Cell Membrane and Transport

Front

What is passive transport?

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, relying on concentration gradients.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane using energy, typically against a concentration gradient.

Front

How do cells maintain homeostasis?

Back

Cells maintain homeostasis by regulating what enters and leaves the cell, ensuring a stable internal environment.

Front

What role does cholesterol play in the cell membrane?

Back

Cholesterol helps to stabilize the cell membrane's structure and fluidity, making it less permeable to very small water-soluble molecules.

Front

What is the function of the cell membrane?

Back

The cell membrane acts as a protective barrier, controlling the movement of substances in and out of the cell.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance across a space, which drives the movement of molecules.

Front

What happens when the concentration gradient is gone?

Back

When the concentration gradient is gone, molecules stop moving across the membrane because there is no net movement.

Front

What is exocytosis?

Back

Exocytosis is the process by which a cell expels materials in vesicles that fuse with the cell membrane.

Front

What is endocytosis?

Back

Endocytosis is the process by which a cell takes in materials by engulfing them in a vesicle.

Front

What are cell organelles?

Back

Cell organelles are specialized structures within a cell that perform distinct processes, such as energy production and protein synthesis.