Asked Nov 10, 2019

Microbology-How do molecules move in and out of cells?


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Step 1

A Cell is surrounded by a membrane called cell membrane which is made up of lipids, proteins and carbohydrates. The general structure of a cell membrane is a lipid bilayer with different proteins and carbohydrates and other molecules like cholesterol anchored or embedded in it.

Step 2

A cell membrane is semi-permeable and allows only small and non-polar (such as O2, CO2, urea, water) molecules to diffuse through it. Transport of large, charged and polar molecules require some channel proteins or carrier proteins.

Channel proteins acts like gate th...

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