wk9, looking ahead to wk10

First off, my apologies to you that I wasn't able to be in class last week.  But thanks to teacher Christy and teacher Cindy for filling in!

I hope that you learned a lot in wk 9's readings, because there was definitely a lot to learn.  Some key points to remember:

• DNA is the molecule that contains our genetic information; it is very long; each molecule of DNA is organized in a tightly wound manner into chromosomes
• During DNA replication a complete copy of each chromosome is made
• RNA is a single-stranded nucleotide made directly from DNA; there three types of RNA including messenger RNA (mRNA), ribosomal RNA (rRNA), and transfer RNA (tRNA)
• RNA is used for transcription (the copying individual genes from the DNA code and moving those copies outside the nucleus) and translation (the forming of polypeptide proteins according to "code")
• Genes are distinct segments of DNA in the chromosome which code for a single protein/protein complex

Looking ahead to wk 10

The wk10 reading and videos are related to wk9.  The replication of DNA is an important part what is known as the Cell Cycle.  This is basically the life history of a cell - it grows, replicates its DNA, grows some more and checks for mistakes, splits in two, and we start over again.

Each phase and step in the process serves a purpose.  Some cells go through the entire cell cycle at a very rapid pace.  Other cells move through it slowly.  Still other cells, such as neurons, leave the cycle after the G1 phase and go to what is known as G0.  These cells spend so much time functioning they don't have time to replicate.

So finish this week's reading, and check out the additional videos.  Don't forget about your vocabulary list, too.

10 Cell Division, Cell Cycle, Chromosomes, Mitosis, Cytokinesis

RSO Ch. 8 Mitosis

LOE Ch 9 Intro-Review

CK12 BC 2.32-2.35

CK12 LSC 2.17-2.19

Cell Cycle and Mitosis - transition, Amoeba sisters talk about cell cycle and growth. Including cancer Mitosis: Amazing - transition, Amoeba sisters cover mitosis and the role of chromosomes Mitosis Dance - both, humorous mitosis dance by college genetics class Phases of Mitosis - Scholar, a well-done explanation by Bozeman Science looking at all the changes in each phase of mitosis Mitosis - scholar, Crash Course video on mitosis. Sometimes watching two videos on the same thing can help cement the ideas.