Review: Osmosis and diffusion
Osmosis and diffusion are essential processes in biology that describe how substances move across cell membranes, impacting cell function and homeostasis.
Quiz(12 preguntas)
1. Which process describes the movement of water across a membrane?
Términos en este set(13)
What is osmosis?
Osmosis is the movement of water molecules through a selectively permeable membrane from an area of low solute concentration to high solute concentration.
What is diffusion?
Diffusion is the movement of particles from an area of high concentration to an area of low concentration until equilibrium is reached.
True or false: Osmosis involves only water.
True, because osmosis specifically refers to the movement of water molecules.
Difference between osmosis and diffusion?
Osmosis is specific to water movement, while diffusion involves various types of particles.
Fill in the blank: Water moves from ___ to ___ concentration in osmosis.
Water moves from low solute concentration to high solute concentration.
What influences the rate of diffusion?
Factors include temperature, concentration gradient, and the size of the particles.
What is a selectively permeable membrane?
A selectively permeable membrane allows certain substances to pass while blocking others, crucial for cell homeostasis.
True or false: Diffusion requires energy.
False, because diffusion is a passive process and does not require energy.
How does temperature affect osmosis?
Higher temperatures increase kinetic energy, speeding up the rate of osmosis.
Define equilibrium in context of diffusion.
Equilibrium is reached when particle concentration is equal on both sides of the membrane.
What role do proteins play in osmosis?
Proteins, like aquaporins, facilitate the movement of water across membranes during osmosis.
What happens to a cell in a hypertonic solution?
A cell loses water and may shrink, as the solution has a higher solute concentration than the cell.
What is active transport?
Active transport moves substances against their concentration gradient and requires energy, unlike diffusion.
Preguntas en este set(12)
1. Which process describes the movement of water across a membrane?
2. What happens to a cell placed in a hypotonic solution?
3. Which of the following is NOT a factor influencing diffusion?
4. Fill in the blank: Diffusion occurs from an area of ___ to ___ concentration.
5. What type of solution causes a cell to burst?
6. True or false: Diffusion requires energy.
7. Which process moves substances against their concentration gradient?
8. How do proteins assist in osmosis?
9. How does increased temperature affect osmosis?
10. What characterizes a hypertonic solution?
11. What is a key difference between osmosis and diffusion?
12. Fill in the blank: The process of substances moving to equal concentrations is called ___.
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