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Ch.17 Nucleic Acids and Protein Synthesis
Timberlake - Chemistry: An Introduction to General, Organic, and Biological Chemistry 14th Edition
Timberlake14th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9781292472249Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTimberlake 14th EditionCh.17 Nucleic Acids and Protein SynthesisProblema 103
Capitolo 17, Problema 103

 If the DNA double helix in salmon contains 28% adenine, what is the percentage of thymine, guanine, and cytosine?

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Understand the base pairing rules in DNA: Adenine (A) pairs with Thymine (T), and Guanine (G) pairs with Cytosine (C). This means the percentage of adenine is equal to the percentage of thymine, and the percentage of guanine is equal to the percentage of cytosine.
Since adenine makes up 28% of the DNA, thymine must also make up 28% due to the base pairing rule.
The total percentage of adenine and thymine combined is 28% + 28% = 56%.
The remaining percentage of the DNA is composed of guanine and cytosine. Subtract the combined percentage of adenine and thymine from 100%: 100% - 56% = 44%.
Divide the remaining percentage equally between guanine and cytosine, as they pair together and are present in equal amounts: 44% ÷ 2 = 22% for guanine and 22% for cytosine.

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Base Pairing Rules

In DNA, the base pairing rules dictate that adenine (A) pairs with thymine (T), and guanine (G) pairs with cytosine (C). This means that the amount of adenine in a DNA molecule is always equal to the amount of thymine, while the amount of guanine equals the amount of cytosine. Understanding these rules is essential for calculating the percentages of the other bases when one is known.
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Base Pairing Concept 2

Percentage Composition of DNA Bases

The percentage composition of DNA bases refers to the relative amounts of adenine, thymine, guanine, and cytosine in a DNA molecule. In a double-stranded DNA molecule, the total percentage of A and T combined will equal the total percentage of G and C combined. This concept is crucial for solving problems related to the composition of DNA when given partial information.
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DNA Double Helix Concept 1

Complementary Base Pairing

Complementary base pairing is the principle that explains how the bases in DNA strands align with each other. Since adenine pairs with thymine and guanine pairs with cytosine, knowing the percentage of one base allows for the deduction of its complementary base's percentage. This concept is fundamental in determining the overall base composition of DNA when only a subset of data is provided.
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Base Pairing Concept 1
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