Sunday, December 16, 2007
Comment on Philip's Blog
comment on philip's blog
comment on Philipos Blog
i would like to comment on Philip's blog about how cross over takes places. he was right about how it takes places, but could have gone more in depth about it.
Crossing over takes places in prophase 1 of meiosis 1. Chromosomal crossover is the process by which two homologous chromosomes exchange portions of DNA. Crossover usually occurs when portions of homologous chromosomes brake off and rejoin with other chromosomes. This is the exchange of genes, which is called genetic recombination.
Friday, December 14, 2007
comment on Philipos Blog
comment on CHAPTER 13
philip i liked the your post about meiosis and mitosis and the stages they go through. meiosis and mitsosis has much more then these process. you should've mentioned somethign about crossoverin detail for example it's a exchange of genetic material between homologues that occurs in prohase1 of meiosis 1. And also you should've talk msomethign about the three types of life cycle which are animal, fungi and plant. and their functions are: plant: alternation of generation, diploid stage is called sporophyte in which spores produce plant and haploid stage is gametophyte in which gametes produce plants divide mitotically. You should've mentioned some information about Asexual and sexual reproduction. I think that's about it philip
comment on Philips Blog
Comment on Philips post
Dorathy
Thursday, December 13, 2007
comment on Roxxaine blog
Thursday, December 6, 2007
Part II Meiosis
Part 1 of Meiosis
Friday, October 26, 2007
Thursday, October 25, 2007
10.25 chapter 9 review
Today we reviewed chapter 9, which was on cellular respiration.
So here are some quick notes for review.
Oxidation: lose electrons, release energy, exergonic.
Reduction: gain electrons, stores energy, endergonic.
The three stages of cellular respiration: glycolysis, citric acid cycle, oxidative phosphorylation.
~38 ATPs / 1 glucose
Two types of fermentation: alcohol and lactic acid.
To remember, just remind yourself that lactic acid fermentation is what we experienced when we did that painful bending exercise and alcohol fermentation is what we’ll be doing with the root beer experiment.
“I really don’t like your boyfriend, Glycolysis. He’s not producing enough ATP.”
10.24 Chapter 8 Review
So yesterday we reviewed chapter 8, which was an introduction to metabolism. Here are some quick notes you should remember.
-Metabolism includes all of the chemical reactions in an organism.
-Catabolic pathways breaks down more complex molecules to simpler ones.
-Anabolic pathways makes complex molecules from simpler ones.
----To remember anabolic pathways, I thinking of anabolic steroids helps me. They are steroids that build up the body’s muscle mass. Don’t ask me why I know that.
-The first law of thermodynamics states that energy can be transferred and transformed but cant be created nor destroyed.
-The second law of thermodynamics explains that energy transfer or transformation increases the entropy, disorder, of the universe.
-Exergonic reactions proceeds with a net release of free energy
-Endergonic reactions absorbs free energy from its surroundings.
-Energy can be kenetic or potential.
-Kenetic: energy of motion. Ex: light and heat
-Potential: energy of position. Ex: arrangement or location.
-If it ends in –ase its an enzyme.
-Enzymes have three different inhibitors: competitive, noncompetitive and feedback.
These images may be helpful in better understanding the different inhibitors.
http://classes.midlandstech.com/carterp/Courses/bio225/chap05/05-07_EnzymeInhibit_1.jpg
http://classes.midlandstech.com/carterp/Courses/bio225/chap05/05-08_Feedback_1.jpg
Wednesday, October 24, 2007
AP Biology Lab 2: Enzyme catalysis
Hey class, this is the summary of todays lab and i hope you will understand the lab better after reading this blog entry.
Tuesday, October 23, 2007
Cellular Respiration Video
Mrs. Berkley
Monday, October 22, 2007
Class 10/22/07
first this is a video on cellular respiration done by kids in a AP Bio class in Vermont i think...
http://youtube.com/watch?v=FFBr3ANCkb4
glycolysis not only breaks down glucose but can accept a wide range of molecules such as polysaccharides and other forms of 6C sugars(galactose and fructose). The diffrent molecules would then be changed and broken down into glucose, then the process is continued.
main facts about glycolysis
it breaks 6c glucose into 2 3C pyruvates
forms net of 2 atps
and 2 NADH
krebs cycle yields
1 atp
3NADH
and 1 FADH2
*remember numbers produce in krebs cycle is multiplied by 2 because there are TWO pyruvates each going through the cycle.
one glucose can produce 36-38 ATPs