BIOL 134 Lecture Notes - Lecture 12: Cellular Respiration, Citric Acid Cycle, Peptidoglycan
Document Summary
Cellular respiration produces much more energy per unit of glucose than fermentation. Simplicity: since no external electron carriers are needed, all that"s required is a fuel source (like glucose) Speed: since the system is so simple, more atp can be generated per second using fermentative metabolism. Yeast ferment even when oxygen is present! Only when there"s a large amount of sugar. By using fermentation, yeast can consume the energy source faster, keeping it away from competition. The waste product, ethanol, is more poisonous to most bacteria than it is to yeast. Yeast can still get energy out of than ethanol if there"s oxygen present. Carbohydrates: converted into glucose or some other intermediate step in glycolysis. Fats: made of glycerol and fatty acids. Fatty acids are broken down in 2 carbon chunks. Proteins: long chains of amino acids joined together: break down into amino acids, amino acids are deaminated (generates nh4+, results can be fed into glycolysis or the krebs cycle.
