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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.
Are the rates of absorption and diffusion constant for all molecules?
no, the rates are different depending on the size of the molecule, the permeability of the membrane, the concentration gradient etc etc.
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.
Which two factors of the molecule determine whether or not it can cross the membrane?
size and shape. cell membranes are selectively permeable, so only some molecules can get through. (i.e. water can go through, but starch cant) Polarity and size.
What two factors of a molecule determine whether or not cross the membrane?
size and shape. cell membranes are selectively permeable, so only some molecules can get through. (i.e. water can go through, but starch cant) Polarity and size.
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.
Are the rates of absorption and diffusion constant for all molecules?
no, the rates are different depending on the size of the molecule, the permeability of the membrane, the concentration gradient etc etc.
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 the six factors that influence the permeability of a cell membrane?
There are three factors that determine the permeability of a cell's membrane: 1. Total number of channels available 2. Conductance - how well an ion passes through the channel 3. How long the channels are open
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 is the main factors that influences membrane permeability?
The best answer here is probably polarity but size is the second runner up.
How a particular molecule crosses the membrane depends in part on the molecule's size true or false?
true
What is a factor that determines if a molecule can cross a cell membrane?
size/ polarity can be the factors
Which is a factor that determines wether a molecule can cross the cell membrane?
Polarity
Which two factors of the molecule determine whether or not it can cross the membrane?
size and shape. cell membranes are selectively permeable, so only some molecules can get through. (i.e. water can go through, but starch cant) Polarity and size.
What are the two characteristics of a molecule that will keep it from passing through a membrane and how does each keep the molecule from passing through?
size and polarity
