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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

(a) What type of interaction holds DNA's double-helical strands together?

(b) Why would it not be good for DNA's double-helical strands to be held together by covalent bonds?

a)

Interpretation Introduction

Interpretation:

The type of interaction hold by double helical strand together has to be found.

Concept introduction: Hydrogen bond- Hydrogen bond is the non-covalent bond which consists of hydrogen atom. Hydrogen bond forms the reversible bond between different hydrophilic groups. When two sides chains are react they release water molecule. This is a weak bond.

images

 Stacking interaction: Stacking interaction is the non-covalent interaction. These interactions are electrostatic and hydrophobic in nature. Stacking interaction depends on their dipole moments and aromaticity of bases. Two types of interaction found in nucleic acid double strand:

 Inter-strand stacking interaction.

  1. a) Intra-strand stacking interaction.

 For identify the stabilizing effects of base stacking, base pairs are consider more important instead of individual bases .This is the non-covalent and weak interaction consists of hydrogen atom and one donor and acceptor atoms.

Explanation

The main force that hold double helical strand togther is hydrogen bond . Hydrogen bond formed between the base pairs of two anti parellel strands.

So, between the two strands hydrogen bonding will form.

This is the hydrogen bonding between thymine and adenine as shown below:

b)

Interpretation Introduction

Interpretation:

The covalent bond interaction hold by double helical strand together is not good; the reason has to be found.

Concept introduction: Hydrogen bond- Hydrogen bond is the non-covalent bond which consists of hydrogen atom. Hydrogen bond forms the reversible bond between different hydrophilic groups. When two sides chains are react they release water molecule. This is a weak bond.

images

 Stacking interaction: Stacking interaction is the non-covalent interaction. These interactions are electrostatic and hydrophobic in nature. Stacking interaction depends on their dipole moments and aromaticity of bases. Two types of interaction found in nucleic acid double strand:

 Stacking interaction is the non-covalent interaction. These interactions are electrostatic and hydrophobic in nature. Stacking interaction depends on their dipole moments and aromaticity of bases. Two types of interaction found in nucleic acid double strand:

  1. a) Inter-strand stacking interaction.
  2. b) Intra-strand stacking interaction.

 For identify the stabilizing effects of base stacking, base pairs are consider more important instead of individual bases .This is the non-covalent and weak interaction consists of hydrogen atom and one donor and acceptor atoms.

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