Chapter 7 - Membrane Structure and Function

Diffusion of one solute

The term refers to the membrane that has pores large enough for molecules of dye to pass through.

Nonpolar substances

, such as hydrocarbons, CO2, and O2, as well as lipids, are hydrophobic.

land dwelling

Most terrestrial () animals 'cells are immersed in an extracellular fluid that is isotonic to the cells.

hydrophobic core

However, the of the membrane prevents ions and polar molecules that are hydrophilic from passing directly through the membrane.

Protein groups

are frequently found in long-lasting, specialized patches where they perform similar activities.

Membranes

are mostly composed of lipids and proteins, however, carbohydrates play a significant role as well.

amphipathic molecule

The term phospholipid refers to a(n) , meaning it has both a hydrophilic " (water- loving) "region and a hydrophobic ("water- fearing) "region.

phospholipid bilayer

A(n) can exist as a stable boundary between two aqueous compartments because the molecular arrangement shelters the hydrophobic tails of the phospholipids from water while exposing the hydrophilic heads to the water.

mosaic model

The fluid , like other models, is always being improved as new research reveals more about membrane structure.

plasma membrane

The , like other biological membranes, has selective permeability, which means that certain chemicals may pass it more easily than others.

flexible cell

A cell with walls can not withstand high water absorption or loss.

hydrophobic core

A charged atom or molecule and its surrounding water shell are much less likely to enter the mem's .

Phospholipids

are the most prevalent lipids in most membranes.