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

Acids and Bases

Organic Chemistry

3. Acids and Bases

Acids and Bases

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Multiple Choice

In the context of acids and bases, why is the lacI gene expressed without the help of an activator like CRP?

The lacI gene expression is dependent on the presence of glucose.

The lacI gene is constitutively expressed, meaning it is always active without needing an activator.

The lacI gene is activated by the presence of lactose, which acts as an inducer.

The lacI gene requires a high pH environment to be expressed.

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Verified step by step guidance

Understand the role of the lacI gene: The lacI gene encodes the lac repressor protein, which regulates the lac operon by binding to the operator region and preventing transcription in the absence of lactose.

Recognize the concept of constitutive expression: A gene that is constitutively expressed is always active, meaning it is transcribed continuously without the need for additional regulatory proteins or activators.

Identify the conditions affecting lacI expression: The lacI gene is not influenced by the presence of glucose or the pH environment. Instead, it is always expressed to produce the repressor protein.

Differentiate between the roles of inducers and activators: Lactose acts as an inducer by binding to the lac repressor, causing it to release from the operator and allowing transcription of the lac operon. This is different from an activator, which would enhance transcription directly.

Conclude that the lacI gene does not require an activator like CRP because it is constitutively expressed, ensuring the constant production of the lac repressor protein to regulate the lac operon.