Osmosis vs Diffusion Quiz
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Questions and Answers

What is the difference between osmosis and diffusion?

Osmosis is the movement of water molecules through the cell. Diffusion is the movement of molecules, such as oxygen, in and out of a cell.

What is osmosis?

The process by which water molecules are able to diffuse through the cell membrane.

What is diffusion?

The movement of small molecules from a higher concentration to an area of lower concentration.

What is passive transport?

<p>The movement of dissolved materials across the cell membrane without needing the cell's energy.</p> Signup and view all the answers

What is active transport?

<p>The movement of materials through the cell membrane that needs to use the cell's supply of its own energy.</p> Signup and view all the answers

What does selectively permeable mean?

<p>The cell's membrane is like a gatekeeper; it allows some things to enter and exit.</p> Signup and view all the answers

Why are cells small?

<p>It affects how materials move in and out of a cell. If cells were larger, it would take longer for materials to move around and for wastes to be removed.</p> Signup and view all the answers

Using diffusion, explain what occurred to the drop of food coloring in the container of water.

<p>The molecules from the drop of food coloring moved from a more concentrated area to a less concentrated area, spreading evenly throughout the volume of water.</p> Signup and view all the answers

Flashcards

Osmosis

The movement of water molecules through a cell membrane.

Diffusion

Movement of molecules from high to low concentration.

Passive Transport

Movement across the membrane without using energy.

Active Transport

Movement across the membrane that needs energy.

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Selectively permeable

Cell membrane lets some things pass through.

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Small cells

Small cells help material transport and waste removal.

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Food coloring diffusion

Molecules move from high to low concentration.

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Cell Membrane

The outer layer that controls what enters and exits the cell.

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High Concentration

Many molecules in a small space.

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Low Concentration

Few molecules in a large space.

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Water Movement

Water molecules travel from high to low water concentration through a selectively permeable membrane.

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Molecule Movement

Molecules move from high to low concentration; this is diffusion.

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CellSize

Cell size affects how quickly materials move.

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Cell Transport

Movement of materials into and out of a cell.

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Transport Types

Passive or active ways that materials move through the membrane.

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Concentration Gradient

Difference in concentration of molecules across a space.

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Study Notes

Differences Between Osmosis and Diffusion

  • Osmosis: Movement of water molecules across a cell membrane.
  • Diffusion: Movement of various molecules (e.g., oxygen) in and out of the cell, from higher to lower concentration.

Osmosis

  • Defined as the diffusion of water molecules through a semi-permeable cell membrane.

Diffusion

  • Involves small molecules moving from an area of higher concentration to one of lower concentration.

Passive Transport

  • Refers to the movement of dissolved materials across the cell membrane without requiring cellular energy.

Active Transport

  • Involves the movement of materials through the cell membrane that requires the cell's own energy supply.

Selectively Permeable Membrane

  • Cell membranes serve as gatekeepers, allowing specific substances to enter or exit while blocking others.

Importance of Cell Size

  • Smaller cells facilitate efficient material movement across the cytoplasm.
  • Larger cells risk inefficiency in reaching the center and removing toxic wastes, hindering survival.

Diffusion Observation

  • A drop of food coloring in water spreads as the concentrated molecules move to less concentrated areas, achieving even distribution throughout the water.

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Description

Test your understanding of the differences between osmosis and diffusion, essential processes in cell biology. This quiz will cover key concepts such as passive and active transport, selectively permeable membranes, and the significance of cell size. Perfect for biology students looking to reinforce their knowledge!

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