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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 93a
Capitolo 17, Problema 93a

Identify each of the following bases as a pyrimidine or a purine:
a. cytosine

Guida verificata passo dopo passo
1
Understand the difference between pyrimidines and purines: Pyrimidines are single-ring nitrogenous bases, while purines are double-ring nitrogenous bases.
Recall the common pyrimidines: cytosine, thymine, and uracil. These are characterized by their single-ring structure.
Recall the common purines: adenine and guanine. These are characterized by their double-ring structure.
Examine the given base, cytosine, and identify its structure. Cytosine is a single-ring nitrogenous base.
Based on the structure of cytosine, classify it as a pyrimidine because it has a single-ring structure.

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Pyrimidines and Purines

Pyrimidines and purines are the two categories of nitrogenous bases found in nucleic acids. Pyrimidines, which include cytosine, thymine, and uracil, have a single six-membered ring structure. In contrast, purines, such as adenine and guanine, consist of a fused double-ring structure. Understanding the structural differences between these bases is essential for classifying them correctly.
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Nitrogenous Bases Example 1

Cytosine

Cytosine is one of the four primary nitrogenous bases in DNA and RNA. It is classified as a pyrimidine due to its single-ring structure. Cytosine pairs with guanine in DNA and RNA, playing a crucial role in the genetic code and the stability of nucleic acid structures. Recognizing cytosine's classification helps in understanding its function in genetic information.
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3:04
Naming Nucleosides and Nucleotides Concept 3

Base Pairing

Base pairing refers to the specific hydrogen bonding between nitrogenous bases in DNA and RNA, which is fundamental for the structure of nucleic acids. In DNA, adenine pairs with thymine, and cytosine pairs with guanine. This complementary pairing is vital for DNA replication and transcription processes. Understanding base pairing is crucial for grasping how genetic information is stored and transmitted.
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2:56
Base Pairing Concept 1
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Domanda del libro di testo

Suppose a mutation occurs in the DNA section in problem 17.89, and the first base in the parent chain, adenine, is replaced by guanine.

b. Using the new strand that results from this mutation, write the order of bases in the altered mRNA.

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Domanda del libro di testo

Identify the base and sugar in each of the following nucleotides:

b. dAMP

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Domanda del libro di testo

Identify the base and sugar in each of the following nucleosides:

a. deoxythymidine

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Domanda del libro di testo

Suppose a mutation occurs in the DNA section in problem 17.89, and the first base in the parent chain, adenine, is replaced by guanine.

d. What effect, if any, might this mutation have on the structure and/or function of the resulting protein?

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Domanda del libro di testo

Suppose a mutation occurs in the DNA section in problem 17.89, and the first base in the parent chain, adenine, is replaced by guanine.

c. Write the three-letter symbols for the amino acids that would go into the peptide from the mRNA you wrote in part b.

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Domanda del libro di testo

Identify the base and sugar in each of the following nucleosides:

c. cytidine

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