Membranes and Cell Transport

Front

What is the process called when water diffuses across a membrane?

Back

Osmosis

Front

Why are diffusion and osmosis important for cells?

Back

They allow cells to take in materials without using energy.

Front

What type of transport requires an input of energy?

Back

Active Transport

Front

What is responsible for transporting large or charged (polar) molecules across the cell membrane?

Back

Transport proteins (e.g., channel proteins, carrier proteins).

Front

How do cells take in large particles that cannot pass through the cell membrane?

Back

Endocytosis.

Front

What is the difference between passive transport and active transport?

Back

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

Front

What is facilitated diffusion?

Back

A process where transport proteins help move substances across a cell membrane without using energy.

Front

What role do cell membranes play in transport?

Back

Cell membranes regulate the movement of substances in and out of the cell, maintaining homeostasis.

Front

What is the concentration gradient?

Back

The difference in concentration of a substance across a space, which drives diffusion.

Front

What is exocytosis?

Back

The process by which cells expel materials in vesicles that fuse with the cell membrane.