by Devi Fontana
Dive into the intricacies of the Krebs Cycle, where each turn of the cycle plays a vital role in cellular respiration and energy production. This quiz will test your grasp on the various steps, enzymes, and molecules involved in this fundamental biochemical pathway. Sharpen your knowledge and see how well you understand the processes that fuel life at the cellular level. Good luck!
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Krebs Cycle Quiz Questions Overview
1. What is the primary purpose of the Krebs Cycle?
To produce glucose
To generate ATP and electron carriers
To synthesize proteins
To break down fatty acids
2. Which molecule enters the Krebs Cycle?
Glucose
Acetyl-CoA
Lactic acid
Citric acid
3. Where in the cell does the Krebs Cycle take place?
Cytoplasm
Nucleus
Mitochondrial matrix
Endoplasmic reticulum
4. Which enzyme catalyzes the first step of the Krebs Cycle?
Hexokinase
Citrate synthase
ATP synthase
Pyruvate dehydrogenase
5. How many molecules of CO2 are produced per turn of the Krebs Cycle?
1
2
3
4
6. Which molecule is regenerated at the end of the Krebs Cycle?
Citrate
Oxaloacetate
Succinate
Fumarate
7. How many NADH molecules are produced per turn of the Krebs Cycle?
1
2
3
4
8. Which of the following is NOT a product of the Krebs Cycle?
ATP
NADH
FADH2
Glucose
9. Which intermediate is formed after citrate in the Krebs Cycle?
Isocitrate
Succinate
Malate
Fumarate
10. Which enzyme converts succinate to fumarate in the Krebs Cycle?
Succinate dehydrogenase
Fumarase
Malate dehydrogenase
Aconitase
11. How many ATP (or GTP) molecules are produced directly per turn of the Krebs Cycle?
1
2
3
4
12. Which molecule is a competitive inhibitor of succinate dehydrogenase?
Malonate
Oxaloacetate
Citrate
Fumarate
13. Which of the following statements about the Krebs Cycle is true?
It occurs in the cytoplasm
It produces oxygen
It generates reduced electron carriers
It directly produces large amounts of ATP
14. Which intermediate is formed after alpha-ketoglutarate in the Krebs Cycle?
Citrate
Succinate
Succinyl-CoA
Malate
We recommend that you do not leave the page that you are taking this quiz in. Stay honest 🙂
