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3.4.3 Proteins as the Mosaic of the Cell Membrane

front 1

In what ways do the various membranes of a eukaryotic cell differ?

1. Different eukaryotic cell membranes contain different transport and receptor proteins.

2. Some eukaryotic cell membranes do not contain hydrophobic regions.

3. Some eukaryotic cell membranes are not selectively permeable.

4. Some eukaryotic cell membranes do not contain phospholipids.

back 1

1. Different eukaryotic cell membranes contain different transport and receptor proteins.

front 2

A protein that has both hydrophobic and hydrophilic regions that resides in a cell membrane would be an

back 2

integral protein.

front 3

True or False?

All membrane proteins transect the membrane.

back 3

False

Not all membrane proteins transect the membrane. Some are bound only to the surface of the membrane (peripheral proteins), while others may partially transect the membrane, or be fully embedded in the lipid region of the membrane.

front 4

True or False?

Peripheral proteins can be exposed to the cytosol or to the extracellular environment, cannot be transmembrane proteins, and are bound to the hydrophilic side of the membrane.

back 4

True

front 5

A protein-oligosaccharide molecule in a plasma membrane functions

1. to bind cells together.

2. as an enzyme.

3. as a transport molecule.

4. in cell-cell recognition.

back 5

4. in cell-cell recognition.

front 6

The following amino acid is more likely to be found in the region of a membrane protein that is within the plasma membrane is

back 6

leucine

front 7

Proteins formed on the rough ER may end up in the ___________ __________.

back 7

plasma membrane

front 8

The ___________ __________ packages proteins that are either
enclosed or on the surface of vesicles

back 8

Golgi apparatus

front 9

Integral proteins also called _________ ____________
are incorporated into the cell membrane

back 9

trans-membranal proteins,