31 Questions
Which type of transport requires cellular energy?
Active transport
What is the main factor affecting movement across a membrane?
Surface area to volume ratio
Which process is mediated through transmembrane proteins?
Facilitated diffusion
What is the role of diffusion and osmosis in a cell's ability to maintain homeostasis?
Maintaining internal balance of substances
What would happen to the tubes if left in the beaker for 2 hours?
The tubes would undergo osmosis and there would be a change in their weights due to the movement of water across the membrane.
How does relative diffusion volume depend on the surface-to-volume ratio?
As the surface-to-volume ratio decreases, the relative diffusion volume increases.
Why do you think the cells of our body do not get as big as the largest cell?
The largest cell has a lower surface-to-volume ratio, making it less efficient for nutrient exchange.
What influences cell size restriction?
Surface area to volume ratios
What is diffusion primarily caused by?
Molecular motion and natural increase in entropy
In which state of matter is diffusion slow?
Solids
What type of data is used for statistical analysis in quantitative observations?
Numerical data
What is osmosis defined as?
Diffusion of water across differentially permeable membrane
What occurs when solute molecules are unable to diffuse?
Osmosis
What is the primary focus of procedure 1 in the lab?
Qualitative observations
What is the main activity in procedure 2 of the lab?
Measuring balloon volume change
What does a differentially permeable membrane demonstrate in the lab?
Effects of osmosis
What is the difference between qualitative and quantitative observations?
Use of numerical vs non-numerical data
What factor influences the rate of diffusion and osmosis?
Surface area to volume ratios
What defines the restriction of cell size?
Surface area to volume ratios
What is a differentially permeable membrane?
A membrane that allows only certain molecules to pass through
What serves as a membrane in the exercise?
Dialysis tubing
What is the primary function of osmosis?
To allow water to pass through a differentially permeable membrane by diffusion
What do diffusion rates depend on?
A cell’s surface-to-volume ratio
What is the primary purpose of using agar cubes in the exercise?
To calculate the surface area, volume, and surface-to-volume ratio
What is the purpose of the data sheet for diffusion and osmosis?
To include questions about the diffusion of air/carbon dioxide in balloons
Which molecules pass easily through cellulose membranes?
Water
What does osmosis involve?
Water passing through a differentially permeable membrane by diffusion
What is the main focus of the exercise?
Measuring diffusion rates and their dependence on surface-to-volume ratio
What is the primary purpose of using rubber balloons in the exercise?
To demonstrate differentially permeable membranes
What is the exercise mainly concerned with in relation to diffusion?
How diffusion times depend on the surface-to-volume ratio
What is the primary focus of the data sheet for diffusion and osmosis?
Questions about the permeability of rubber balloons to different gases
Study Notes
Diffusion, Osmosis, and Permeability in Biological Membranes
- Differentially permeable membranes allow certain molecules to pass through while stopping others
- Examples of differentially permeable membranes include rubber balloons and cell membranes made of phospholipids and proteins
- Dialysis tubing serves as a membrane in the exercise
- Water molecules pass easily through cellulose membranes, while sucrose molecules do not
- Osmosis occurs when water passes through a differentially permeable membrane by diffusion, while sucrose cannot
- The exercise involves measuring the rate of osmosis for different sugar solutions
- Diffusion rates depend on a cell’s surface-to-volume ratio
- The exercise explores how diffusion times depend on the surface-to-volume ratio
- Agar cubes of different sizes are used to measure the diffusion rate of sodium hydroxide
- The surface area, volume, and surface-to-volume ratio of each agar cube are calculated
- The exercise involves observing the diffusion of NaOH into agar/phenolphthalein blocks and making related calculations
- The data sheet for diffusion and osmosis includes questions about the diffusion of air/carbon dioxide in balloons and the permeability of rubber balloons to different gases
Test your knowledge of diffusion, osmosis, and permeability in biological membranes with this quiz. Explore concepts such as differentially permeable membranes, osmosis, and the factors influencing diffusion rates. Challenge yourself with questions about dialysis tubing, agar cubes, and the diffusion of gases in rubber balloons.
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