Biology Honors: Ch 3B Cell Membrane Structure & Function

Front

What is the ideal tonicity for a plant cell?

Back

Hypotonic

Front

How does a cell maintain homeostasis?

Back

By regulating what enters and leaves the cell.

Front

What is the concentration of solute in an isotonic solution compared to inside the cell?

Back

Equal concentration.

Front

What are the two parts of a phospholipid called?

Back

Hydrophilic Head and Hydrophobic Tail.

Front

What type of transport uses channel proteins to help molecules move from higher to lower concentrations?

Back

Facilitated Diffusion.

Front

What is the function of the cell membrane?

Back

To protect the cell and regulate the movement of substances in and out.

Front

Define osmosis.

Back

The movement of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy, while active transport requires energy to move substances against their concentration gradient.

Front

What role do proteins play in the cell membrane?

Back

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

Front

What is a concentration gradient?

Back

A difference in the concentration of a substance across a space.