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What would happen if the plasma membrane were composed solely of phospholipids and no proteins?
Wiki User
∙ 16y ago
there would be no protein channels in the plasma membrane and as a result of that there would be no entry or exit of the materials across the membrane
Wiki User
∙ 16y ago
Wiki User
∙ 16y agoThe cell membrane would not be able to regulate its fluidity. Cholesterol keeps the membrane more rigid at high temps. and more fluid at low temps.
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What component of the membrane causes it to have a fluid consistency?
Phospholipids can move within the bilayer but most of the lipids and proteins drift laterally. Flip flopping doesn't happen very often. When temperatures are cool, the fluid state goes to a solid one. Though it stays fluid at lower temperatures if it has lots of phospholipids with unsaturated hydrocarbon tails.
Where does synthesis of membrane proteins and secretory proteins happen?
Synthesis of proteins occurs in the Rough Endoplasmic Reticulum.
What are the advantages of semi permeability in cell membrane?
The membrane acts as a barrier that prevents most things from entering. Small molecules and water can diffuse across the membrane but most proteins and larger molecules cannot. The cell can use this advantage in combination with proteins to decide what gets in, what goes out and when that should happen.
When mixed with water phospholipids spontaneously form membranes. what properties of phospholipids cause this to happen?
Hydrophilic phosphate groups that are attracted to water and hydrophobic fatty acid tails that avoid water.
What side of the membrane does ATP formation happen?
Thylakoid space.
What component of the membrane causes it to have a fluid consistency?
Phospholipids can move within the bilayer but most of the lipids and proteins drift laterally. Flip flopping doesn't happen very often. When temperatures are cool, the fluid state goes to a solid one. Though it stays fluid at lower temperatures if it has lots of phospholipids with unsaturated hydrocarbon tails.
Where does synthesis of membrane proteins and secretory proteins happen?
Synthesis of proteins occurs in the Rough Endoplasmic Reticulum.
What would happen if materials could not move across the cell membrane?
Isolation. And most materials can NOT move across the cell membrane. (For many things your cells have special proteins within the membrane for transport.)
What are the advantages of semi permeability in cell membrane?
The membrane acts as a barrier that prevents most things from entering. Small molecules and water can diffuse across the membrane but most proteins and larger molecules cannot. The cell can use this advantage in combination with proteins to decide what gets in, what goes out and when that should happen.
What happen to a cell during the process of exocytosis?
It reorganizes its cytoskeleton to reposition its secretory vesicles at the plasma membrane. The vesicles then fuse to the plasma membrane using a complex interaction between proteins of the vesicle membrane and proteins of the cell membrane, and a realignment of the lipids of the membranes. This creates a fusion pore, which rapidly expands to expose the vesicle contents to the extracellular milieu. This releases the vesicle contents into the extracellular space.
What would happen to a cell if its membrane burst?
It would depend on the extent of the damage to the cell membrane. If there is only minor damage to the membrane, the cell will produce the necessary proteins, fats and carbohydrates to repair the damage, and work towards returning to homeostasis. If the damage is extensive, the cell will lyse and die, as it is no longer able to maintain homeostasis.
By what process do small molecules move into cells?
Substances both enter and leave the cell by crossing the plasma membrane (outer membrane). They do this in one of the following ways.Substances in solution tend naturally to spread until their concentration is uniform. Many substances enter and leave cells this way, because their concentration on one side of the plasma membrane is different from that on the other side.A few substances cross the phospholipid bilayer, but their molecules have to be small and uncharged: oxygen, carbon dioxide, and water are examples.The diffusion of other substances is facilitated by proteins. One family of such proteins is the channel proteins, which have a pore that allows substances to cross the membrane without interacting with the hydrophobic fatty acid chains of the phospholipids. The cell can open and close the pore. Channel proteins are not truly selective, but molecules must be small enough to pass through the pore, and must be suitably charged if the side-chains of the amino acids around the pore are charged.Another family of membrane proteins that permit facilitated diffusion is the carrier proteins. These change conformation (shape) as a substance moves through them, and they are highly selective.This is like "diffusion uphill", in that it involves substances being moved against (up) their concentration gradient. This cannot happen without an input of energy, which the cell provides, e.g by the hydrolysis of ATP.The plasma membrane acts as a selectively permeable membrane (also known as a semi-permeable or differentially permeable membrane). Water crosses such a membrane if the total concentrations of solutes on either side of the membrane are different.Water can cross the phospholipid bilayer by osmosis. However, some water also crosses through special proteins called aquaporins.
When mixed with water phospholipids spontaneously form membranes. what properties of phospholipids cause this to happen?
Hydrophilic phosphate groups that are attracted to water and hydrophobic fatty acid tails that avoid water.
What is ATP and what role does it play in energy transfers?
ATP IS energy. It makes reactions happen between chemicals that can't happen on their own, like pumping molecules through the cell membrane or helping put together proteins through transcription and translation.
What would happen to a resting membrane potential if the concentration of a large intracellular anions that are unable to cross the membrane experimentally is increased?
If the concentration of large intracellular anions..i.e. proteins, which are unable to cross the membrane due to their large size.. were to increase, the resting potential would reach a more negative state, a deviation from -70mV to a more negative value do to these anions.
What will happen if plasma membrane is ruptures?
lysis
What happen to the portion of the cell membrane that surrounds a large molecules during endocytosis?
it separates from the membrane.
