Cell Membrane & Transports

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane.

Front

What type of cell transport is represented by the process of taking in substances by engulfing them?

Back

Endocytosis.

Front

Describe the movement of molecules through proteins in a cell membrane when moving against the concentration gradient.

Back

Molecules move from a lower concentration to a higher concentration.

Front

What is the structure of the cell membrane?

Back

The cell membrane is made up of a lipid bilayer with hydrophilic heads facing outward and hydrophobic tails facing inward.

Front

What is the primary function of the cell membrane?

Back

To control the movement of substances in and out of the cell.

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 is facilitated diffusion?

Back

Facilitated diffusion is the process of transporting substances across a cell membrane with the help of carrier proteins, moving from high to low concentration.

Front

What role do channel proteins play in cell transport?

Back

Channel proteins provide a passageway for specific molecules to cross the cell membrane, often facilitating passive transport.

Front

What is a selectively permeable membrane?

Back

A selectively permeable membrane allows certain substances to pass through while blocking others.

Front

What is the significance of the hydrophobic and hydrophilic regions in the lipid bilayer?

Back

The hydrophobic tails face inward, creating a barrier to most water-soluble substances, while the hydrophilic heads face outward, interacting with the aqueous environment.