Krebs Cycle Quiz ChallengeOnline version Test your knowledge of the Krebs cycle with these fun and challenging questions! by Janeth Sison 1 What is the primary purpose of the Krebs cycle? a To produce oxygen. b To produce energy in the form of ATP. c To synthesize glucose. d To break down fatty acids. 2 Where does the Krebs cycle occur in eukaryotic cells? a In the cytoplasm. b In the mitochondria. c In the nucleus. d On the ribosomes. 3 Which molecule enters the Krebs cycle after being converted from pyruvate? a Acetyl-CoA. b Glucose. c Lactate. d Oxaloacetate. 4 What is produced during one turn of the Krebs cycle? a 2 NADH, 2 FADH2, and 2 ATP. b 3 NADH, 1 FADH2, and 1 ATP. c 3 NADH, 0 FADH2, and 2 ATP. d 1 NADH, 2 FADH2, and 1 ATP. 5 Which enzyme catalyzes the conversion of citrate to isocitrate? a Succinate dehydrogenase. b Aconitase. c Fumarase. d Citrate synthase. 6 What is the final product of the Krebs cycle that regenerates oxaloacetate? a Alpha-ketoglutarate. b Malate. c Citrate. d Fumarate. 7 Which gas is released as a byproduct of the Krebs cycle? a Carbon dioxide. b Nitrogen. c Hydrogen. d Oxygen. 8 What is the role of FAD in the Krebs cycle? a To release carbon dioxide. b To produce ATP directly. c To convert glucose to pyruvate. d To accept electrons and form FADH2. 9 Which compound is formed when succinate is oxidized in the Krebs cycle? a Malate. b Citrate. c Oxaloacetate. d Fumarate. 10 How many times does the Krebs cycle turn for each glucose molecule? a Once. b Four times. c Three times. d Twice.
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