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 40m
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

Which of the following reactions is a key step in the Calvin Cycle?

Carboxylation of ribulose-1,5-bisphosphate

Hydrogenation of ethene

Dehydration of alcohols

Oxidation of alkanes

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Verified step by step guidance

Understand the Calvin Cycle: The Calvin Cycle is a series of biochemical reactions that occur in the chloroplasts of photosynthetic organisms. It is part of the process of photosynthesis and is responsible for the fixation of carbon dioxide into organic molecules.

Identify the key reaction in the Calvin Cycle: The Calvin Cycle involves several steps, including carbon fixation, reduction, and regeneration of ribulose-1,5-bisphosphate. The key step is the carboxylation of ribulose-1,5-bisphosphate, which is the fixation of CO₂.

Carboxylation of ribulose-1,5-bisphosphate: This reaction involves the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO), which catalyzes the addition of CO₂ to ribulose-1,5-bisphosphate, forming 3-phosphoglycerate.

Compare with other reactions: Hydrogenation of ethene, dehydration of alcohols, and oxidation of alkanes are not part of the Calvin Cycle. These reactions are typical in organic chemistry but do not relate to the biochemical processes of photosynthesis.

Conclude the key step: The carboxylation of ribulose-1,5-bisphosphate is the correct answer as it is the essential step in the Calvin Cycle for carbon fixation.