Chapter 7- Cell Membrane_23

Front

What are channel proteins?

Back

Channel proteins are integral membrane proteins that form tunnels across the membrane, allowing specific substances to pass through.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that allows substances to cross membranes with the assistance of special proteins.

Front

What is the function of the Na/K pump?

Back

The Na/K pump moves sodium (Na) and potassium (K) ions across the membrane at a ratio of 3 Na ions out for every 2 K ions in.

Front

What is the hydrophilic portion of the cell membrane?

Back

The hydrophilic portion of the cell membrane is the part that is attracted to water, typically composed of phosphate heads in phospholipids.

Front

What role do glycoproteins play in the plasma membrane?

Back

Glycoproteins are responsible for cell recognition and communication, acting as markers on the cell surface.

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, relying on concentration gradients.

Front

What is the difference between simple diffusion and facilitated diffusion?

Back

Simple diffusion is the movement of small or nonpolar molecules directly through the membrane, while facilitated diffusion requires specific transport proteins.

Front

What are integral membrane proteins?

Back

Integral membrane proteins are proteins that are permanently attached to the biological membrane and can span across the membrane.

Front

What is the structure of the cell membrane?

Back

The cell membrane is primarily composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.