Chapter 7 - Membrane Structure and Function

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.

Phospholipids

________ 'capacity to create membranes is built into their molecular structure.

Membranes

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

mosaic model

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

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.

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.