321 Cell Membrane and Transport Flashcard Kanya 2024

Front

What is passive transport?

Back

Passive transport is the movement of molecules across a cell membrane without the use of energy, including processes like diffusion, osmosis, and facilitated diffusion.

Front

Define selectively permeable membrane.

Back

A selectively permeable membrane is one that allows certain molecules to pass through while blocking others, enabling the cell to maintain homeostasis.

Front

What is active transport?

Back

Active transport is the movement of molecules from an area of low concentration to an area of high concentration, requiring energy (ATP) to do so.

Front

Explain facilitated diffusion.

Back

Facilitated diffusion is the process by which large or polar molecules move across a cell membrane through protein channels from an area of high concentration to an area of low concentration without energy.

Front

What does hydrophilic mean?

Back

Hydrophilic refers to substances that are 'water-loving' and can easily interact with water, often dissolving in it.

Front

What is osmosis?

Back

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

Front

Describe diffusion.

Back

Diffusion is the process by which molecules spread from an area of high concentration to an area of low concentration until equilibrium is reached.

Front

What is the role of protein channels in cell membranes?

Back

Protein channels facilitate the transport of specific molecules across the cell membrane, allowing substances that cannot pass through the lipid bilayer to enter or exit the cell.

Front

What is the difference between simple diffusion and facilitated diffusion?

Back

Simple diffusion involves the movement of small, nonpolar molecules directly through the lipid bilayer, while facilitated diffusion requires protein channels for larger or polar molecules.

Front

Define 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.