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1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

2. Atoms & Elements

Isotopes

General Chemistry

2. Atoms & Elements

Isotopes

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Multiple Choice

Why did Hershey and Chase use the isotopes 32P and 35S in their experiments?

To distinguish between DNA and protein in bacteriophages.

To track the movement of electrons in chemical reactions.

To measure the rate of radioactive decay in cells.

To identify the presence of isotopes in living organisms.

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Verified step by step guidance

Understand the context of the Hershey and Chase experiment: They aimed to determine whether DNA or protein was the genetic material in bacteriophages.

Recognize that DNA contains phosphorus but not sulfur, while proteins contain sulfur but not phosphorus.

Identify the isotopes used: 32P (phosphorus-32) was used to label DNA, and 35S (sulfur-35) was used to label proteins.

Consider the purpose of using these isotopes: By using 32P and 35S, Hershey and Chase could track which component (DNA or protein) entered the bacterial cells during infection.

Conclude that the use of these isotopes allowed Hershey and Chase to distinguish between DNA and protein, confirming that DNA is the genetic material.