AP Biology Cell Membranes Tuff!

Front

What happens to the membranes of hibernating animals during winter?

Back

Membranes toughen as more saturated fatty acids accumulate in them.

Front

What compounds in biological membranes form a barrier to the movement of hydrophilic materials?

Back

Lipids.

Front

What are biological membranes primarily composed of?

Back

Lipids.

Front

What occurs when a mouse cell and a human cell are fused?

Back

The membrane proteins of the two cells become uniformly distributed over the surface of the hybrid cell because many proteins can move around within the bilayer.

Front

Which type of membrane protein is most easily removed in a laboratory experiment?

Back

Peripheral membrane proteins.

Front

What is the role of lipids in biological membranes?

Back

Lipids form a hydrophobic barrier that prevents the movement of hydrophilic substances.

Front

What is the fluid mosaic model of cell membranes?

Back

The fluid mosaic model describes the structure of cell membranes as a mosaic of various proteins that float in or on the fluid lipid bilayer.

Front

What is the difference between integral and peripheral membrane proteins?

Back

Integral membrane proteins are embedded within the lipid bilayer, while peripheral membrane proteins are attached to the exterior or interior surfaces of the membrane.

Front

How do saturated fatty acids affect membrane fluidity?

Back

Saturated fatty acids decrease membrane fluidity because they pack tightly together.

Front

What is the significance of membrane protein mobility?

Back

The mobility of membrane proteins allows for dynamic interactions and functions, such as signaling and transport.