Oh by the way

Marvin is the new sherpa. muhahahahahaaaaaaa!!!! take that!

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.”

http://youtube.com/watch?v=stzq-KhzKb4

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

AP Biology Lab 2: Enzyme catalysis

Kamran posted this entry

Hey class, this is the summary of todays lab and i hope you will understand the lab better after reading this blog entry.

Enzymes catalyze reactios by lowering the activation energy necessary for a reaction to occur.

The molecule that an enzyme acts on is called the substrate. In an enzymatic reaction, the substrate changes and becomes into products but the enzyme molecule is unchanged after the reaction and it can continue to catalyze reactions over and over again.

In part 2: Test of Catalase activity, the enzyme that was used was the catalase, the substrate was H2O2 and the products came out to be water and Oxygen. When the catalase was added to the H2O2 solution oxygen bubbles started to form because catalase is an enzyme which speeded the reaction.

Although in the next step the catalase was increased but it was boiled causing the enzyme to change its shape and it became denatured so nothing happened. There were no oxygen bubbles observed. Also, in the last step of this part of the experiment, when the chicken liver was added to the H2O2 huge amount of Oxygen was released because alot of oxygen bubbles appeared. Here is a similar video of chicken liver and H2O2 being mixed.

http://www.coolschool.ca/lor/BI12/unit7/U07L04/tt2reaction.htm

So, from this part of the experiment it could be concluded that the living tissue produced the most oxygen and it had the fastest reaction rate.

For part 3, the purpose of the lab was to investigate the rate at which the enzyme catalase converts substrate to product. The catalase reacted with H2O2 for various amount of tie and then it was stopped by adding the H2SO4. So the remaining H2O2 needed to be measured so a titration with KMNO4 took place. Here is an overall image of the experiment.

In the overall results it could be concluded that as time passed the number of moles of product also increased.

well, thats it, i hope u guys learned something and hopefully it wasn't that boring. Ok now for the moment everyone has been waiting for, the next sherpa who will have the honor of leading us is............... Aerialle.

Cellular Respiration Video

Thank you Roxanne for this video. I believe it will help to elucidate the process of cellular respiration for your classmates. Thanks again,

Mrs. Berkley

oopppss

Oh yeah and the new sherpa will be, uhmmmm........


Kamran

Class 10/22/07

well...here goes nothing.

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

HI!!!!!!!!

hi Ms berkeley