Textbook Question
What is the hyperchromic effect? How is it measured? What does Tₘ imply?
Ch. 9 - DNA Structure and Analysis
Klug10th EditionEssentials of GeneticsISBN: 9780135588789
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Table of contents
- Ch. 1 - Introduction to Genetics16
- Ch. 2 - Mitosis and Meiosis28
- Ch. 3 - Mendelian Genetics37
- Ch. 4 - Modification of Mendelian Ratios53
- Ch. 5 - Sex Determination and Sex Chromosomes32
- Ch. 6 - Chromosome Mutations: Variation in Number and Arrangement37
- Ch. 7 - Linkage and Chromosome Mapping in Eukaryotes36
- Ch. 8 - Genetic Analysis and Mapping in Bacteria and Bacteriophages24
- Ch. 9 - DNA Structure and Analysis38
- Ch. 10 - DNA Replication29
- Ch. 11 - Chromosome Structure and DNA Sequence Organization22
- Ch. 12 - The Genetic Code and Transcription36
- Ch. 13 - Translation and Proteins27
- Ch. 14 - Gene Mutation, DNA Repair, and Transposition34
- Ch. 15 - Regulation of Gene Expression in Bacteria22
- Ch. 16 - Regulation of Gene Expression in Eukaryotes37
- Ch. 17 - Recombinant DNA Technology27
- Ch. 18 - Genomics, Bioinformatics, and Proteomics30
- Ch. 19 - The Genetics of Cancer21
- Ch. 20 - Quantitative Genetics and Multifactorial Traits37
- Ch. 21 - Population and Evolutionary Genetics45
Chapter 9, Problem 21
What is the physical state of DNA after it is heated and denatured?
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Understand that DNA is composed of two complementary strands held together by hydrogen bonds between base pairs.
Recognize that heating DNA provides energy to break these hydrogen bonds, causing the two strands to separate, a process known as denaturation.
Note that after denaturation, the DNA exists as single-stranded molecules rather than the original double helix.
Realize that this single-stranded DNA is still physically present in solution but no longer maintains the double helical structure.
Conclude that the physical state of DNA after heating and denaturation is single-stranded DNA, which is more flexible and lacks the stable double helix conformation.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
DNA Denaturation
DNA denaturation refers to the process where the double-stranded DNA molecule separates into two single strands due to the breaking of hydrogen bonds between complementary bases, typically caused by heat or chemical agents.
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Physical State of Single-Stranded DNA
After denaturation, DNA exists as single-stranded molecules that are more flexible and less ordered than the original double helix, losing the stable, compact structure and becoming more extended in solution.
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Reversibility of DNA Denaturation
DNA denaturation is often reversible; upon cooling, complementary single strands can re-anneal or renature, reforming the double helix, which is important for processes like PCR and molecular biology techniques.
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Related Practice
Textbook Question
Why is Tₘ related to base composition?
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How is the absorption of ultraviolet light by DNA and RNA important in the analysis of nucleic acids?
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Textbook Question
What is the chemical basis of molecular hybridization?
Textbook Question
List three main differences between DNA and RNA.
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Textbook Question
What are the three major types of RNA molecules? How is each related to the concept of information flow?