Diffusion Flashcards
What is diffusion?
Diffusion is the movement of molecules from an area of high concentration to an area of low concentration.
True or False: Diffusion requires energy input.
False
Fill in the blank: Diffusion is a ______ process.
Passive
What factors affect the rate of diffusion?
Temperature, concentration gradient, surface area, and molecular size.
Which type of molecules diffuse more quickly: small or large molecules?
Small molecules
What role does the cell membrane play in diffusion?
The cell membrane selectively allows certain molecules to pass through via diffusion.
What is osmosis?
Osmosis is the diffusion of water across a selectively permeable membrane.
Fill in the blank: In osmosis, water moves from an area of ______ water concentration to an area of ______ water concentration.
low, high
What is facilitated diffusion?
Facilitated diffusion is the process where molecules are transported across the cell membrane with the help of transport proteins.
True or False: Facilitated diffusion requires energy.
False
What is the difference between simple diffusion and facilitated diffusion?
Simple diffusion does not require transport proteins, while facilitated diffusion does.
What is active transport?
Active transport is the movement of molecules from an area of low concentration to an area of high concentration using energy.
Fill in the blank: Active transport requires the use of ______.
Energy (ATP)
What is the importance of diffusion in cells?
Diffusion is essential for the transport of nutrients, waste removal, and maintaining cellular homeostasis.
How does temperature affect the rate of diffusion?
Higher temperatures increase the rate of diffusion as molecules have more kinetic energy.
What is the significance of the concentration gradient in diffusion?
The greater the concentration gradient, the faster the rate of diffusion.
What is the role of ion channels in diffusion?
Ion channels allow specific ions to pass through the cell membrane via diffusion.
What is the driving force behind diffusion?
The driving force behind diffusion is the random movement of molecules.
True or False: Diffusion is a passive process.
True
What is the main difference between diffusion and active transport?
Diffusion does not require energy input, while active transport does.
How does the size of molecules impact diffusion?
Smaller molecules diffuse more rapidly than larger molecules.
What is the significance of surface area in diffusion?
A larger surface area allows for more efficient diffusion.
How does molecular weight affect the rate of diffusion?
Lighter molecules diffuse faster than heavier molecules.
What is the role of carrier proteins in facilitated diffusion?
Carrier proteins assist in the transport of molecules across the cell membrane during facilitated diffusion.
What is the importance of diffusion in gas exchange in the lungs?
Diffusion allows for the exchange of oxygen and carbon dioxide between the alveoli and capillaries in the lungs.
What is the significance of diffusion in plant roots?
Diffusion helps in the uptake of water and minerals from the soil by plant roots.
How does the lipid bilayer of the cell membrane impact diffusion?
The lipid bilayer provides a barrier that certain molecules can diffuse through.
What is the role of aquaporins in osmosis?
Aquaporins are water channel proteins that facilitate the movement of water during osmosis.
