Flashcard 010: Cell Membrane and Transport

Front

Why is the cell membrane considered 'fluid'?

Back

The phospholipids can move and recombine, making the membrane flexible.

Front

What is the role of protein pumps in active transport?

Back

They move molecules using ATP energy against their concentration gradient.

Front

Which types of cells have a cell wall in addition to their cell membrane?

Back

Bacteria, fungi, plant, and some protist cells.

Front

What is the Fluid Mosaic Model?

Back

A model explaining the flexible nature of cell membranes.

Front

What happens to the cell membrane under stress?

Back

It can easily 'break,' leading to cell death.

Front

What are phospholipids?

Back

Molecules that make up the cell membrane, consisting of a hydrophilic head and two hydrophobic tails.

Front

What is passive transport?

Back

The movement of molecules across the cell membrane without the use of energy.

Front

What is osmosis?

Back

The diffusion of water molecules across a selectively permeable membrane.

Front

What is the difference between active and passive transport?

Back

Active transport requires energy to move molecules against their concentration gradient, while passive transport does not.

Front

What is a selectively permeable membrane?

Back

A membrane that allows certain molecules to pass through while blocking others.