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.
Blog for 10/20/20 Lecture:
1st law of thermodynamics: Energy is converted from one form to another.
Stores energy:
Energy starts in nutrients, and then gets stored in electrons.
Redox reactions – OIL RIG
1) Oxidized when it loses an electron
2) Reduced when it gains an electron
Carbohydrates ** Check is your notes***
Glucose (C-H bonds) to 6CO2; it is an exergonic reaction; -686 kcal/mol
2nd law of thermodynamics: Entropy (randomness) increases with every reaction
2 ways to make ATP
1) Substrate level phosphorylation – 4 ATP
2) Chemiosmosis
Cellular Respiration – a way for cells to harvest energy; a way for living cells to obtain energy from organic molecules; the primary aim is to make ATP and NADH.
1) Aerobic respiration uses oxygen
2) Focus on glucose but other organic molecules are used
3) Make energy intermediates so they can drive endergonic reactions
The process steps are:
1) Glycolysis
2) Breakdown of pyruvate to an acetyl group
3) Citric acid cycle
4) Oxidative phosphorylation
The cytosol can produce about 2 ATP per glucose molecule but the mitochondria can produce about 30-36 ATP per glucose molecule. Hence, mitochondria is known as the powerhouse of the cell.
Blog for 10/22/10
Cellular Respiration (cont)
At the end of clycolysis, pyruvates are formed. There are two ways to make ATP. the way used after glycolysis is substrate-level phosphorylation. Pruvate is pyruvic acid becuase it has a carboxyl group which is negative and therefore an acid.
Redox reactions are exergonic.
Kinases and dehydrogenases add and release energy!! They are important enyzmes!
Oxygen is not needed for glycolysis but it is needed ino ther steps:
If there is oxygen, puruvates taken to mitochondria, Acetyl CoA production and continues to Citric Acid Cycle
NADH has a lot of potential energy
Carbon Dioxide is produced as waste
Citric Acid Cycle
gets rid of the rest of the potential energy
3 steps
1) Metabolic cycle
2) Acetyl is removed adn added to oxaloacetate to form citrate/citric acid
3) didn't get this one during lecture
The cycle begins and ends with oxaloacetate.
CoA group helps preserve energy (decreases the amount of heat that is released/lost)
By the end of the cycle:
6 NADH
2 FADH2
2 ATP
4 CO2 (later there is a total of 6 CO2?)
***Glycolysis occurs in the cytoplasm and the citric acid cycle occurs in the mitochondria.
Blog for 10/27/10 Lecture (submitted 10/27/10) :
We continued to learn about and review Cellular Respiration.
Blog for 10/29/10 Lecture:
Oxygen is limiting
O2 is final electron acceptor in the electron transport chain, but if Oxygen is absent then the chain gets backed up. NADH accumulates and NAD+ depletes
NAD+ is needed to oxidize other molecules
glycoysis, breakdown of puruvate, and citric acid cycle decreases
glucose builds up as well as fats and proteins
ATP is depleted.
Cell density - too many cells/mass
Cancer cells favor glycolysis over oxidative phosphorylation (Warburg - genes)
Good cure - inhibiting glycolysis but it would affect all cells and reduce ATP production (BAD!!!)
OXIDANTS - incompletely reduced species O2
catalase breaks down H2O2
Anaerobic Respiration/Fermentation
glycolysis in both
fermentation does not include electron trasport chian or citric acid cycle (is not always carried out)
Anaerobic respiration occurs when you are exercising and not enough O2 is brought in
A lot of energy is lost as heat
Build up of lactric acid causes fatigue and soreness
*** Bacteria have their electron transport chain in their plasma membrane
Blog for 11/4/10 Lecture
REVIEW FOR THE EXAM
Celllular Respiration Song (submitted 10/18/10)
This song provides an interesting take on describing the process of Cellular Respiration. It is the song "I've Got a Feeling" but with different lyrics and sung by a high school biology teacher. However, I am sure that Dr. Weber has a better singing voice...Haha. It describes all the steps of Cellular Respiration including Glycolysis, the pyruvate, the Kreb's cycle, and Oxidative Phosphorylation. It's a catchy song and once heard enough times, the steps are easily memorized.
Cellular Respiration (submitted 10/24/10:
I like this web site a lot because it thoroughly explains the process of Cellular Respiration while including description diagrams/pictures. I like how it breaks down the process and almost goes "slide by slide" or "concept by concept" so that you make sure you understand one step before moving onto the next. This website really helps!!
Journal Article: Cellular Respiration (submitted 10/24/10):
This article talks about the cell cycle which is also known as cellular respiration. It talks about how there are possibilities that cellular respiration can be linked to multiple diseases or malfunctions if it is not carried out properly. Maintaining the intracellular and extracellular enivronments of a cell are very important for the survival of eukaryotic cells. Recent findings have shown scientists that certain drugs? can be used as a homeostatic mechanism (good for the cell).
Potential and Kinetic Energy (submitted 11/4/10):
The above video gives some good examples of Kinetic and Potential energy (including the rubberband example!) in order to explain the differences between the two types of energy.