Understanding the Krebs Cycle

What is the primary purpose of the Krebs Cycle in cellular respiration?

• To produce glucose

• To generate ATP directly

• To produce electron carriers for the electron transport chain

• To break down fatty acids

Which molecule enters the Krebs Cycle to combine with oxaloacetate, forming citrate?

• Pyruvate

• Acetyl-CoA

• Glucose

• NADH

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NGSS.HS-LS1-7

How many molecules of ATP are directly produced in one turn of the Krebs Cycle?

• 1

• 2

• 4

• 6

Which of the following is NOT a product of the Krebs Cycle?

• NADH

• Glucose

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NGSS.HS-LS1-7

• 1

• 2

• 3

• 4

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NGSS.HS-LS1-7

NGSS.HS-LS2-3

• They are used to synthesize glucose

• They transport electrons to the electron transport chain

• They are converted into ATP directly

• They are stored as energy reserves

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NGSS.HS-LS2-3

NGSS.HS-LS2-5

In the electron transport chain, what is the final electron acceptor?

• NADH

• Oxygen

• Water

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NGSS.HS-LS1-7

Approximately how many ATP molecules can be produced from one molecule of glucose through aerobic respiration?

• 12

• 24

• 36

• 38

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NGSS.HS-LS1-7

NGSS.HS-LS2-3

Which enzyme catalyzes the conversion of citrate to isocitrate in the Krebs Cycle?

• Citrate synthase

• Aconitase

• Isocitrate dehydrogenase

• Succinate dehydrogenase

What is the significance of the electron transport chain in cellular respiration?

• It directly produces glucose

• It generates a proton gradient to drive ATP synthesis

• It breaks down fatty acids

• It stores energy in the form of glycogen

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NGSS.HS-LS1-7

NGSS.HS-LS2-3