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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

DNA consists of two antiparallel strands of nucleotides held together by which type of bonds?

Ionic bonds

Disulfide bonds

Hydrogen bonds

Covalent bonds

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Verified step by step guidance

Understand the structure of DNA: DNA is composed of two strands running in opposite directions (antiparallel) made up of nucleotides.

Recall the types of bonds in DNA: The sugar-phosphate backbone of each strand is held together by covalent bonds, specifically phosphodiester bonds.

Focus on the interaction between the two strands: The nitrogenous bases on each strand pair with complementary bases on the opposite strand.

Identify the bond type between bases: These base pairs are held together by hydrogen bonds, which are weaker than covalent bonds and allow the strands to separate during replication.

Conclude that the two antiparallel strands of DNA are held together by hydrogen bonds between complementary bases.