Cell Membrane and Cell Transport

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy. It relies on the concentration gradient, moving substances from areas of higher concentration to areas of lower concentration.

Front

What is active transport?

Back

Active transport is the movement of substances across a cell membrane that requires energy, usually in the form of ATP. It moves substances against their concentration gradient, from areas of lower concentration to areas of higher concentration.

Front

What is the difference between passive and active transport?

Back

The main difference is that passive transport does not require energy, while active transport does.

Front

What happens to a cell in a hypertonic solution?

Back

In a hypertonic solution, a cell will lose water and shrink because the concentration of solutes outside the cell is higher than inside.

Front

What happens to a cell in a hypotonic solution?

Back

In a hypotonic solution, a cell will gain water and may expand or burst because the concentration of solutes outside the cell is lower than inside.

Front

What is an isotonic solution?

Back

An isotonic solution is one where the concentration of solutes is equal inside and outside the cell, resulting in no net movement of water.

Front

What are the phosphate heads of the lipid bilayer?

Back

The phosphate heads of the lipid bilayer are hydrophilic, meaning they are attracted to water.

Front

What are the hydrophobic tails of the lipid bilayer?

Back

The hydrophobic tails of the lipid bilayer are repelled by water and face inward, away from the aqueous environment.

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.

Front

What is the role of the cell membrane?

Back

The cell membrane regulates what enters and exits the cell, providing protection and support while maintaining homeostasis.