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Ch.17 Nucleic Acids and Protein Synthesis
Timberlake - Chemistry: An Introduction to General, Organic, and Biological Chemistry 13th Edition
Timberlake13th EditionChemistry: An Introduction to General, Organic, and Biological ChemistryISBN: 9780134421353Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTimberlake 13th EditionCh.17 Nucleic Acids and Protein SynthesisProblema 23
Capitolo 17, Problema 23

List three structural characteristics of DNA.

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DNA (Deoxyribonucleic Acid) is a double-stranded molecule, meaning it consists of two complementary strands that are coiled around each other to form a double helix structure.
The backbone of each DNA strand is composed of alternating sugar (deoxyribose) and phosphate groups, which are connected by phosphodiester bonds.
The interior of the DNA double helix contains nitrogenous bases (adenine, thymine, cytosine, and guanine) that pair specifically through hydrogen bonding: adenine pairs with thymine (A-T) and cytosine pairs with guanine (C-G).

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Double Helix Structure

DNA is structured as a double helix, which consists of two long strands of nucleotides twisted around each other. This configuration provides stability and allows for the efficient storage of genetic information. The strands are held together by hydrogen bonds between complementary base pairs, which are adenine-thymine and guanine-cytosine.
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DNA Double Helix Concept 1

Antiparallel Strands

The two strands of DNA run in opposite directions, a feature known as antiparallel orientation. One strand runs from the 5' to 3' direction, while the other runs from 3' to 5'. This orientation is crucial for DNA replication and transcription, as enzymes that synthesize new strands can only add nucleotides to the 3' end.
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DNA Double Helix Example 1

Base Pairing

Base pairing refers to the specific hydrogen bonding between the nitrogenous bases of the two DNA strands. Adenine pairs with thymine (A-T) and guanine pairs with cytosine (G-C). This complementary base pairing is essential for the accurate replication of DNA and the transmission of genetic information during cell division.
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Base Pairing Concept 1
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Domanda del libro di testo

What components join together to form the backbone of a nucleic acid?

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Draw the condensed structural formula for the dinucleotide G C that would be in RNA.

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How are the two strands of nucleic acid in DNA held together?

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Write the base sequence in a complementary DNA segment if each original segment has the following base sequence:

d. C T G T A T A C G T T A

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Domanda del libro di testo

What component in a nucleic acid determines the 5' free end?

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Domanda del libro di testo

Write the base sequence in a complementary DNA segment if each original segment has the following base sequence:

d. A T A T G C G C T A A A

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