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?
Signup and view all the answers
What is active transport?
Signup and view all the answers
What does selectively permeable mean?
Signup and view all the answers
Why are cells small?
Signup and view all the answers
Using diffusion, explain what occurred to the drop of food coloring in the container of water.
Signup and view all the answers
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.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
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!
