Cell Transport

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a passive transport process that allows molecules to cross the cell membrane with the help of transport proteins, moving from an area of high concentration to an area of low concentration without the use of energy.

Front

What are protein pumps?

Back

Protein pumps are integral membrane proteins that actively transport molecules across the cell membrane against their concentration gradient, requiring energy (usually from ATP).

Front

What is the main function of the cell membrane?

Back

The cell membrane regulates what enters and exits the cell, providing protection and structural support, and facilitating communication with other cells.

Front

What are phospholipids?

Back

Phospholipids are a type of lipid molecule that make up the majority of the cell membrane, consisting of a hydrophilic (water-attracting) 'head' and two hydrophobic (water-repelling) 'tails'.

Front

What is the difference between passive 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 concentration gradient.

Front

What role do proteins play in cell transport?

Back

Proteins facilitate the movement of molecules across the cell membrane, either by forming channels for facilitated diffusion or by acting as pumps for active transport.

Front

What is osmosis?

Back

Osmosis is the passive movement of water molecules across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration.

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 during diffusion.

Front

What is the role of carbohydrates in the cell membrane?

Back

Carbohydrates are involved in cell recognition and signaling, often attached to proteins or lipids on the extracellular surface of the cell membrane.

Front

What is endocytosis?

Back

Endocytosis is an active transport process where the cell engulfs material from the outside environment, forming a vesicle to bring it into the cell.