Diffusion Flashcards
(26 cards)
What is diffusion?
Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration.
True or False: Diffusion requires energy input.
False
Fill in the blank: The rate of diffusion is influenced by temperature, concentration gradient, and _________.
surface area
What is a concentration gradient?
A concentration gradient is the difference in the concentration of a substance between two areas.
Multiple Choice: Which factor does NOT affect the rate of diffusion?
A) Temperature
B) Concentration gradient
C) Color of the substance
D) Surface area
C) Color of the substance
What type of molecules generally diffuse through the cell membrane easily?
Small, nonpolar molecules.
True or False: Diffusion can occur in solids, liquids, and gases.
True
Fill in the blank: The process of diffusion continues until ________ is reached.
equilibrium
What is the primary driving force behind diffusion?
The kinetic energy of molecules.
Multiple Choice: Which of the following is an example of diffusion?
A) Water moving through a cell membrane
B) Sugar dissolving in water
C) Air pressure equalizing in a balloon
D) All of the above
D) All of the above
What is facilitated diffusion?
Facilitated diffusion is the process by which molecules pass across the membrane through cell membrane channels.
True or False: Facilitated diffusion requires energy.
False
Fill in the blank: In osmosis, water moves through a selectively permeable membrane from an area of ________ concentration to an area of ________ concentration.
low solute; high solute
What is the role of channel proteins in diffusion?
Channel proteins facilitate the passage of specific molecules across a membrane.
Multiple Choice: Osmosis specifically refers to the diffusion of which substance?
A) Solids
B) Gases
C) Water
D) Nutrients
C) Water
What happens to the rate of diffusion as temperature increases?
The rate of diffusion increases.
True or False: Diffusion can occur against a concentration gradient.
False
Fill in the blank: The movement of oxygen and carbon dioxide in and out of cells is an example of ________ diffusion.
simple
What type of molecules require facilitated diffusion?
Large or polar molecules.
Multiple Choice: Which of the following is NOT a characteristic of diffusion?
A) It is a passive process
B) It requires a membrane
C) It results in the equal distribution of molecules
D) It occurs in all states of matter
B) It requires a membrane
What occurs when equilibrium is reached in a diffusion process?
Molecules continue to move, but there is no net change in concentration.
True or False: Diffusion is a slow process that only occurs over short distances.
True
Fill in the blank: The process by which nutrients enter cells through diffusion is known as ________.
nutrient uptake
What is the difference between diffusion and active transport?
Diffusion is a passive process that does not require energy, while active transport requires energy to move substances against their concentration gradient.
