chapter 5 Flashcards
construction and movement through the membrane
plasma membrane
coupling and chemical reactions
energy
catalysts and inhibiting
enzymes
security gate for everything entering and exiting
PM
edge of life
PM
4 components of Pm
phospholipid bilayer
Cholesterol
proteins
glycocalyx
interspersed throughout the phospholipid bilayer
cholesterol
along inside and outside of Pm
proteins
short carbohydrate on outside of PM
glycocalyx
lubricate between cells and allow them to adhere when needed
glycocalx
hydrophilic head faces
outside
hydrohphobic tail faces
towards each other in center
what does selectively permeable mean
only hydrophobic and small molecules can pass through
acts to keep smaller molecules from passing
cholesterol
resists hot and cold temperatures
cholesterol
2 types of proteins
integral and peripheral
binds hydrophobic interior, can pop out on
integral proteins
lie on either side of membrane
peripheral proteins
functions of proteins
structural support
recognition
communication
transport
no energy neeeded
passive transport
drying out or flooding of cells due to osmotic pressure
osmotic imbalance
prevention of water movement used by animals
osmoregulation
solution has lower concentration of solutes than cell
hypotonic
solution has higher concentration of solutes than the cell
hypertonic
cell lyses and swells
hypotonic
cell shrivels
hypertonic
molecules must pass through a transport protein in PM
facilitated diffusion
helps polar or charged molecules move through
facilitated diffusion
water uses
aquaporin
energy is needed to move across PM
active transport
can move cell against concentration gradient
active transport