Cell Transport

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, without the use of energy.

Front

What role does the cell membrane play in maintaining homeostasis?

Back

The cell membrane controls what substances may enter or leave the cell, thus helping to maintain homeostasis.

Front

What is active transport?

Back

Active transport is the movement of substances across a cell membrane against their concentration gradient, requiring energy (usually in the form of ATP).

Front

True or False: Large molecules can pass through the cell membrane without assistance.

Back

False. Large molecules and ions require protein channels to pass through the cell membrane.

Front

What happens to an egg placed in pure water for 48 hours?

Back

The egg will gain water and swell due to osmosis.

Front

Define 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.

Front

What is the difference between passive and active transport?

Back

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

Front

What are protein channels?

Back

Protein channels are integral membrane proteins that facilitate the transport of specific substances across a cell membrane.

Front

What is the significance of concentration gradients in cell transport?

Back

Concentration gradients drive the movement of substances during passive transport, as molecules move from areas of higher concentration to areas of lower concentration.

Front

What is endocytosis?

Back

Endocytosis is a process by which cells engulf substances from their external environment, bringing them into the cell.