Cell Transport / Cells Review

Front

What is the process of facilitated diffusion?

Back

Facilitated diffusion is a type of passive transport that uses proteins to help molecules pass through the cell membrane without the use of energy.

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What is the end result of diffusion?

Back

The end result of diffusion is the equal distribution of molecules across a space, leading to a state of equilibrium.

Front

Define active transport.

Back

Active transport is the movement of particles through the cell membrane from a region of lower concentration to a region of higher concentration, requiring energy in the form of ATP.

Front

What is required for active transport?

Back

Active transport requires energy, typically in the form of ATP, to move substances against their concentration gradient.

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What does 'selectively permeable' mean?

Back

'Selectively permeable' refers to a property of cell membranes that allows certain molecules to pass through while blocking others.

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.

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What role do proteins play in facilitated diffusion?

Back

Proteins act as channels or carriers that assist specific molecules in crossing the cell membrane during facilitated diffusion.

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What is the concentration gradient?

Back

The concentration gradient is the difference in concentration of a substance between two areas, which drives the movement of molecules during diffusion.

Front

What is osmosis?

Back

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

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What is an example of a substance that uses facilitated diffusion?

Back

Glucose is an example of a substance that uses facilitated diffusion to enter cells through specific transport proteins.