When the concentrations of solutions are the same on both sides of a membrane The two solutions are?
Chapter 7 Vocabulary Practice
|equilibrium||when the concentration of solute is the same throughout|
|osmosis||the diffusion of water through a selectively permeable membrane|
|isotonic||when the concentration of two solutions is the same|
|hypertonic||when comparing two solutions, the solution with the greater concentration of solutes|
Are both sides of a membrane the same?
Membrane surfaces have asymmetry — different characteristics on the two sides. There are differences in lipid composition between the sides of a membrane. Different catalytic proteins (enzymes) appear on the two sides of membranes. Carbohydrate is mostly on the outer surface of cell membranes.
What happens when molecules diffuse across the cell membrane?
Passive transport This takes place when molecules diffuse across the cell membrane by travelling through specific transport proteins. It occurs down a concentration gradient – molecules move from an area of high to lower concentration. This does not require a supply of energy because diffusion is a spontaneous process.
Can materials diffuse through a membrane in both directions at the same time?
How is the dialysis membrane like cell membrane? Can materials travel through a membrane in both directions at the same time? yes because when molecules diffuse in and out of the cell at the same rate, it’s called a isotonic solution. What happened to the cell membrane when the salt was added?
What happens when the concentration of molecules on both sides of a membrane is the same?
During diffusion, when the concentration of molecules on both sides of a membrane is the same, the molecules will continue to move across the membrane in both directions. 2. An animal cell that is surrounded by fresh water will burst because the osmotic pressure causes water to move into the cell.
What happens if the membrane breaks?
If the plasma membrane ruptures or breakdown then the cell will not be able to exchange material from its surrounding by diffusion or osmosis because it acts as a mechanical barrier. Thereafter, the protoplasmic material will be disappeared and the cell will die.
What kind of proteins go all the way through the bilayer?
Some stick only partway into the membrane, while others stretch from one side of the membrane to the other and are exposed on either side 1start superscript, 1, end superscript. Proteins that extend all the way across the membrane are called transmembrane proteins.
What is another name for integral proteins?
Integral membrane proteins, also called intrinsic proteins, have one or more segments that are embedded in the phospholipid bilayer. Most integral proteins contain residues with hydrophobic side chains that interact with fatty acyl groups of the membrane phospholipids, thus anchoring the protein to the membrane.
Does Cholesterol make membrane more or less fluid?
Depending on the temperature, cholesterol has distinct effects on membrane fluidity. At high temperatures, cholesterol interferes with the movement of the phospholipid fatty acid chains, making the outer part of the membrane less fluid and reducing its permeability to small molecules.
Why does cholesterol lower membrane permeability?
Cholesterol reduces permeability of lipid membranes. Cholesterol helps to restrict the passage of molecules by increasing the packing of phospholipids. Cholesterol can fit into spaces between phospholipids and prevent water-soluble molecules from diffusing across the membrane.
Does cholesterol increase the fluidity of the membrane?
The double bond increases fluidity. Membrane fluidity is also affected by cholesterol. Cholesterol can make the cell membrane fluid as well as rigid.
Do proteins affect membrane fluidity?
Membrane proteins are mobile in the lipid fluid environment; lateral diffusion of membrane proteins is slower than expected by theory, due to both the effect of protein crowding in the membrane and to constraints from the aqueous matrix. Lipids may induce the optimal conformation for catalytic activity.