Heterocycles in DNA and RNA

Heterocycles in DNA and RNA - Heterocycles in DNA and RNA...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Heterocycles in DNA and RNA +Heterocycles are cyclic molecules with non-carbon atoms in the ring (i.e. O, N, S). Nitrogen heterocycles are important in biology. For example, the DNA and RNA bases are all aromatic nitrogen heterocycles. +DNA and RNA are the chemical carriers of genetic information. + DNA and RNA Bases: -The bases present in both nucleic acids (DNA and RNA) are adenine , guanine and cytosine . Thymine is exclusively present in DNA and uracil exclusively present in RNA. +Tautomers -The five nucleobases: adenine, guanine, cytosine, thymine and uracil can exits in more than one tautomeric form. -Tautomers are constitutional isomers in rapid equilibrium with one another. Usually they differ in the position of a hydrogen atom. - A typical example of a tautomeric reaction is the keto-enol equilibrium. Since a carbonyl group is more stable than a carbon-carbon double bond, the equilibrium normally favors the keto form. -
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/13/2010 for the course ABC BTUN80809 taught by Professor Mr.chuck during the Spring '09 term at McGill.

Page1 / 2

Heterocycles in DNA and RNA - Heterocycles in DNA and RNA...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online