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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

Which of the following combinations of base pairs will be found in a molecule of DNA?

Adenine–Thymine and Guanine–Cytosine

Adenine–Uracil and Guanine–Cytosine

Thymine–Uracil and Adenine–Guanine

Adenine–Cytosine and Guanine–Thymine

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Verified step by step guidance

Recall the basic structure of DNA, which is composed of two strands forming a double helix, where nitrogenous bases pair specifically according to Chargaff's rules.

Identify the four nitrogenous bases in DNA: Adenine (A), Thymine (T), Guanine (G), and Cytosine (C). Note that Uracil (U) is found in RNA, not DNA.

Understand the base pairing rules in DNA: Adenine pairs with Thymine, and Guanine pairs with Cytosine. This can be represented as $A \leftrightarrow T$ and $G \leftrightarrow C$.

Evaluate each given combination to see if it follows these pairing rules and contains only DNA bases (no Uracil).

Conclude that the correct base pair combinations in DNA are Adenine–Thymine and Guanine–Cytosine, as these satisfy both the base pairing rules and the composition of DNA.