THE PROKARYOTIC CELL CYCLE
Professor H. Bond
Hi, I'm Ed Steimel
Hi, I'm Melissa Steimel
This is our friend, Professor Bond
Professor Bond is here to help us with our creative project. What are you going to talk about, Professor?
The name's BOND....H-BOND.
Well, Melissa, today I'll be taking you through the Prokaryotic Cell Cycle
We're not biology majors, Professor. Can you explain this cycle in layman's terms?
I'll try my best, Ed. Let's start with the definition of a prokaryotic cell.
Prokaryotic Cells are simple structures. They have no organells, only 1 chromosome, and no nucleus.
How does the cell survive without a nucleus?
Yeah, I thought all cells had a nucleus.
Prokaryotic cells don't have a nucleus because the nucleus of other cells contains the chromosomes and prokaryotic cells only have one chromosome that contains all the DNA necessary for the cell to survive.
What organisms are made up of prokaryotic cells, Professor?
Great question, Melissa. Prokaryotic cells are bacteria, like this little guy.
OK, a prokaryotic cell is a bacteria. What's the prokaryotic cell cycle?
The prokaryotic cell cycle is a long period of growth that includes replication of its DNA.
The definition of the cycle is on the board...
...but a better way to answer that question is to look at the cycle itself.
Here is a typical prokaryotic cell. As you can see, the circular DNA is attached to the plasma membrane.
We're with you so far,Professor.
What's the next step in the cycle, Professor?
The next step is really exciting. The DNA clones itself... and SPLITS!!!
THE DNA SPLITS!!! AAAAAGGGGHHH!!!!
What's wrong with Ed?
THE DNA SPLITS!
What's wrong, honey?
It's OK, honey. Let's ask Professor Bond WHY the DNA splits.
You can relax, Ed. The DNA splits so that the cell can expand.
How does binary fission work?
This process is called binary fission. Binary fission literally means "splitting in two". Let's look at a representation of this process...
The plasma membrane expands to make room for the added DNA double helix.
Double felix? That sounds like double trouble. What could you possibly mean, Professor Bond?
Not double FELIX, Melissa, double HELIX. It's the structure of the DNA molecule.
After the DNA splits, the cell adds more plasma membrane between the double helices.
Eventually the plasma membrane grows into the middle of the cell. Can you guess what will happen when enough plasma membrane gets into the middle of the cell?
Hmmm... The cell is divided into two sections, like rooms in a house?
The cell becomes two cells?
Exactly, Ed. Eventually the original cell, called the parent cell, divides into two cells. These new cells are called...
You're both on the right track. The new cells are called daughter cells, and they complete the prokaryotic cell cycle.
WOW!! That was really cool, Professor. I was a little scared about the DNA splitting, but it all worked out.
I learned some new terms and that DNA is called a double Helix. Great job, Professor.
Glad I could help. Good luck on your project.
Thanks, Professor, we'll take all the luck we can get.
Dr. Christianson, we hope you enjoyed our project. Bye!!
Ed Steimel & Melissa Steimel
Special thanks to "Professor H. Bond"
BIO101 Creative Project FALL 2013