Welcome to the Quiz!
This quiz contains 13 questions from a mix of 1 subtopics.
How many molecules of reduced FAD are produced in the Krebs cycle for each acetyl CoA?
two
four
three
one
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How many molecules of reduced NAD are produced in the Krebs cycle for each acetyl CoA?
two
three
four
one
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What is the first step in the Krebs cycle?
citrate is dehydrogenated, reducing NAD and FAD
acetyl CoA merges with oxaloacetate to create citrate
citrate is decarboxylated, releasing carbon dioxide
ATP is synthesised via substrate-level phosphorylation
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How many carbon atoms does oxaloacetate have?
three
six
two
four
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Where does the Krebs cycle take place?
cytoplasm
endoplasmic reticulum
mitochondrial intermembrane space
mitochondrial matrix
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Which of the following is NOT a product of the Krebs cycle for each molecule of acetyl CoA?
reduced NAD
two molecules of carbon dioxide
two molecules of ATP
reduced FAD
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How many molecules of carbon dioxide are released during the Krebs cycle for each acetyl CoA?
three
two
four
one
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Which coenzyme is reduced in the Krebs cycle but not in the earlier stages of aerobic respiration?
ATP
NAD
FAD
NADP
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How does NAD differ from FAD in the way it is reduced?
there is no difference in how NAD and FAD are reduced
NAD accepts two hydrogens and two electrons, while FAD accepts an electron and a proton
NAD accepts only electrons, while FAD accepts only protons
NAD accepts an electron and a proton, while FAD accepts two hydrogens and two electrons
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Which of the following is NOT a reason why the Krebs cycle is important?
it continually regenerates the four-carbon compound to combine with acetyl CoA
it generates reduced NAD and reduced FAD for ATP production
it directly produces a large amount of ATP
it enables the complete oxidation and breakdown of large nutrients
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How many ATP molecules are synthesised directly via substrate-level phosphorylation in the Krebs cycle for each acetyl CoA?
three
four
two
one
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What is the role of coenzymes like NAD and FAD in the Krebs cycle?
to regenerate the four-carbon compound for the next turn of the cycle
to act as reducing agents, donating electrons and protons
to act as oxidising agents, accepting electrons and protons
to directly synthesise ATP
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What happens to the reduced coenzymes produced in the Krebs cycle?
they donate electrons to the electron transport chain in oxidative phosphorylation
they regenerate the four-carbon compound for the next turn of the cycle
they directly synthesise ATP
they are expelled as waste products
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