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प्रश्न
There is only one possible sequence of amino acids when deduced from a given nucleotides. But multiple nucleotides sequence can be deduced from a single amino acid sequence. Explain this phenomena.
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उत्तर
Some amino acids are coded by more than one codon (known as degeneracy of codons), hence on deducing a nucleotide sequence from an amino acid sequence, multiple nucleotide sequence will be obtained. For e.g., Ile has three codous: AUU, AUC AUA hence a depeptide Met–Ile can have the following nucleotide sequence:
- AUG – AUU
- AUG – AUC
- AUG – AUA
and if, we deduce amino acid sequence for the above nucleotide sequences, all the three will code for Met–Ile
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संबंधित प्रश्न
Give an example of a codon having a dual function.
Differentiate between the genetic codes given below:
Unambiguous and Universal
Name the anticodon required to recognize the following codon: CGA
Name the anticodon required to recognize the following codon: UAU
Name the anticodon required to recognize the following codon: GCA.
Frame shift mutation occurs when ______.
Khorana first deciphered the triplet codons of ______.
The number of base substitution possible in amino acid codons is ______.
Sickle cell anemia results from a single base substitution in a gene, thus it is an example of ______.
Select the incorrectly matched pair.
Phenylalanine is a ______.
Genetic code was discovered by:
What would happen if in a gene encoding a polypeptide of so amino acid 25th (UAC) is match to UAA?
Genetic code is universal, it means ______
Statement I:
The codon ‘AUG’ codes for methionine and phenylalanine.
Statement II:
‘AAA’ and ‘AAG’ are both codons that code for the amino acid lysine.
In light of the above statements, choose the correct answer from the options given below.
Based on your understanding of genetic code, explain the formation of any abnormal hemoglobin molecule. What are the known consequences of such a change?
A single base mutation in a gene may not ‘always’ result in loss or gain of function. Do you think the statement is correct? Defend your answer.
Who proposed that the genetic code for amino acids should be made up of three nucleotides?
