Cell Membranes and Transport _ S4

Front

What is a characteristic feature of a carrier protein in a plasma membrane?

Back

It exhibits specificity for a particular type of molecule.

Front

What is the process of using energy to transport large molecules out of the cell in a vesicle called?

Back

Exocytosis.

Front

What type of molecule is involved in facilitated diffusion?

Back

Protein.

Front

In which direction will red food coloring diffuse when dropped into one side of a glass of water?

Back

To the right.

Front

According to the fluid mosaic model of cell membranes, what can phospholipids do?

Back

They can shift laterally along the plane of the membrane.

Front

Define diffusion.

Back

The movement of molecules from an area of higher concentration to an area of lower concentration.

Front

What is facilitated diffusion?

Back

A process that allows substances to cross membranes with the assistance of special proteins.

Front

What role do proteins play in the cell membrane?

Back

They assist in transport, act as receptors, and provide structural support.

Front

What is the function of the sodium-potassium pump?

Back

To transport sodium out of the cell and potassium into the cell, using energy.

Front

What is endocytosis?

Back

The process of taking in large molecules by engulfing them in a vesicle.