Membrane Proteins

Question 1

State the primary function of the cell membrane

Answer 1

The cell membrane is semi permeable and controls what goes in and out of the cell

Question 2

Receptor Proteins

Answer 2

communicate signals between the cell’s internal and external environments (EX: Insulin Receptor Protein)

Can be integral or peripheral

Question 3

Transport Proteins

Answer 3

move ions and molecules across the membrane (Ex: Aquaporin tranports water)

Question 4

Enzyme Proteins

Answer 4

Promote chemical reactions that synthesize or break apart biological molecules.

Can be integral or peripheral

Question 5

Adhesion Proteins

Answer 5

Anchors the cell membrane to the inner cytoskeleton or proteins outside the cell as well as to other cells.

(EX: Cadherin)

Can be integral or peripheral

Question 6

Recognition Proteins

Answer 6

Serve as identification tags on the surface of a cell. Often times these are glycoproteins (EX: MHC proteins)

Can be integral or peripheral

Question 7

Channel Proteins

Answer 7

-Serve as pores/tunnels for large or hydrophilic molecules to be passively transported into or out of the membrane
(High to Low) (EX: Glucose channel protein.)

ALL are integral

Question 8

Passively

Answer 8

NO energy required

Question 9

Glycoproteins

Answer 9

Proteins with a attached sugar molecules

Question 10

Pump Proteins

Answer 10

Are used for active transport of molecules (From low to high)

ALL are integral