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Bio Project

צור לוח סיפור
העתק את לוח התכנון הזה
Bio Project
צור משלך! לְהַעְתִיק

טקסט Storyboard

  • Today's lab is a review on Mitosis in the unicellular organism the Ameoba
  • Who cares about Ameobas! Yeah! What will I ever need to know about this for?
  • OUCH! I cut my finger!
  • Mitosis refers to the splitting of chromosomes in eukaryotic cells.
  • Well, what a great chance to tell you all about how we are like Ameobas and why it's important to know about them. First, take this band-aid for your cut.
  • Who can tell me what we are learning in this lab has to do with how the cut on Amanda's finger is going to heal?
  • We have no clue!
  • Since an Ameoba is a single celled organism it has to make an exact copy of itself in order to reproduce. In order to get that copy the DNA inside the Ameoba has to replicate. Let's review what we learned:
  • DNA is made up of Nucleotides (a base, sugar and phosphate) that is shaped in a double helix. The enzyme DNA Helicase separates the DNA by breaking hydrogen bonds between bases on two different strands and unwinds the helix at locations called replication origins.Base Adenine binds with Thymine and Guanine binds with Cytosine. DNA Polymerase III adds Nucleotides to DNA to make 2 new strands. The separate strands run anitparallel to each other.The whole process is semi-conservative
  • This process of DNA replication takes place in the S phase of Interphase.
  • Oh yeah, I remember that. Interphase is where the cell spends most of its time and gets itself ready to divide. It happens right before Mitosis!
  • Right! Great, now tell me what else you know about Mitosis
  • Mitosis produces new cells, replaces cells that are old, lost or damaged. Two identical daughter cells are formed. The phase of Mitosis are:Prophase - DNA condenses from chromatin to chromosomes; nuclear membrane breaks down; spindle fibers form; nuclear envelope is apparent.Metaphase - Sister chromatids line up in the center of the cell; spindle fibers attaches to the center of the chromatids (centromeres)Anaphase - Chromosomes are pulled apart by the spindle fibers to opposite sides of the cell; sister chromatids have separated; chromosomes move toward opposite poles of the cellTelephase - Spindle fibers dissolve; DNA condenses; nuclear membrane forms around DNAAnd don't forget Cytokinesis - even though it's not part of mitosis it is when the cell pinches to form two identical daughter cells and completes the cell cycle.
  • So my cells will go though DNA replication and Mitosis to make more of themselves so the cut will heal.
  • Very good! And now you can see why this is important to how your cut will heal. Your cells will need to use these two processes to make identical cells to help your skin grow, repair and replace those cells that were damaged when you cut yourself.
  • I guess I was wrong, I did need to know about an Ameoba
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