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

If complementary DNA strands were arranged in a parallel manner instead of the usual antiparallel orientation, which of the following would most likely occur?

The genetic code would be altered, resulting in different amino acids being produced.

DNA replication would proceed more efficiently.

Hydrogen bonding between base pairs would be disrupted, destabilizing the double helix.

The DNA double helix would become more stable due to enhanced base stacking.

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Verified step by step guidance

Step 1: Understand the normal structure of DNA, which consists of two complementary strands running in opposite directions, known as antiparallel orientation (one strand runs 5' to 3', the other 3' to 5').

Step 2: Recognize that hydrogen bonds form between complementary bases (A-T and G-C) in this antiparallel arrangement, stabilizing the double helix.

Step 3: Consider what happens if the strands were arranged in a parallel manner (both strands running 5' to 3' or 3' to 5'), which would affect the alignment of bases and the ability to form proper hydrogen bonds.

Step 4: Analyze how disrupted hydrogen bonding would impact the stability of the DNA double helix, likely causing destabilization rather than increased stability or changes in the genetic code.

Step 5: Conclude that the most likely outcome of parallel strand orientation is disruption of hydrogen bonding between base pairs, leading to destabilization of the DNA double helix.