Cell Membrane & Cell Transport

Front

What is the function of the cell membrane?

Back

The cell membrane controls the passage of materials in and out of the cell, maintaining homeostasis.

Front

Define osmosis.

Back

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

Front

What is active transport?

Back

Active transport is the process of moving particles against their concentration gradient, requiring energy (ATP) to do so.

Front

What is endocytosis?

Back

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

Front

What is exocytosis?

Back

Exocytosis is the process by which cells expel materials to the outside environment, often using vesicles.

Front

Where are carbohydrates found in the plasma membrane?

Back

Carbohydrates are typically found on the outside of the plasma membrane, where they play a role in cell recognition.

Front

What is the lipid bilayer?

Back

The lipid bilayer is a double layer of phospholipids that makes up the cell membrane, providing a barrier to most water-soluble substances.

Front

What role do protein receptors play in the cell membrane?

Back

Protein receptors in the cell membrane bind to specific molecules (ligands) and initiate a cellular response.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process of passive transport of molecules across a membrane via specific transmembrane proteins.

Front

What is the difference between passive transport 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 gradient.