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difference between glycolysis and krebs cycle

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Question:What I would like to know is this: why are there so many enzymes in glycolysis and the Krebs cycle? I know about HOW many enzymes are involved in the process but don't understand the necessity of so many. Thanks!

Answers:First off, if glucose was broken down to CO2 and H2O in one step, it would take place too quickly and all the energy would not be able to be collected. We want a controlled reaction where we can slowly break down the glucose and pick up as much of the energy as possible. That being said, we need an enzyme for every little step of breaking down the glucose molecule. Enzymes will only mediate one reaction, thus many enzymes are needed to mediate the many different steps in the full breakdown of glucose.

Question:Can anyone help please? What are the types of molecules produced in glycolysis, Krebs cycle, and Alcoholic fermentation?? PLease if anyone has a clue I would really appreciate it.

Answers:piruvate, etanhol and CO2

Question:For Glycolysis I will need to draw, memorize and explain each step (1 to 10) of glycolysis For Pyruvate Oxidation & Krebs Cycle I will need to draw and explain the Pyruvate and mitochondria cycle, Kreb cycle and hydrogen ions, ATP, ADP and so on... I feel that I can totally master Glycolysis, what do you guys think?

Answers:For me, glycolysis is easier to remember.

Question:I know that glycolysis does not need oxygen, but what about Krebs cycle?

Answers:Though the Krebs cycle does not directly require oxygen, it can only take place when oxygen is present because it relies on by-products from the electron transport chain, which requires oxygen. The Krebs cycle is therefore an aerobic process.

From Youtube

Biology: Glycolysis and the Krebs Cycle :www.mindbites.com for full video

The Citric Acid Cycle (Krebs Cycle) :The citric acid cycle - also known as the tricarboxylic acid cycle (TCA cycle), the Krebs cycle, or the Szent-Gy rgyi-Krebs cycle - is a series of enzyme-catalysed chemical reactions, which is of central importance in all living cells that use oxygen as part of cellular respiration. In eukaryotic cells, the citric acid cycle occurs in the matrix of the mitochondrion. The components and reactions of the citric acid cycle were established by seminal work from Albert Szent-Gy rgyi and Hans Krebs. In aerobic organisms, the citric acid cycle is part of a metabolic pathway involved in the chemical conversion of carbohydrates, fats and proteins into carbon dioxide and water to generate a form of usable energy. Other relevant reactions in the pathway include those in glycolysis and pyruvate oxidation before the citric acid cycle, and oxidative phosphorylation after it. In addition, it provides precursors for many compounds including some amino acids and is therefore functional even in cells performing fermentation. More info: Spongelab Biology: www.spongelab.com/biology