Week 4 Plasma Membrane Structure and Movement Flashcards
What does Hydrophobic do?
C- form bonds with water/s- water
Can’t
scared
What does Hydrophilic do?
Can form bonds with water/l- w-
loves
water
What does Hydrophilic heads do?
Form the o- surface facing the c- or e- f-
outer
cytoplasm
extracellular
fluid
What does Hydrophobic tails do?
h- i- the m-
hide
inside
membrane
What does Fluidity do?
Membrane can change s- without b- apart and p- can move freely r- to one another
shape
breaking
phospholipids
relative
What are the movements of phospholipids?
L- (sideways) or f- across (change sides)
Laterally
flipping
What does mosaic refer to?
The c- of proteins e- in the membrane. Proteins determine the m- s- functions
collage
embedded
membranes
specific
What do Peripheral Proteins do?
They are b- to membrane surface
bound
What do Transmembrane integral proteins do?
P- h- core and s- across the membrane
Penetrate
hydrophobic
span
What do Plasma membranes do in High Temp?
C- restrains the movement of p-
Cholesterol phospholipids
What do Plasma membranes do in Low Temp?
Cholesterol m- fluidity by preventing tight packing of p-
maintains
phospholipids
Membrane carbohydrates do?
C- bonded to p- or l-
Covalently
proteins
lipids
Movement through phospholipids is?
S- d-
Simple
diffusion
Movement through proteins is?
Protein-m- transport
mediated
What is membrane potential?
Is the v- a- a membrane
voltage
across
What is Aquaporin?
Membrane protein with h- c-
hydrophilic
channel
Water Potential measures?
C- of f- water m-
Concentration
free
molecules
Water potiental is high when?
Low solute conc.
Free energy is high
Higher concentration of free H2O
Water potential is low when?
High solute conc.
Free energy is low
Lower concentration of free H2O
What is osmosis?
Osmosis is the spontaneous net movement of solvent molecules through a selectively permeable membrane into a region of higher solute concentration
What is passive transport?
Passive transport is a movement of ions and other atomic or molecular substances across cell membranes without need of energy input.
What is active transport?
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.
