The Cell in Its Environment

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a process that allows large or polar molecules, such as sugars, to cross the cell membrane with the help of protein channels, without the use of energy.

Front

What type of transport is used when glucose enters a liver cell?

Back

Facilitated diffusion is used when glucose enters a liver cell through protein channels.

Front

What is osmosis?

Back

Osmosis is the movement of water molecules through a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is exocytosis?

Back

Exocytosis is a process where a cell expels large particles or substances by enclosing them in a vesicle that fuses with the cell membrane.

Front

What is the difference between active transport and passive transport?

Back

Active transport requires energy to move substances against their concentration gradient, while passive transport does not require energy and moves substances along their concentration gradient.

Front

What are protein channels?

Back

Protein channels are integral membrane proteins that facilitate the transport of specific molecules across the cell membrane.

Front

What is endocytosis?

Back

Endocytosis is the process by which a cell engulfs external substances, bringing them into the cell within a vesicle.

Front

What is the role of the cell membrane?

Back

The cell membrane regulates what enters and exits the cell, providing protection and structural support.

Front

What is a semipermeable membrane?

Back

A semipermeable membrane is a barrier that allows certain substances to pass through while blocking others, often used in biological contexts.

Front

What is the significance of concentration gradients in cellular transport?

Back

Concentration gradients drive the movement of substances across membranes, with molecules moving from areas of high concentration to areas of low concentration in passive transport.