🤗HW25: 11.17

Front

What is the plasma membrane?

Back

The plasma membrane is a biological membrane that separates and protects the interior of all cells from the external environment. It is selectively permeable, allowing certain substances to pass while blocking others.

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the need for energy input. It occurs along the concentration gradient, from areas of higher concentration to areas of lower concentration.

Front

Define diffusion.

Back

Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration until they are evenly distributed.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What are pathogens?

Back

Pathogens are microorganisms, such as bacteria, viruses, fungi, or parasites, that can cause disease in a host organism.

Front

What does it mean for a membrane to be permeable?

Back

A permeable membrane allows substances to pass through it freely.

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 is the significance of concentration gradients in diffusion?

Back

Concentration gradients drive the process of diffusion, as substances naturally move from areas of higher concentration to areas of lower concentration to achieve equilibrium.

Front

What is endocytosis?

Back

Endocytosis is the process by which cells engulf substances from their external environment, bringing them into the cell in a vesicle.

Front

What is the role of the plasma membrane in cell communication?

Back

The plasma membrane contains receptors that allow cells to receive signals from their environment, facilitating communication and response to external stimuli.