Protein Components

What are the two main types of proteins found in the cell membrane?

Intrinsic and extrinsic proteins.

What characterizes intrinsic proteins?

They span the membrane from one side to the other.

Where are extrinsic proteins located?

They are found on one side of the bilayer or on the surface of the bilayer.

What role do some intrinsic proteins serve in the cell membrane?

They form channels through the membrane.

How is the orientation of hydrophilic and hydrophobic portions of proteins determined?

It depends on the location of the R group in the primary sequence.

Where are hydrophilic parts of proteins typically located in relation to phospholipid heads?

They are located around the phospholipid heads or on the outside.

In relation to the hydrophobic tails, where are hydrophobic portions with non-polar R groups found?

They are arranged near/between the hydrophobic tails.

What types of R groups line the channels of channel proteins?

Charged/polar R groups.