The selectively permeable phospholipid bilayer (a.k.a plasma membrane) is 'selectively permeable' because it selects which molecules it allows to permeate (pass through).
In the field of biology Semipermeable and Selectively Permeable refer to what substances the cell membrane allows to permeate (cross) into and out of the cell. The two terms can be used interchangeably.
the ability to allow materials to cross a membrane
A membrane that lets some substances pass through but not others is known as a semipermeable membrane. Other terms that describe this type of membrane are: selectively permeable, partially permeable, or differentially permeable.
There is no single-word opposite of "permeate," which means to spread throughout an area or to pass through a membrane.
The plasma membrane is selectively permeable because it needs to allow certain things in and certain things out.The plasma membrane is a selectively permeable membrane as it allows the entry and exit of some selected substances only.
A selectively permeable membrane
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A selectively permeable membrane allows some substances through it and does not allow others.Allows certain substances to pass but not others
a dialysis membrane is selectively permeable, it is used in experiments to simulate cellular membranes, and it is permeable to water but not to sucrose.
It can permeate some stuff but not everything
Only the water can enter into the bag and leave the bag, the tea leaves can not leave the bag.