The Cell Membrane Class Notes .pdf, Exercises of Cellular and Molecular Biology

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The Cell Membrane

The fluid mosaic model states that a membrane is a fluid structure with a “mosaic” of various proteins embedded in it.

Most of the lipids, and some proteins, drift laterally. Most of the lipids, and some proteins, drift laterally Rarely does a molecule flip-flop transversely across the membrane.

Lipid Bilayer

Membrane Proteins

Peripheral proteins are bound to the surface of the membrane. Integral proteins penetrate the hydrophobic core Integral proteins that span the membrane are called transmembrane proteins

Types of Membrane Proteins

Transport Proteins: Aquaporin

Diffusion

Tonicity

Osmoregulation

Osmoregulation, the control of solute concentrations and water balance, is a necessary adaptation for life in such environments

Carrier Proteins- Facilitated

Diffusion

Other transport proteins, called carrier proteins,

bind to molecules and change shape to shuttle

them across the membrane.

A transport protein is specific for the substance it

moves