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Chapter 7 Blog: Cellular Respiration, Fermentation, and Secondary Metabolism (Kimberley)

Page history last edited by KimberleyHausheer 13 years, 7 months ago

In the first section of this page, you will write a daily summary of that day's class.  For example in  your chapter 2 blog, your first entry should be titled 9/3/10.  You should then write a one or two paragraph summary of that day's lecture, outlining the major points.  In the second section, you are required to add two items (link to a website, video, animation, student-created slide show, student-created PowerPoint presentation) and one journal article pertaining to a topic in this chapter.  A one-paragraph summary must accompany each item describing the main idea and how it applies to the lecture topic.  Please see the PBWorks help guide for assistance embedding video and other items directly in the page.  I will also produce a how-to video on using tables to wrap text around items and other useful tips.  Please see the syllabus for organization and grading details.


A.  Daily Blog


10/20/10- Yesterday we finished up the end of Chapter 6 and started Chapter 7. We were started to learn about cellular respiration, which is the processby which living cells obtain energy from organic molecules.  But because cellular respiration is a very complex process we mainly focused on glycolysis, which is the first ten steps. We learned about energy intermediates. We also learned that enzymes are not too hard to memorize if you know what the different parts of the name means.


10/22/10-Main Topic: Citric Acid Cycle


First we reviewed and finished up learning about glycolysis. Then we moved onto the Citric Acid Cycle which occurs in the mitochondrial matrix. It starts off with two pyruvates. Each pyruvate is broken down individually, so the net gain is the total of two turns through the cycle. Two turns of the citric acid cycle produces 2 ATP, 6 NADH, 2 FADH2, and 4 CO2.  


10/27/10- Main Topic: Aerobic Respiration


Dr. Weber first reviewed the process of cellular respiration. Then we went onto go over the process of aerobic respiration. The main characteristic of aerobic respiration and the reason for its name is because it uses oxygen. Oxygen is very electronegative consequently it works well as the last electron acceptor in the electron transport chain. The electron transport chain is an important step because without it, the reaction would occur simultaneously, instead of being broken down into step and most of the energy would be lost as heat instead of being stored in  energy intermediates. In the electron transport chain there are three enzymes, NADH dehydrogenase, Cytochrome BCI, and cytochrome oxidase. After the chain is a channel protein called ATP synthase that brings H+ ions back into the matrix and in doing so created ATP.


10/29/10-Main Topics: How cells deal with a lack of oxygen and Anaerobic Respiration


Oxygen, as we have learned, is the last electron acceptor in the electron transport chain. If oxygen is absent, then NADH accumulates and less NAD+ is made. Without enough NAD+, all the other processes of cellular respiration are affected. This causes a build up of fats and proteins because they are not being broken down and a lack of ATP because it is not being produced. Oxidants are incompletely reduced oxygen species.




B.  Useful Materials


Citric Acid Cycle - This is a great website that is a video/animation that goes through the different stages of the Citric Acid Cycle. I love it because it gives me something to look at and is more interesting than reading it over in the book.


Spark Notes-I know probably everyone is familiar with spark notes and how they can put the most confusing books into plain words. Well surprise! Apparently they also have a science section. If you want to review or if you are completely lost you can check out this page. It is short and brief and hits all the steps.


Turning On A Fuel Switch of Cancer In class we talked about how cancer cells prefer aerobic glycolysis to oxidative phosphorylation even though it produces less energy because they do not have a lot of oxygen. This article explains how that they discovered what exactly makes the cancer cells different that they undergo a different process. The article abstract was written in terms that I actually understood. However the author discussed splicing a lot which I havn't heard of before. But at the end of the article it says that the tag that they discovered proves how protein coding plays a major role in tomorigenesis, which is what we learned about in the last section.


Comments (1)

Derek Weber said

at 2:55 am on Oct 26, 2010

10/25: Updated.

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