20

Osmosis is the spontaneous net movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration

Question 21

What is passive transport?

Answer 21

Passive transport is a movement of ions and other atomic or molecular substances across cell membranes without need of energy input.

Question 22

What is active transport?

Answer 22

active transport is the movement of molecules across a membrane from a region of their lower concentration to a region of their higher concentration—against the concentration gradient.