Citric Acid Cycle
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What is the first molecule that feeds into the citric acid cycle? | Acetyl-CoA
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| How many NADH and FADH are produced from one acetyl-CoA entering the citric acid cycle? | 3 NADH and 1 FADH
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| How many ATP are produced from 1 glucose? | 28 ATP
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| How many ATP can be made without the reactions occurring in the mitochondria? | 2 ATP
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| What is a source of oxaloacetate (other than malate) in the liver? | Aspartate
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| What enzyme catalyzes PEP from oxaloacetate? | PEP carboxylase
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| How does alanine eventually end up in the citric acid cycle? | Alanine is converted to pyruvate and then acetyl-coA
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| What citric acid cycle component is glutamate synthesized from? | Alphaketoglutarate
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| Why are acetyl-CoA, fatty acids, citrate and succinyl-CoA negative regulators of the citric acid cycle? | These products regulate by feedback inhibition
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| Why is ATP a negative regulator, while ADP and AMP are positive regulators? | High concentration of ADP and AMP indicate that the cell is out of energy
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| In what cell is Ca2+ a regulator? | Muscle
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| What fungus produces large quantities of citric acid to be used as an additive for food? | Aspergillus Niger
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| Which Citric acid cycle intermediate is used for heme synthesis? | Succinyl-CoA
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| What is the purpose of citric acid addition to food? | It is an antioxidant used to preserve food flavor
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| How many negatively charged carboxyl groups does citrate have? | 3
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| What metal can citrate bind? | Aluminum
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| When the pH of soil is less than 5.0, is aluminum soluble or insoluble? | Soluble- it is the Al+3 form
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| When the pH of soil is alkaline, is aluminum soluble or insoluble? | Insoluble- it is in the Al(OH)3 form
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| What happens to food crops when soil is high in aluminum and low in pH? | The plants take up the soluble aluminum which inhibits their growth
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| How can increasing the secretion of citric acid help plants grow in certain soil conditions? | Citric acid could potentially bind the Al+3 and prevent it from being taken up by the cells
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Created by:
bettyboucher
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