Lecture 10 Notes - Cellular Respiration: How I Turn Into...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Cellular Respiration: How I Turn Into Available Energy (ppt Clicker Question) The answer is A. Recall that the small intestines is the major site where nutrients are absorbed. Fetal Pig Dissections (ppt Series) Use this series of slides as an illustration of what you’ll do in lab 2. p Slides help to highlight what you should be thinking about during dissections. (ppt) Cells differ due to specialization of function. However Cell Respiration is used to burn carbohydrates to form ATP {the energy molecule used to fuel the life functions of a cell}. General “Primer” for Cell Respiration: Rather that write a narrative for each ppt slide, I’ll use the following to summarize the main concepts of Randy’s lecture today Then you should review the history of discovery using Randy’s slides. How do living things (or single cells) harvest energy from nutrients? As we said previously, ATP is involved. Of the millions of ATP molecules in many cells, about half are used every second to provide energy (the phosphate bonds are broken). Therefore, ATP must be continually recycled or else it will be used up in two seconds. The question becomes how is energy from organic nutrient molecules bound to ATP and how does ATP transfer energy? RECALL: The energy in ATP (adenosine triphosphate) is bound in the phosphate groups. Removing the outer phosphate group (remember, there are three) will yield kilocalories of usable energy [ATP à ADP]. In contrast energy is required to put a phosphate back onto the molecule [ADP à ATP] back onto the molecule. This process of adding phosphates to molecules is called phosphorylation . And it costs energy to carry it out. The transfer of energy that occurs when an ADP molecule is phosphorylated involves a flow of electrons (like an electric current) and is handled by special energy carrier molecules. One of the important types of energy carrier molecules used during cell respiration is NADH & NAD + [Vit B3, also called Niacin] , you don’t need to know the others for this class. 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
The transfer of electrons mentioned above is called an oxidation-reduction reaction . Oxidation is the removal of electrons from a molecule, which increases the net charge on the molecule (by removing negatively-charged electrons, the molecule becomes more positive). Reduction is the
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/24/2007 for the course BIO G 110 taught by Professor Wayne,r. during the Spring '07 term at Cornell University (Engineering School).

Page1 / 5

Lecture 10 Notes - Cellular Respiration: How I Turn Into...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online