Deletion of a single nucleotide in a methionine codon can cause a frameshift tha

Question

Deletion of a single nucleotide in a methionine codon can cause a frameshift that generates a stop codon if the methionine codon is followed by a codon for which of the following amino acids: A. proline (Pro) B. glycine (Gly) C. alanine (Ala) D. tryptophan (Trp) E. isoleucine (lle) Earth may not be unique in possessing an environment where life can evolve. Imagine that space exploration reveals the existence of other life forms that have evolved in a manner similar to life on earth but these life forms make proteins that are much more chemically complex than ours in that they can have one of 231 different amino acids at each position in the protein (instead of 20 as we have here on earth). Assuming that nucleotides encode amino acids in the same way as life on earth, what is the minimum number of nucleotides that would be required to specify each amino acid. (i.e. how many nucleotides are required per codon). Briefly explain the reasoning that is the basis for your answer.

Explanation / Answer

Delition in single nucleotide in methionine codon cause a frameshift that generate stop codon. if methionine codon is followed by a codon it code for amino acid Isoleucine. Methionine is coded by AUG, AUN codon code isoleucine. 3 out of 4 tRNA genes are lost in genome of bacteria and plastid; it suggest that less than 4 tRNA capable to decode the triplet in AUN box.

codon consist of three nucleotides. the total no of nucleotides is 4 so the possible no of codons from 4 nucleotides is 4*4*4=64. three of these 64 are nonsence codon that dont code for any aminoacid.

AUG that code for methionine is called initiation codon.

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