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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 is a key structural feature of a DNA molecule?

Single-stranded linear structure

Triple helix with parallel strands

Double helix composed of two antiparallel strands

Circular structure with no base pairing

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Verified step by step guidance

Recall the basic structure of DNA as discovered by Watson and Crick, which is fundamental to understanding its function.

Identify that DNA consists of two strands that run in opposite directions, a feature known as antiparallel orientation.

Recognize that these two strands twist around each other forming a shape called a double helix.

Understand that the strands are held together by base pairing between complementary nucleotides (A pairs with T, and G pairs with C).

Conclude that the key structural feature of DNA is a double helix composed of two antiparallel strands, distinguishing it from single-stranded, triple helix, or circular structures.