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

1. A Review of General Chemistry

Intro to Organic Chemistry

Organic Chemistry

1. A Review of General Chemistry

Intro to Organic Chemistry

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Multiple Choice

Why are short tandem repeats (STRs) useful in DNA profiling?

They are highly variable between individuals, allowing for unique identification.

They are identical in all individuals, providing a consistent reference point.

They are found only in coding regions of DNA, making them easy to analyze.

They degrade quickly, ensuring that only recent samples can be profiled.

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Verified step by step guidance

Understand the concept of Short Tandem Repeats (STRs): STRs are sequences in the DNA where a short nucleotide sequence is repeated multiple times. These sequences are found in non-coding regions of the DNA.

Recognize the variability of STRs: STRs are highly polymorphic, meaning the number of repeats can vary significantly between individuals. This variability is what makes them useful for DNA profiling.

Consider the uniqueness of STR patterns: Because the number of repeats in STRs can differ from person to person, they provide a unique genetic fingerprint for each individual, which is crucial for identification purposes.

Evaluate the role of STRs in forensic science: STRs are used in forensic science to match DNA samples from crime scenes with potential suspects, as the likelihood of two individuals having the same STR pattern is extremely low.

Clarify misconceptions: STRs are not found only in coding regions, nor do they degrade quickly. Their presence in non-coding regions and stability over time make them reliable markers for DNA profiling.