Cell Bio 1

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, requiring chemical energy.

Front

What does the Fluid Mosaic Model describe?

Back

The Fluid Mosaic Model describes the structure of the cell membrane, where proteins and phospholipids float laterally throughout the membrane, creating a dynamic and flexible barrier.

Front

How are phospholipids arranged in the cell membrane?

Back

Phospholipids are arranged in a bilayer with their hydrophobic tails facing inward towards each other and their hydrophilic heads facing outward towards the water.

Front

What role do carbohydrates play in the cell membrane?

Back

Carbohydrates in the cell membrane contribute to cell adhesion, helping cells recognize and interact with each other.

Front

What type of transport is the sodium-potassium pump?

Back

The sodium-potassium pump is a type of antiport transport, moving sodium ions out of the cell and potassium ions into the cell against their concentration gradients.

Front

Define diffusion.

Back

Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration until equilibrium is reached.

Front

What is osmosis?

Back

Osmosis is the diffusion 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 the significance of membrane fluidity?

Back

Membrane fluidity is important for the proper functioning of the cell membrane, allowing for the movement of proteins and lipids, and facilitating cell signaling and transport.

Front

What are integral proteins?

Back

Integral proteins are proteins that are embedded within the lipid bilayer of the cell membrane and can span across the membrane, playing roles in transport and communication.

Front

What is the function of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the cell membrane's structure, maintaining fluidity and preventing it from becoming too rigid or too fluid.