Study flash cards for exam # 3 October 30th, 2009
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Enzymes that transfer phosphate groupsd from one molecule to another are known qs phosphioreductases. T/F | False
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| Physiolof]gically irreversible reactions are those that proceed with a relatively large overall gain in energy? | False. The loss in energy is not enough energy to go back the other way.
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| The reactions of glycolosis occur only in specialized tissure sucj as the liver. | False
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| Pyruvate dehydrogenase is the enzyme that converts pyruvic acid to phospho-enol pyruvate. | False
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| The rates of enzyme catalyzed reactions are influnced by the temperature. | True
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| Moleculal oxygen is a stronger oxidizing agent than NAD+ | True
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| Glycolosis does not involve any oxidation-reduction reactions. | False
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| Lipoic acid is a B vitamin. | False.
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| Glucose can react directly with O2 to become CO2 and H20. | True
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| Occaasionaly, there are biological reactions where ATP gets hydrolyzed directly to AMP. | True
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| Anytime something gets oxidized, something else has to get reduced. | True
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| It is possible to have comkpetitive enzyme reducers. | False. They would have to go into the same spot as the substrate, therefore would not activate.
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| Carbohydrates contain morfe energy than fats becausew they are more oxidized. | False.
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| In mammalian cells, lactic acid can't be oxidized under anaerobic conditions. | True
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| The TCA cycle can be thought of as the central core of metabolism. | True
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| The TCA cycle can be thought of as the central core of metabolism. | Ture
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| Un-catalyzed chemical reaction rates get faster as the temperature is increased. | Ture
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| The manufacturers of Theragram M claim that this multi-B vitamin product helps to "unlocl" the enwegy of your food. This claim is metabolically valid. | True
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| Five coenzymes, or cofactors, are required to convert alpha keto glutarate to succinyl CoA. | True. TPP, Lipoic Acid, CoA, FAD and NAD+
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| Enzyme catalyzed reactions get faster in direct proportion to the concentration of substrate. | False. Should be [E].
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| Dehydrogenases are enzymes that catalyze the transfer of electrons from one molecule to another. | True
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| Anaerobic metabolism and be damaging to a cell. | Ture
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| Increasing the reaction temperature of a chemical reaction makes activation energy for that reaction more readily available. | True
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| Most, if not all, of the water, when glucose is oxidized to CO2 and H2O, is produced in the TCA cycle. | False
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| Body stores of carbohydrates are sufficient to meet the needs of the body for caloric energy for about 3 months. | False
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| Non-competitive inhibitors of enzymes inhibit the enzyme by binding to an inhibitor binding fite on the enzyme that is different from the substrate binding site (active site). | True
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| Pyruvate dehydrogenenase is a multi-enzyme complex. | True
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| The TCA cycle is shysiologically reversible. | False
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| ATP contains a B vitamin as part of its structure. | False
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| Co-enzymes are proteins | False
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| Oxidative phosphorylationj is a membrane transport process. | True
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