Unit 2: Cells- membrane proteins

Question 1

why proteins work in the membrane?

Answer 1

they are both polar and nonpolar (hydrophobic and hydrophilic), just as the membrane is

Question 2

peripheral proteins in cell membrane

Answer 2

just bound to the outside of the membrane and float around

Question 3

integral proteins

Answer 3

puncture into the phospholipid bilayer

• hydrophobic parts bound inside
• hydrophilic parts stick out

also called “transmembrane proteins”

Question 4

6 functions of membrane proteins

Answer 4

1. signal transduction
2. cell recognition
3. attachment to cytoskeleton and ecm
4. cell signaling
5. transport molecules in and out of membrane
6. cell-cell attachment