This video shows microscope footage of pond water. Look for paramecium and rotifers.
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This video shows a prepared slide of an onion root tip sample. Cells in the various stages of the cell cycle can be observed. See if you can find examples from the different stages of the cell cycle. Interphase: Time in between cell divisions Mitosis: Prophase Metaphase Anaphase Telophase (Cytokinesis*) *Cytokinesis actually begins as early as anaphase and lasts until the end of telophase A: Both! Osmosis is the diffusion of water into or out of cells depending on the concentration gradient. Water will flow from where the water is at a higher concentration to where water is at a lower concentration. Watch this video for a discussion of changes in red onion cells placed into pure water or salt water environments. Small, nonpolar molecules that can diffuse through the cell membrane include O2 and CO2. Larger molecules (glucose for example) are too big to do this. Water molecules are small enough to move through the phospholipid bilayer, but their polarity means they do not move as easily as O2 and CO2 through the membrane. So how else can water move into or out of cells? Water can also move into or out of cells through channel proteins called aquaporins. These proteins molecules act as doorways through which water can pass. https://d2gne97vdumgn3.cloudfront.net/api/file/7OXsKNrsT9a1lgGjncak This video uses a computer simulation from PhET to help you visualize how channel proteins allow for movement of particles in or out of cells and discusses the role of the concentration gradient in determining the direction of flow. Hope this helps!
This video uses the Flash tutorial from PBS to review the central dogma of molecular biology. The video illustrates how information stored in DNA is used to make an RNA molecule which is later used by ribosomes to build proteins which will determine traits. This video discusses key parts of the scientific method by introducing an experiment students conduct to determine the best survival strategy to delay onset of hypothermia due to submersion in cold water. This video discusses the topic of diffusion through cell membranes. Topics of discussion include: channel proteins, passive & active transport, concentration gradients and dynamic equilibrium. This video discusses how osmosis can change the appearance of red onion cells by adding or removing water from the cells. This video discusses the goals and characteristics of the scientific world view. This video discusses the characteristics of living organisms. This video discusses the six levels of organization in ecology: species, populations, communities, ecosystem, biome and biosphere. The video highlights the ecology of Minnesota. |
Noel PaullerThank for visiting my blog where I post thoughts from the random corner of the universe which is my brain. Archives
October 2022
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