Table of contents

1. Introduction to Genetics51m
2. Mendel's Laws of Inheritance3h 37m
3. Extensions to Mendelian Inheritance2h 41m
4. Genetic Mapping and Linkage2h 28m
5. Genetics of Bacteria and Viruses1h 21m
6. Chromosomal Variation1h 48m
7. DNA and Chromosome Structure56m
8. DNA Replication1h 10m
9. Mitosis and Meiosis1h 34m
10. Transcription1h 0m
11. Translation58m
12. Gene Regulation in Prokaryotes1h 19m
13. Gene Regulation in Eukaryotes44m
14. Genetic Control of Development44m
15. Genomes and Genomics1h 50m
16. Transposable Elements47m
17. Mutation, Repair, and Recombination1h 6m
18. Molecular Genetic Tools19m
- Genetic Cloning
  9m
- Methods for Analyzing DNA
  9m
19. Cancer Genetics29m
- Overview of Cancer
  21m
- Cancer Mutations
  7m
20. Quantitative Genetics1h 26m
21. Population Genetics50m
- Hardy Weinberg
  19m
- Allelic Frequency Changes
  31m
22. Evolutionary Genetics29m

7. DNA and Chromosome Structure

DNA Structure

Genetics

7. DNA and Chromosome Structure

DNA Structure

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Multiple Choice

Chargoff's rules states that which nucleotide pairings occurred?

A and G, C and T

T and U, C and G

G and U, C and A

A and T, C and G

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Verified step by step guidance

Understand Chargaff's rules: These rules state that in a DNA molecule, the amount of adenine (A) is equal to thymine (T), and the amount of cytosine (C) is equal to guanine (G). This is due to the base pairing nature of DNA.

Recognize the base pairing: In DNA, adenine pairs with thymine through two hydrogen bonds, and cytosine pairs with guanine through three hydrogen bonds. This complementary base pairing is crucial for the structure and function of DNA.

Identify the correct nucleotide pairings: Based on Chargaff's rules, the correct pairings are A with T and C with G. This ensures the DNA strands are complementary and can form the double helix structure.

Eliminate incorrect options: Review the given options and eliminate those that do not match the base pairing rules. For example, A and G, C and T do not follow Chargaff's rules.

Confirm the correct answer: After eliminating incorrect options, confirm that the correct nucleotide pairings according to Chargaff's rules are A and T, C and G.