Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

29. Amino Acids

Proteins and Amino Acids

Organic Chemistry

29. Amino Acids

Proteins and Amino Acids

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Multiple Choice

How did Hershey and Chase use radioactivity to determine whether proteins or DNA were the genetic material?

They labeled DNA with radioactive sulfur and proteins with radioactive phosphorus.

They labeled both DNA and proteins with radioactive carbon.

They used radioactive nitrogen to label both DNA and proteins.

They labeled proteins with radioactive sulfur and DNA with radioactive phosphorus.

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Verified step by step guidance

Understand the context: Hershey and Chase conducted experiments to determine whether DNA or proteins were the genetic material in cells.

Identify the key components: Proteins contain sulfur, while DNA contains phosphorus. This distinction is crucial for labeling.

Labeling strategy: Hershey and Chase used radioactive isotopes to label the components. They labeled proteins with radioactive sulfur (\(^{35}\text{S}\)) because sulfur is present in proteins but not in DNA.

Labeling DNA: They labeled DNA with radioactive phosphorus (\(^{32}\text{P}\)) because phosphorus is present in DNA but not in proteins.

Analyze the results: After allowing the bacteriophages to infect bacteria, they observed which radioactive label entered the bacterial cells, concluding that DNA was the genetic material because the radioactive phosphorus was found inside the cells.