Diffusion 🌷 Flashcards
What is diffusion?
Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration.
True or False: Diffusion requires energy input.
False
Fill in the blank: The rate of diffusion is influenced by temperature, concentration gradient, and __________.
molecular size
Which of the following factors does NOT affect the rate of diffusion? A) Temperature B) Pressure C) Color D) Concentration gradient
C) Color
What is the concentration gradient?
The concentration gradient is the difference in concentration of a substance between two areas.
True or False: Diffusion can occur in solids, liquids, and gases.
True
Which process describes the movement of water molecules across a semi-permeable membrane?
Osmosis
Short answer: What is Fick’s law of diffusion?
Fick’s law states that the rate of diffusion of a substance is proportional to the concentration gradient.
What is the primary driving force behind diffusion?
The concentration gradient.
True or False: Larger molecules diffuse faster than smaller molecules.
False
Fill in the blank: In a hypertonic solution, the concentration of solutes is __________ outside the cell compared to inside.
higher
What is facilitated diffusion?
Facilitated diffusion is the process by which substances cross membranes with the assistance of special proteins.
Multiple choice: Which of the following is an example of diffusion? A) Breathing B) Sweating C) Perfume spreading in a room D) All of the above
D) All of the above
True or False: Diffusion can only occur in gases.
False
Short answer: What role does the semi-permeable membrane play in diffusion?
It allows certain molecules to pass while restricting others, affecting the diffusion process.
What is the difference between passive and active transport?
Passive transport does not require energy, while active transport requires energy to move substances against their concentration gradient.
Fill in the blank: __________ diffusion does not require a membrane.
Simple
What is the significance of diffusion in biological systems?
Diffusion is crucial for processes such as nutrient uptake, gas exchange, and waste removal in cells.
True or False: The speed of diffusion increases with higher temperatures.
True
What is the term for the net movement of molecules from an area of low concentration to an area of high concentration?
Active transport
Multiple choice: Which statement is true? A) Diffusion occurs only in liquids B) Diffusion is a passive process C) Diffusion requires a semi-permeable membrane D) All of the above
B) Diffusion is a passive process
Fill in the blank: The process of diffusion continues until __________ is reached.
equilibrium
What are the two types of diffusion?
Simple diffusion and facilitated diffusion.
True or False: Diffusion can occur in a vacuum.
False
Short answer: What is the role of temperature in diffusion?
Higher temperatures increase molecular motion, leading to faster diffusion.
