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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 components make up the backbone (sides) of the DNA molecule?

Deoxyribose sugars and nitrogenous bases

Ribose sugars and phosphate groups

Alternating deoxyribose sugars and phosphate groups

Nitrogenous bases and phosphate groups

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Verified step by step guidance

Recall the structure of the DNA molecule, which is often described as a double helix with two strands running in opposite directions.

Understand that the backbone (or sides) of the DNA molecule is formed by repeating units that provide structural support.

Identify the components involved in the backbone: the sugar and phosphate groups alternate along each strand.

Note that in DNA, the sugar is deoxyribose, not ribose (which is found in RNA).

Recognize that the nitrogenous bases (adenine, thymine, cytosine, guanine) are attached to the sugar and form the 'rungs' of the ladder, not the backbone.