Answer :

Natural membranes like the cell membrane is selectively permeable, which means that it allows only certain molecules to get in or go out of the cell. This prevents random molecules from getting in like toxins which would otherwise be harmful for the cell.

Example of a cell membrane is where it allows only non-polar and small molecules through the lipid bilayer along the concentration gradient. To move other important molecules, it needs either energy (active transport) against the concentration gradient or needs aid from proteins like carrier and channel proteins that facilitate the movement of other specific molecules along the concentration gradient.


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses

Halophytes may shBiology - Exemplar

Define Uniport, SBiology - Exemplar

Comment on the exBiology - Exemplar

Why are natural mBiology - Exemplar

The radio labelleBiology - Exemplar

Plants show tempoBiology - Exemplar

Minerals are presBiology - Exemplar

How is facilitateBiology - Exemplar

We know that planBiology - Exemplar

Observe the diagrBiology - Exemplar