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

Introduction to Cellular Respiration

Anatomy & Physiology

3. Energy & Cell Processes

Introduction to Cellular Respiration

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1:27 minutes

Problem 6

Textbook Question

If you were to expose cells that are undergoing aerobic respiration to a radioactive oxygen isotope in the form of O2, which of the following molecules would you expect to be radiolabeled?a. pyruvateb. waterc. NADHd. CO2

Verified step by step guidance

Understand that aerobic respiration involves the consumption of oxygen (O2) and the production of carbon dioxide (CO2) and water (H2O).

Recall that during aerobic respiration, oxygen is the final electron acceptor in the electron transport chain.

Recognize that the oxygen molecule (O2) is used to form water (H2O) at the end of the electron transport chain.

Consider that the radioactive oxygen isotope in O2 would be incorporated into the water molecules produced.

Conclude that the molecule expected to be radiolabeled is water (H2O).

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Aerobic Respiration

Aerobic respiration is a metabolic process in which cells convert glucose and oxygen into energy, carbon dioxide, and water. This process occurs in several stages, including glycolysis, the Krebs cycle, and the electron transport chain, where oxygen is the final electron acceptor. Understanding this process is crucial for determining how oxygen isotopes are incorporated into cellular molecules.

Isotope Labeling

Isotope labeling involves using a variant of an element that has a different number of neutrons, making it detectable through various methods. In this context, a radioactive oxygen isotope (e.g., O-18) can be tracked as it is incorporated into different molecules during metabolic processes. This technique helps identify which molecules are produced or consumed during aerobic respiration.

Metabolic Products of Aerobic Respiration

The main metabolic products of aerobic respiration include carbon dioxide (CO2), water (H2O), and energy-rich molecules like NADH. During the process, oxygen is used to oxidize substrates, leading to the formation of these products. Identifying which of these molecules would be radiolabeled helps in understanding the pathways and transformations occurring during respiration.