Fluid Mosaics

Question 1

Membranes are..

Answer 1

“Fluid mosaics”

Question 2

What is a fluid mosaic?

Answer 2

proteins move within layers of fluid phospholipids

Question 3

What is FLUID about the phospholipid bilayer?

Answer 3

-Phospholipid bilayer is flexible allowing for changes in the cellular shape

Question 4

What is FLUID about membrane lipids (and some proteins?

Answer 4

-Membrane lipids (and some proteins) can drift laterally within the membrane

Question 5

What is FLUID about individual phospholipid molecules?

Answer 5

individual phospholipid molecules are not bonded to one another

Question 6

What is FLUID about proteins in comparison to lipids?

Answer 6

Proteins drift move slowly than lipids

Question 7

What is FLUID about some membrane proteins?

Answer 7

some membrane proteins are tethered to the cytoskeleton and cannot move far

Question 8

Wy are membranes called a (fluid) MOSAIC??

Answer 8

A mosaic of proteins is embedded into the membrane

Question 9

Peripheral proteins

Answer 9

• protein is not embedded. It is attached to one surface of the membrane
• Attach only temporarily to cell membrane and sometimes attach to integral proteins

Question 10

Integral proteins

Answer 10

• Protein spans the entire membrane (EX: Transmembrane)

- Permanently attached to cell membrane