Table of contents

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 overall structure of DNA as depicted in the diagram?

A single-stranded molecule with ribose sugar and uracil bases

A linear chain of amino acids joined by peptide bonds

A triple helix with parallel strands and identical base sequences

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

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Verified step by step guidance

Identify the key features of DNA structure from the options given, focusing on sugar type, strand number, and base pairing.

Recall that DNA is composed of two strands forming a double helix, where each strand runs in opposite directions (antiparallel).

Understand that the strands are held together by complementary base pairing: adenine pairs with thymine, and cytosine pairs with guanine.

Note that DNA contains deoxyribose sugar and does not contain uracil; uracil is found in RNA instead.

Eliminate options that describe RNA (single-stranded with uracil), proteins (amino acid chains), or incorrect helix structures (triple helix), confirming that the correct description is a double helix with two antiparallel strands held together by complementary base pairing.