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

3. Acids and Bases

Organic Chemistry Reactions

Organic Chemistry

3. Acids and Bases

Organic Chemistry Reactions

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Multiple Choice

In the context of organic chemistry reactions, the binding of which complex increases the ability of RNA polymerase to transcribe the lac operon?

cAMP-CAP complex

LacZ-LacY complex

RNA polymerase-DNA complex

Lac repressor-operator complex

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Verified step by step guidance

Understand the lac operon: The lac operon is a set of genes involved in lactose metabolism in E. coli. It is regulated by the presence or absence of lactose and glucose.

Identify the role of cAMP-CAP complex: The cAMP-CAP complex is a regulatory protein that binds to the promoter region of the lac operon, enhancing the binding of RNA polymerase and increasing transcription.

Consider the effect of glucose: When glucose levels are low, cAMP levels increase, leading to the formation of the cAMP-CAP complex, which facilitates the transcription of the lac operon.

Evaluate other complexes: The LacZ-LacY complex refers to proteins encoded by the lac operon, not regulatory elements. The RNA polymerase-DNA complex is necessary for transcription but is not specific to the lac operon regulation. The Lac repressor-operator complex inhibits transcription in the absence of lactose.

Conclude the role of cAMP-CAP: The cAMP-CAP complex is crucial for the positive regulation of the lac operon, especially in the absence of glucose, by enhancing RNA polymerase's ability to initiate transcription.