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Does the size or the speed of a molecule determines whether it can pass through the pores of a membrane?
The speed doesn't necessarily determine the permeability, but the size does. Smaller molecules such as O2 can easily enter the cell while CO2 leaves the cell. There are other criteria that also determines whether a molecule can pass through the plasma membrane such as its solubility. Fat soluble molecules such as steroids can easily pass through the membrane.
What are two factors that determine whether or not molecules can pass through a selectively permeable membrane?
One factor is the channel of the molecule, without them the ions and polar molecules would not be able to pass across. Another factor is the size of the molecule, they determine how fast it will defuse.
What are facts about permeability?
Permeability refers to the ability of a material to allow fluids or gases to pass through it. It is influenced by factors such as the size of the pores in the material, the composition of the material, and the pressure applied. Permeability is an important property in various fields such as geology, engineering, and biology.
What best determines whether a molecule crosses a cell membrane?
The ability of a molecule to cross a cell membrane is primarily determined by its size, polarity, and charge. Small, nonpolar molecules, such as oxygen and carbon dioxide, can easily diffuse through the lipid bilayer. In contrast, larger or polar molecules often require specific transport proteins or channels to facilitate their passage. Additionally, the concentration gradient and the presence of membrane proteins can further influence a molecule's permeability.
Are the rates of absorption and diffusion constant for all molecules?
No, the rates of absorption and diffusion are not constant for all molecules. They depend on factors like molecular size, charge, solubility, and membrane permeability. Larger molecules, charged molecules, and less lipid-soluble molecules typically have slower rates of absorption and diffusion compared to smaller, uncharged, and lipid-soluble molecules.
What feature of a membrane describes whether molecules can cross the membrane?
permeabiity
What does permeability depend on?
Permeability depends on membrane solubility and the presence of specific integral transport proteins. Other factors such as pressure, concentration, and temperature of the molecules or solutes on either side, as well as the size of the molecules can also affect permeability.
Does the size or the speed of a molecule determines whether it can pass through the pores of a membrane?
The speed doesn't necessarily determine the permeability, but the size does. Smaller molecules such as O2 can easily enter the cell while CO2 leaves the cell. There are other criteria that also determines whether a molecule can pass through the plasma membrane such as its solubility. Fat soluble molecules such as steroids can easily pass through the membrane.
What are two factors that determine whether or not molecules can pass through a selectively permeable membrane?
One factor is the channel of the molecule, without them the ions and polar molecules would not be able to pass across. Another factor is the size of the molecule, they determine how fast it will defuse.
What structure allows only certain things to pass in and out of a cell?
The cell membrane. It is a semi-permeable membrane (or selectively permeable membrane) - this means that it only lets certain certain molecules or ions pass in or out of the cell. Permeability may depend on the molecule's size, solubility, properties, or chemistry.
What are facts about permeability?
Permeability refers to the ability of a material to allow fluids or gases to pass through it. It is influenced by factors such as the size of the pores in the material, the composition of the material, and the pressure applied. Permeability is an important property in various fields such as geology, engineering, and biology.
What is membrane permeability?
Membrane permeability refers to the ability of molecules, substances, etc. to pass through the membrane. For example, the cell membrane is referred to as 'semi-permeable' because it allows some molecules (such as water) to enter, and stops other molecules (such as sodium ions) from passing through the membrane. If these want to get into the cell, they must then rely on proteins in the cell membrane to let them in.
What best determines whether a molecule crosses a cell membrane?
The ability of a molecule to cross a cell membrane is primarily determined by its size, polarity, and charge. Small, nonpolar molecules, such as oxygen and carbon dioxide, can easily diffuse through the lipid bilayer. In contrast, larger or polar molecules often require specific transport proteins or channels to facilitate their passage. Additionally, the concentration gradient and the presence of membrane proteins can further influence a molecule's permeability.
What is the main factors that influences membrane permeability?
The best answer here is probably polarity but size is the second runner up.
Are the rates of absorption and diffusion constant for all molecules?
No, the rates of absorption and diffusion are not constant for all molecules. They depend on factors like molecular size, charge, solubility, and membrane permeability. Larger molecules, charged molecules, and less lipid-soluble molecules typically have slower rates of absorption and diffusion compared to smaller, uncharged, and lipid-soluble molecules.
What are the factors that determine selective permeability?
Selective permeability is determined by several factors, such as the size of molecules or ions, their charge, lipid solubility, presence of specific transport proteins or channels, and the concentration of substances on either side of the membrane. The lipid bilayer itself contributes to selective permeability due to variations in thickness and composition, allowing some substances to pass through while blocking others. Additionally, membrane proteins like transporters and channels play a crucial role in regulating the passage of specific molecules or ions across the membrane.
Molecules A and B are both organic molecules found in many cells when tested it is found that molecule A cannot pass through a cell membrane but molecule B easily passes through state one way the two?
Molecule A may be too large or too polar to pass through the cell membrane effectively, while molecule B may be smaller and more nonpolar allowing it to pass through easily via diffusion. The difference in membrane permeability between the two molecules could be due to variations in size, charge, polarity, or interaction with membrane proteins.
