cell membrane, transport Flashcards
functions of membrane proteins
transport
enzymatic activity
signal transduction- uses signal molecules and reception
passive transport
doesn’t require energy
small molecules
may involve transport proteins
active transport
requires energy (ATP) and transport protein
small molecules
endocytosis
larges molecules taken when plasma membrane pinches inward, forming vesicles
bulk transport
moves large molecules
exocytosis
large molecules secreted when a vesicle fuses with the plasma membrane
hypotonic
too much water
isotonic
normal
hypertonic
shriveled, little to no water
exergonic reaction
energy being released
endergonic reaction
energy required
glycoprotein
carbohydrate + protein
increased temperature on membrane
increases fluidity
increased presence of double bonds
increases fluidity
freely diffusible
more fluid membrane
flip flopping across the membrane
is rare
wall that acts as a selective barrier
plasma membrane
phospholipids can move laterally across the membrane. true or false
true
amphipathic
has both hydrophilic and hydrophobic domains
why does water move quickly through the cell membrane
it moves through aquaporins in the membrane
does not require energy from ATP hydrolysis
facilitated diffusion
the movement of a substance across a biological membrane against its concentration gradient with the
help of energy input is
active transport
Which cellular structure forms a barrier around functional compartments?
Cell membranes
Which molecular components are responsible for this barrier function?
phospholipid bilayer
