cell membrane test 4 Flashcards
phospholipid function
maintain barrier between the cell and its external enviroment
parts of phospholipid
a polar hydrophillic head and non polar hydro phobic tails
what is a peripheral protein
attaches to integral protein or lipids bilayer and is not embedded
what s the function of a peripheral protein
cell to cell communication
what are intergral proteins
proteins that are emmbedded into the cell membrane
what are examples of integral proteins
any transport proteins
what are channel proteins
a protein that helps molecules pass through
what type of transport is channel protein
facilitated diffusion
does the use of channel proteins require energy
no
what are carrier proteins
a protein that helps move thing in and out of the cell with energy
what is needed for a carrier protein
atp
what is a glycoprotein
protein with a carb attached
what are the functions of glycoprotein
transport, cell attechement, regognition , lubricant and protective agent
where does the carb of the glycoprotein go
on the outside
what is an isotonic solution
a solution with the same concentration inside and outside the cell
how does water flow with a cell in a isotonic solution
it flows evenly in and out
what is a plant cell inside an isotonic solution
flacid
what is a hypertonic solution
a solution with a higheer concentration outside than inside the cell
how does water flow insdie the cell with an hypertonic solution
it flows out of the cell
what would happen to a cell in aq hypertonic solution
the cell membrane would shrink and shrivel
where is water or solution stored in a plant
central vacuole
what is a plant cell in a hypertonic solution
plasmalyzed
what is a hypotonic solution
a solution that has a lower concentration of solutes than inside the cell
where does water flow in an hypottonic solution
it flows inside the cell
what happens when a lot of water flows into a animal cell
the membrane ruptures and the cell lyses
what heppens when a lot of water flows into the plant cell
it dosent lyse but it expands a little and the central vacuole expands
why dosent a plant cell lyse with too much water
cell wall
what is a plant cell with a hypotonic solution
turgid
what is diffusion
movement of solutes for high to low concentration
does diffusion re quire energy
no
what molecues can diffuse
oxygen and carbon dioxide etc
what is osmosis
movement of water from high to low concentration
what is the universal solvent
water
what does water follow in osmosis
the higher concentration of solutes
what is facilitated diffusion
movement of larger molecules from high to low concentration with a membrane protein
does facilitated diffusion require energy
no
why cant most proteins pass through membrane
they are too large
how to amino acids pass through the membrane
with help from channel protein
how do carbs pass through the membrane
the monomer can but not the polymers
what are two variables for membrane travel
size and concentration
what is active transport
movement of molecules from low to high concentraion witha membrane protein
what does active transport require
energy
how does alt enter or exit a cell
protein
how does glucose enter and exit the cell
chennel protein
what does more solutes mean
lower amount of water
how many layers of phospholipids are there
2
how does the pracrmecium retain homeostasis
pumps out water
what type of solution is the paramecium pumping
hypotonic
what doe sthe contractile vacuole do
pump water os it does not lyse
