Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

3. Energy & Cell Processes

Enzymes

Anatomy & Physiology

3. Energy & Cell Processes

Enzymes

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Multiple Choice

Which enzyme's activity is regulated by the levels of glucose-6-phosphate and fructose-6-phosphate in the cell?

Phosphofructokinase-1

Hexokinase

Aldolase

Pyruvate kinase

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Verified step by step guidance

Understand the role of each enzyme listed in the context of glycolysis, the metabolic pathway where glucose is broken down to produce energy.

Phosphofructokinase-1 (PFK-1) is a key regulatory enzyme in glycolysis. It catalyzes the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate, and its activity is influenced by the levels of certain metabolites, including glucose-6-phosphate and fructose-6-phosphate.

Hexokinase is another enzyme in glycolysis that catalyzes the phosphorylation of glucose to glucose-6-phosphate. Its activity is not directly regulated by glucose-6-phosphate and fructose-6-phosphate but rather by its product, glucose-6-phosphate, through feedback inhibition.

Aldolase is an enzyme that catalyzes the cleavage of fructose-1,6-bisphosphate into two three-carbon molecules, glyceraldehyde-3-phosphate and dihydroxyacetone phosphate. Its activity is not directly regulated by glucose-6-phosphate or fructose-6-phosphate.

Pyruvate kinase catalyzes the final step of glycolysis, converting phosphoenolpyruvate to pyruvate. Its regulation is more related to the energy status of the cell rather than the levels of glucose-6-phosphate or fructose-6-phosphate.