Roles of Membrane Bound Proteins

Question 1

Receptor Proteins

Answer 1

Receptor proteins each type binds to a specific molecule found outside the cell (like a hormone) which triggers a change inside the cell, or a cell action.
Can be integral/peripheral

Question 2

Enzyme Proteins

Answer 2

Enzyme proteins promote chemical reactions that synthesize or break apart biological molecules.
Can be either integral or peripherial.

Question 3

Adhesion Proteins

Answer 3

Adhesion proteins Anchors the cell membrane to the inner cytoskeleton or proteins outside the cell as well as to other cells.
Can be integral or peripheral.

Question 4

Recognition Proteins

Answer 4

Recognition proteins Serve as identification tags on the surface of a cell.
Often times these are glycoprotiens (proteins with an attached sugar molecule)
Can be integral or peripheral.

Question 5

Channel Proteins

Answer 5

Channel Proteins
Serve as pores/tunnels for large or hydrophilic molecules to be passively (no energy required) transported into/out of the membrane
All are integral

Question 6

Pump Proteins

Answer 6

Pump Proteins serve as pores/tunnels for large or hydrophilic molecules to be actively (energy required) transported into/out of the membrane
All are integral