Lance Armstrong, a lead in to the Cell Cycle (I know its lame), Mitosis, and what happens when Mitosis goes wrong!

Now we are about to start the section of this topic that all students seem to dread, the Cell cycle and Mitosis. In reality, for mitosis to occur billions of times in each of our bodies it must be a straightforward process; if it were not it would go wrong a lot more often than it actually does.

For information on what we mean by the cell cycle check out http://www.youtube.com/watch?index=5&playnext=1&v=lf9rcqifx34&list=PLCAB5B9A3792B6367

For an explanation of what occurs during the various stages of mitosis we can look at http://highered.mcgraw-hill.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/sites/dl/free/0072437316/120073/bio14.swf::Mitosis and Cytokinesis

Why dont eukaryotes just divide by binary fission like prokaryotes do? Check out this explanation http://www.youtube.com/watch?index=8&playnext=1&v=wJq4siahCSE&list=PLF7BB07F1973EF732

Finally why did I start with Lance Armstrong – Mitosis and Cancer!

We will be using another presentation from Mr Taylor in Indonesia http://de.slideshare.net/gurustip/cell-division-mitosis-2630874  and we will also look at performing an online simulationto identify the various stages of Mitosis in onion root tip cells.  http://www.biology.arizona.edu/cell_bio/activities/cell_cycle/cell_cycle.html

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Time for a helping hand

I do like Joe Cocker, but there is actually a reason for posting this video to the blog. To be successful in IB Biology is difficult and while I will do what I can to steer you through the next two years you will find it much easier if you help each other.

Before the holiday I split you into small groups and gave each group the task of producing a learning resource for one of the following Topic 2.1 curriculum statements:-

  • Outline the cell theory.
  • Discuss the evidence for the cell theory.
  • State that unicellular organisms carry out all the functions of life.
  • State that multicellular organisms show emergent properties.
  • Explain that cells in multicellular organisms differentiate to carry out specialized functions by expressing some of their genes but not others.
  • State that stem cells retain the capacity to divide and have the ability to      differentiate along different pathways.
  • Outline one therapeutic use of stem cells.

I will post your resources here, but that is after you have presented them to your peers in class!

So here you can find the resources produced by your peers

  • Outline the cell theory.
  • Discuss the evidence for the cell theory.
  • State that unicellular organisms carry out all the functions of life.Functions of Life
  • State that multicellular organisms show emergent properties. Emergent properties Prezzi
  • Explain that cells in multicellular organisms differentiate to carry out specialized functions by expressing some of their genes but not others.cell differentiation
  • State that stem cells retain the capacity to divide and have the ability to      differentiate along different pathways.
  • Outline one therapeutic use of stem cells.Outline one therapeutic use of stem cells

Time for Topic 2, CELLS

Well the first topic on statistical analysis seemed to go by quickly. Don’t worry if you feel like you could do with spending more time on  this topic, we will re-visit the concepts covered in Topic 1 many times over the next 2 years. We are now about to start Topic 2:Cells.

Here is the outline of the subjects we will cover in this topic topic-2-syllabus-outline. The good thing about studying cells is that we get to use microscopes, and at LAZ we have some really awesome microscopes! Remember that being proficient with the use of a microscope is a skill that needs to be developed, so don’t worry if you have difficulty seeing clear images first time. Keep practicing and you will get better!

Image from Toonpool.com

Image from Toonpool.com

In case you can’t remember the parts of a microscope check out http://www.microscopehelp.com/MicroscopePicture.gif You will need to learn these labels. In order to get the most out of your microscope you will need to be able to measure the dimesions of the things you are viewing. Follow this link for an excellent tutorial on how to Calibrate your microscope.

While we are talking about microscopes and looking at really small things, how small is small? You need to have an appreciation of the relative sizes of cells /bacteria/viruses/cell membranes/molecules etc. Two good web based resources for this are http://www.cellsalive.com/howbig.htm and http://learn.genetics.utah.edu/content/begin/cells/scale/ . Don’t want to go on-line, that is fine just check out your text book.

We will also be using THIS teaching resource from Stephen Taylor, you will come across his name many times during this course as we will use many of his powerpoints