Begin by distinguishing between osmosis and diffusion; how are they similar? In what ways are they different?
Let's end with definitions and explanations of membrane potentials.© BrainMass Inc. brainmass.com October 17, 2018, 4:39 am ad1c9bdddf
Diffusion is the movement of any substance other than water from an area of high concentration to an an area of low concentration. Osmosis is very similar, except that osmosis refers to the movement of water ONLY as it moves through a semi-permeable membrane.
Consider these two examples:
1. A tree requires water (has a low concentration of water). The root system of the tree is able to absorb water from the ground (which has a high concentration of water). This would be an example of osmosis.
2. You put a drop of food coloring into a glass of water. Initially the food coloring is localized in one spot, the rest of the water clear. After allowing several minutes to pass, you will notice that all of the food coloring has spread out evenly within the water. This is diffusion as it is the food ...
This solution provides real world examples to help illustrate the scientific principles of diffusion and osmosis. Additionally, the cell membrane and membrane potential are also discussed. Useful links are included.
Many of water's unique properties...
1. Many of water's unique properties are the result of its polar covalent bonds, which allow water molecules to form hydrogen bonds with each other. What if water molecules instead had nonpolar covalent bonds? Make a list of hypothesis about the ways in which this change might affect the properites of water. Describe how each change would effect living things. Design an experiment to test one of your hypothesis.
2. Plant roots take up minerals (inorganic ions such as potassium) that are dissolved in the water of the soil. The concentration of such ions is usually much lower in the soil water than in cytoplasm of root cells. Design the plasma membrane of a hypothetical mineral-absorbing cell, with special reference to mineral-permeable channel proteins and mineral-transporting active-transport proteins. Justify you choice of channel proteins and active-transport proteins.View Full Posting Details