CELL RESPIRATION
THE KREBS CYCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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glucose
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Amino Acids and nucleic Acids
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Carbohydrates and lactic acid
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Pentoses
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Detailed explanation-1: -Fuel for the Krebs cycle comes from lipids (fats) and carbohydrates, which both produce the molecule acetyl coenzyme-A (acetyl-CoA). This acetyl-CoA reacts in the first step of the eight step sequence of reactions that comprise the Krebs cycle, all of which occur inside mitochondria of eukaryotic cells.
Detailed explanation-2: -Alpha-ketoglutarate (alpha-ketoglutaric acid) is used in the synthesis of various amino acids like the glutamate.
Detailed explanation-3: -The citric acid cycle also produces CO2, the precursors for several amino acids (aspartate, asparagine, glutamine, proline) and NADH – all of which are used in other important metabolic pathways, such as amino acid synthesis and oxidative phosphorylation (OxPhos).
Detailed explanation-4: -The Krebs cycle is used by organisms that respire (as opposed to organisms that ferment) to generate energy, either by anaerobic respiration or aerobic respiration. In addition, the cycle provides precursors of certain amino acids, as well as the reducing agent NADH, that are used in numerous other reactions.