Which of the following makes up the bilayer of every cell membrane?
Phospholipids
What type of microscope can be used to see the two phospholipid layers in a plasma membrane?
Electron
Identify the four main components of all eukaryotic membranes.
Interior protein network
Cell surface markers
Transmembrane proteins
Lipid bilayer
When phospholipids are placed in water, they spontaneously form a bilayer with which of the following?
The polar heads on the surface and the nonpolar tails in the interior
How does lipid composition affect membrane fluidity?
Sterols, such as cholesterol, can either increase or decrease membrane fluidity depending on temperature.
Saturated fatty acids tend to make the membrane less fluid because they pack together well.
Which of the following makes up the bilayer of every cell membrane?
Cholesterol
Proteins
Saturated fats
Unsaturated fats
Phospholipids
Phospholipids
Compared to the ER membrane, the plasma membrane contains more of which of the following (choose all that apply)?
Phosphatidylcholine
Cholesterol
Sphingomyelin
Which of the following is not one of the four main components of all plasma membranes?
Interior protein network
Transmembrane proteins
Lipid bilayer
Extracellular matrix
Cell surface markers
Extracellular matrix
Although a eukaryotic cell membrane can contain many different lipids, they can be classified in three groups: glycerol phospholipids, ____, and ______.
sphingolipids
sterols
The lack of double bonds in saturated fats allow them to pack together tightly, and therefore the membrane is ______ fluid. The presence of double bonds in unsaturated fats prevent them from packing together tightly, and therefore the membrane is ______ fluid.
less
more
Identify the four main components of all eukaryotic membranes.
Cell surface markers
Transmembrane proteins
Interior protein network
Lipid bilayer
Each membrane-spanning region of a transmembrane protein is called a transmembrane _______.
domain
Due to the constant random motion of its atoms and molecules, a substance will exhibit net movement from a region where it has a higher concentration to a region where it has a lower concentration. This net movement is called _____.
diffusion
In an aqueous solution the solvent is ____.
water
When 10 grams of NaCl are dissolved in 1 L of water, NaCl is called the ___ and water is called the _____.
solute
solvent
An aqueous solution with a lower concentration of solutes will have a ____ concentration of free water molecules.
higher
Which type of transport proteins use energy from ATP indirectly?
Coupled transport proteins
Which type of transport proteins use energy from ATP directly?
Protein Pumps
Which type of transport proteins use energy from ATP indirectly?
Coupled transport proteins
