Cellular Processes

Front

What is endocytosis?

Back

Endocytosis is the process by which cells internalize substances from their external environment by engulfing them in a membrane-bound vesicle.

Front

What is the main difference between diffusion and facilitated diffusion?

Back

Facilitated diffusion requires the help of a protein to transport molecules, whereas diffusion allows molecules to move directly across the membrane without assistance.

Front

What is a semi-permeable membrane?

Back

A semi-permeable membrane is a type of biological membrane that allows certain molecules or ions to pass through it by diffusion and occasionally by facilitated diffusion.

Front

What is passive transport?

Back

Passive transport is the movement of particles across a cell membrane from an area of high concentration to an area of low concentration without the use of energy.

Front

What is osmosis?

Back

Osmosis is the process by which water molecules move across a semi-permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What role do proteins play in facilitated diffusion?

Back

Proteins act as channels or carriers that help transport specific molecules across the cell membrane during facilitated diffusion.

Front

What is the significance of concentration gradients in cellular processes?

Back

Concentration gradients drive the movement of substances across membranes, influencing processes like diffusion, osmosis, and active transport.

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 gradient.

Front

What is the function of vesicles in endocytosis?

Back

Vesicles are membrane-bound sacs that transport materials into the cell during endocytosis, enclosing the substances taken in.

Front

How does temperature affect the rate of diffusion?

Back

Higher temperatures increase the kinetic energy of molecules, leading to a faster rate of diffusion.

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