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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 best describes the basic structure of a DNA molecule?

A double helix composed of two antiparallel strands held together by complementary base pairing

A linear chain of amino acids linked by peptide bonds

A single-stranded molecule with uracil as one of its bases

A triple helix formed by three polynucleotide chains

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Verified step by step guidance

Recall that DNA stands for deoxyribonucleic acid, which is the molecule that carries genetic information in most living organisms.

Understand that the basic structure of DNA was discovered by Watson and Crick, who described it as a double helix.

Recognize that DNA consists of two strands running in opposite directions, which is referred to as antiparallel orientation.

Know that the two strands are held together by complementary base pairing, where adenine pairs with thymine and cytosine pairs with guanine.

Compare the given options to these characteristics to identify that the correct description is a double helix composed of two antiparallel strands held together by complementary base pairing.