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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

How does the fact that DNA molecules separate at 95 °C give evidence that the forces holding together DNA molecules are not covalent bonds?

Interpretation Introduction

Interpretation:

The forces holds together the double stranded DNA molecule are non-covalent bonds has to be determined.

Concept introduction: Targeted sequence of double stranded DNA is heated at tempreature 95 °C. Hydrogen bond holds the two strands of DNA. At this temperature, two strands together break and both the strands separate from each other.

Hydrogen bonds are non-covalent bond which are weaker than covalent bond. Non-covalent bonds are necessary to form double helical structure of  DNA.

Explanation

Covalent bonds are the stronger bond and once formed, they break rarely. Hydrogen bonds are the weaker bond which holds the two strands of DNA together. Covalent bonds are the stronger bond with energy of single bond is 80 kilocalories per mol. At very high temperature (95 °

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