Textbook Question
Which of the following equations are true for the percentages of nucleotides in double-stranded DNA?
(A)/(T)=(G)/(C)
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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 16b
Which of the following equations are true for the percentages of nucleotides in double-stranded DNA?
(A+T)/(G+C)=1.0
Verified step by step guidance1
Understand Chargaff's rules: 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 is because A pairs with T and G pairs with C.
Express Chargaff's rules mathematically: A = T and G = C. Therefore, the total percentage of purines (A + G) equals the total percentage of pyrimidines (T + C).
Analyze the given equation: The equation (A + T)/(G + C) = 1.0 suggests that the sum of adenine and thymine is equal to the sum of guanine and cytosine in double-stranded DNA.
Consider the implications of Chargaff's rules: While A = T and G = C individually, the ratio (A + T)/(G + C) depends on the specific composition of the DNA and is not necessarily equal to 1.0. The ratio varies depending on the organism's genome.
Conclude the evaluation: Based on Chargaff's rules and the variability of nucleotide composition across different organisms, the equation (A + T)/(G + C) = 1.0 is not universally true for all 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 the percentages of A and T, as well as G and C, are complementary, leading to the conclusion that (A + T) should equal (G + C) in a given DNA sample.
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Base Pairing
Base pairing refers to the specific hydrogen bonding between nucleotides in DNA, where adenine pairs with thymine (A-T) and guanine pairs with cytosine (G-C). This pairing is crucial for the stability of the DNA double helix and ensures accurate replication and transcription of genetic information.
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Nucleotide Composition
The nucleotide composition of DNA refers to the relative amounts of the four nucleotides (A, T, G, C) present in a DNA molecule. Understanding the composition is essential for analyzing genetic sequences and can provide insights into evolutionary relationships and species identification.
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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
views
Textbook Question
Bacterial DNA polymerase I and DNA polymerase III perform different functions during DNA replication.
If a strain of E. coli acquired a mutation that inactivated DNA polymerase III function, would the cell be able to replicate its DNA? Why or why not?
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