Textbook Question
Which of the following equations are true for the percentages of nucleotides in double-stranded DNA?
(A+T)/(G+C)=1.0
1
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Ch. 7 - DNA Structure and Replication
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172
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Table of contents
- Ch. 1 - The Molecular Basis of Heredity, Variation, and Evolution64
- Ch. 2 - Transmission Genetics144
- Ch. 3 - Cell Division and Chromosome Heredity81
- Ch. 4 - Gene Interaction87
- Ch. 5 - Genetic Linkage and Mapping in Eukaryotes103
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages73
- Ch. 7 - DNA Structure and Replication71
- Ch. 8 - Molecular Biology of Transcription and RNA Processing79
- Ch. 9 - The Molecular Biology of Translation110
- Ch. 10 - Eukaryotic Chromosome Abnormalities and Molecular Organization100
- Ch. 11 - Gene Mutation, DNA Repair, and Homologous Recombination86
- Ch. 12 - Regulation of Gene Expression in Bacteria and Bacteriophage90
- Ch. 13 - Regulation of Gene Expression in Eukaryotes38
- Ch. 14 - Analysis of Gene Function via Forward Genetics and Reverse Genetics72
- Ch. 15 - Recombinant DNA Technology and Its Applications69
- Ch. 16 - Genomics: Genetics from a Whole-Genome Perspective49
- Ch. 17 - Organelle Inheritance and the Evolution of Organelle Genomes27
- Ch. 18 - Developmental Genetics43
- Ch. 19 - Genetic Analysis of Quantitative Traits66
- Ch. 20 - Population Genetics and Evolution at the Population, Species, and Molecular Levels105
Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172Not the one you use?Change textbook
Chapter 7, Problem 16c
Which of the following equations are true for the percentages of nucleotides in double-stranded DNA?
(A)/(T)=(G)/(C)
Verified step by step guidance1
Understand the structure of double-stranded DNA: DNA is composed of four nucleotide bases - adenine (A), thymine (T), guanine (G), and cytosine (C). In double-stranded DNA, base pairing occurs such that A pairs with T and G pairs with C.
Recall Chargaff's rules: Chargaff's rules state that in double-stranded DNA, the amount of adenine (A) is equal to the amount of thymine (T), and the amount of guanine (G) is equal to the amount of cytosine (C). This can be expressed as A = T and G = C.
Analyze the given equation: The equation provided is (A)/(T) = (G)/(C). Using Chargaff's rules, substitute A = T and G = C into the equation. This simplifies the equation to 1 = 1, which is true.
Interpret the equation: The equation (A)/(T) = (G)/(C) essentially reflects the proportionality of nucleotide pairing in double-stranded DNA. Since A pairs with T and G pairs with C, the ratios of A to T and G to C are both equal to 1.
Conclude the validity of the equation: Based on Chargaff's rules and the structure of double-stranded DNA, the equation (A)/(T) = (G)/(C) is true for the percentages of nucleotides in double-stranded DNA.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Chargaff's Rules
Chargaff's Rules state that in double-stranded DNA, the amount of adenine (A) is equal to thymine (T), and the amount of guanine (G) is equal to cytosine (C). This means that A pairs with T and G pairs with C, leading to the conclusion that the ratios of these nucleotides are consistent across different organisms.
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Base Pairing
Base pairing refers to the specific hydrogen bonding between nucleotide bases in DNA. Adenine pairs with thymine through two hydrogen bonds, while guanine pairs with cytosine through three hydrogen bonds. This complementary pairing is crucial for the stability of the DNA double helix and ensures accurate DNA replication.
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Double-Stranded DNA Structure
Double-stranded DNA consists of two strands that run in opposite directions, forming a double helix. Each strand is composed of a sugar-phosphate backbone and nitrogenous bases. The antiparallel nature of the strands and the specific base pairing are essential for the integrity and function of genetic material, influencing processes like transcription and replication.
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Related Practice
Textbook Question
Which of the following equations are true for the percentages of nucleotides in double-stranded DNA?
(A+G)/(C+T)=1.0
Textbook Question
Which of the following equations are true for the percentages of nucleotides in double-stranded DNA?
(A)/(C)=(G)/(T)
Textbook Question
Which of the following equations are true for the percentages of nucleotides in double-stranded DNA?
(A)/(G)=(T)(C)
2
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Textbook Question
Diagram a replication fork in bacterial DNA and label the following structures or molecules.
a. DNA pol III
b. Helicase
c. RNA primer
d. Origin of replication
e. leading strand (label its polarity)
f. DNA pol I
g. Topoisomerase
h. SSB protein
i. Lagging strand (label its polarity)
j. Primase
k. Okazaki fragment
Textbook Question
Which of the following equalities is not true for double-stranded DNA?
(G+T)=(A+C)