Table of contents

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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

What is the twisted ladder shape of DNA called?

Nucleotides

3-D model

Double helix

Single strand

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Verified step by step guidance

Understand the structure of DNA: DNA is composed of two long strands forming a shape that resembles a twisted ladder.

Recall the terminology used to describe DNA's shape: The term 'double helix' refers to two strands twisted around each other.

Differentiate between the options: 'Nucleotides' are the building blocks of DNA, not the shape; '3-D model' is a general term; 'Single strand' refers to only one strand, not the twisted ladder shape.

Recognize that the 'double helix' accurately describes the twisted ladder shape formed by two strands of DNA.

Conclude that the correct term for the twisted ladder shape of DNA is the 'double helix'.