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प्रश्न
Give reasons:
Genetic code is ‘universal’.
Explain when is a genetic code said to be universal.
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उत्तर
The genetic code is universal. It means that all known living systems use nucleic acids and the same three base codons (triplet codon) direct the synthesis of protein from amino acids. For example, the mRNA (UUU) codon codes for phenylalanine in all cells of all organisms. Some exceptions are reported in prokaryotic, mitochondrial and chloroplast genomes. However, similarities are more common than differences.
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संबंधित प्रश्न
Differentiate between the genetic codes given below:
Unambiguous and Universal
Name the anticodon required to recognize the following codon: AAU.
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.
Khorana first deciphered the triplet codons of ______.
The number of base substitution possible in amino acid codons is ______.
The change of the light coloured variety of peppered moth (Biston betularia) to its darker variety (Biston carbonarid) is due to ______.
Amino acids which are specified by single codons are ______.
Some amino acids are coded by more than one codon, hence the genetic code is ______.
Sickle cell anemia results from a single base substitution in a gene, thus it is an example of ______.
Select the incorrectly matched pair.
Percentage of mitochondrial DNA in the cell is:
Genetic code translates the language of:
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?
George Gamow suggested that each codon coding for an amino acid consists of ______
Frame shift mutations are caused by ______.
Which of the following statements is the most appropriate for sickle cell anaemia?
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.
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.
What is the start codon and which amino acid does it code for?
Which scientist proved the triplet nature of the genetic code through frame-shift mutation experiments in 1961?
Which of the following sets of codons all code for the same amino acid, demonstrating degeneracy?
Which three scientists are credited with ultimately deciphering all 64 codons of the genetic code dictionary?
