citric acid cycle

citric acid cycle - I. Cellular Respiration: breaking down...

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

View Full Document Right Arrow Icon
I. Cellular Respiration: breaking down sugar in the presence of oxygen (aerobic). Photosynthesis (you recall. ..) is the process by which CO 2 and H 2 O are used to make sugars and starches. During Cellular Respiration , sugar is broken down to CO 2 and H 2 O, and in the process, ATP is made that can then be used for cellular work. The overall reaction for cellular respiration: (does this reaction look familiar? Overall, it is the reverse reaction of photosynthesis, but chemically, the steps involved are very different.) C 6 H 12 O 6 + 6O 2 -------------------> 6CO 2 + 6H 2 O + ~38 ATP Whereas only photosynthetic cells can make sugar using photosynthesis, ALL cells need to be able to break down sugars they take in from their environment and turn it into energy to be used in cellular work. ... II. Cellular respiration can be broken down into 4 stages : Essentially, sugar (C 6 H 12 O 6 ) is burned, or oxidized , down to CO 2 and H 2 O, releasing energy ( ATP ) in the process. Why do cells need ATP? ALL cellular work -all the activities of life - requires energy, either from ATP or from related molecules. A lot of oxygen is required for this process! The sugar AND the oxygen are delivered to your cells via your bloodstream. This process occurs partially in the cytoplasm, and partially in the mitochondria. The mitochondria is another organelle in eukaryotic cells. like the chloroplast, the mitochondria has two lipid bilayers around it, and its own genome (indicating that it may be the result of
Background image of page 1

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

View Full DocumentRight Arrow Icon
endosymbiosis long ago). In some ways similar to the chloroplast, the mitochondria also has two main sites for the reactions: The matrix , a liquidy part of the mitochondrion, and the christae , the folded membranes in the mitochondrion. 1: Glycolysis ("splitting of sugar"): This step happens in the cytoplasm. One Glucose (C6H12O6) is broken down to 2 molecules of pyruvic acid . Results in the production of 2 ATPs for every glucose. (page 113 of your book goes into painful detail about this process, but all YOU need to know is that glucose is split into to 2 molecules of pyruvate!) 2: Transition Reaction:
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 01/18/2011 for the course BIO 20064 taught by Professor Devois during the Spring '09 term at Jefferson College.

Page1 / 5

citric acid cycle - I. Cellular Respiration: breaking down...

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