Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
Which of the following is NOT a product of the Krebs cycle for each molecule of acetyl CoA?
two molecules of carbon dioxide
two molecules of ATP
reduced NAD
reduced FAD
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How many molecules of carbon dioxide are released during the Krebs cycle for each acetyl CoA?
four
three
two
one
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Which coenzyme is reduced in the Krebs cycle but not in the earlier stages of aerobic respiration?
FAD
NADP
NAD
ATP
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How does NAD differ from FAD in the way it is reduced?
NAD accepts only electrons, while FAD accepts only protons
NAD accepts two hydrogens and two electrons, while FAD accepts an electron and a proton
there is no difference in how NAD and FAD are reduced
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 generates reduced NAD and reduced FAD for ATP production
it continually regenerates the four-carbon compound to combine with acetyl CoA
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?
two
four
three
one
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What is the role of coenzymes like NAD and FAD in the Krebs cycle?
to act as oxidising agents, accepting electrons and protons
to regenerate the four-carbon compound for the next turn of the cycle
to act as reducing agents, donating electrons and protons
to directly synthesise ATP
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What happens to the reduced coenzymes produced in the Krebs cycle?
they are expelled as waste products
they directly synthesise ATP
they donate electrons to the electron transport chain in oxidative phosphorylation
they regenerate the four-carbon compound for the next turn of the cycle
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What is the first step in the Krebs cycle?
a six-carbon compound is decarboxylated, releasing carbon dioxide
a six-carbon compound is dehydrogenated, reducing NAD and FAD
acetyl CoA merges with a four-carbon compound to create a six-carbon compound
ATP is synthesised via substrate-level phosphorylation
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Where does the Krebs cycle take place?
mitochondrial matrix
cytoplasm
mitochondrial intermembrane space
endoplasmic reticulum
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