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Biochemistry

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Purines, Pyrimidines and Nucleic Acid Metabolism

Question
23 out of 59
 

Same amino acid coded by multiple codons due to (AIIMS Nov 2010)



A Transcription

B Degeneracy

C Frame shift mutation

D Mutation

Ans. B Degeneracy

Characteristics of the genetic code

Usage of the genetic code is remarkably consistent throughout all living organisms. It is assumed that once the standard genetic code evolved in primitive organisms, any mutation that altered the manner in which the code was translated would have caused the alteration of most, if not all, protein sequences, which would certainly have been lethal. Characteristics of the genetic code include the following:

a. Specificity: The genetic code is specific (unambiguous), that is, a particular codon always codes for the same amino acid.

b. Universality: The genetic code is virtually universal, that is, the specificity of the genetic code has been conserved from very early stages of evolution, with only slight differences in the manner in which the code is translated.

c. Degeneracy: The genetic code is degenerate (sometimes called redundant). Although each codon corresponds to a single amino acid, a given amino acid may have more than one triplet coding for it. For example, arginine is specified by six different codons.

Purines, Pyrimidines and Nucleic Acid Metabolism Flashcard List

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