FINAL cell membrane Flashcards
what technique was used to determine the current model of the cell membrane
freeze fracture
a cell membrane is (how permeable)
semi permeable
t/f animal cells have a cell wall that is formed outside the membrane
false
t/f two halves of the plasma membrane are identical
false
the_____ model of membrane structure has two components, lipids and proteins, and is widely accepted at this time
fluid-mosaic
___, ___, ____ are lipids in the plasma membrane
phospholipids, glycolipids, cholesterol
what three factors are responsible for membrane fluidity?
length of tails, type of tails, cholesterol
plasma membrane proteins involved in both passive and active transport
transporters
t/f the cell membrane is highly permeable to all ions
false
molecules cross the plasma membrane
actively and passively
(2) are needed to transport molecules against their concentration gradient
transporter proteins and expenditure of energy
the sugar coating on the surface of cells is due to
glycoproteins and glycolipids
the electrical and chemical attraction an ion has to cross a membrane in a particular direction
ion channeling
four types of membrane proteins
receptors, transporters, linker/anchor, enzyme
type of membrane transport protein which forms an aqueous pore and is involved in passive transport
channel protein
what is the charge on the inside of the cell was during resting membrane potential
negative
what is the charge of the outside of the cell wall during the action potential
negative
what protein allows for cells to return to the resting membrane potential
sodium/potassium pump
what ions are transported by the sodium/potassium pump
Na+ K+
the active transport process which is initiated by the binding of a ligand to a receptor
phagocytosis
movement of molecules from an area of greater concentration to an area of lesser concentration
diffusion
movement of water from an area of greater concentration to an area of lesser concentration
osmosis
list glucose, Na+, H2O, oxygen in order of decreasing membrane permeability
oxygen, H2O, glucose, Na+
sample of cells is placed in a salt solution, they shrink and the membrane is distorted, the solution is probably
hypertonic
component of a cell membrane that is likely to function as a receptor in cell to cell signaling
proteins
bringing nutrient containing particles in from the outside of the cell, and the oopposite
endocytosis and exocytosis
___ part of cell is a barrier, ___ determines specific functions
lipids, proteins
when a cell is placed in a hypotonic solution
water enters the cell toward the higher particle concentration and it swells up
when a cell is placed in a hypertonic solution
the water exits the cell and it shrivels up
a phospholipid molecule has a head and two tails, the tails are found
in the interior of the cell membrane
phospholipids arrange themselves in
a double layer in the presence of water
t/f dna is found in the cell membrane
false
t/f the cell membrane is involved in dna replication
false
is endocytosis a type of active or passive transport
active
an animal cell placed in a hypotonic solution will
take on water
are Na+/K+ pump, endocytosis, and exocytosis active or passive transport
active
active transport requires
energy
can solutions with the same concentration of different solutes have different osmotic pressures
no
how are solutions classified according to their comparartive tonicity
hypotonic and hypertonic
what are the three basic constituents of the cell membrane
lipids, proteins, carbs
(permeability) what type of membrane is the cell membrane
selectively permeable
