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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
Write the contributions of the following scientists in deciphering the genetic code.
George Gamow; Hargobind Khorana; Marshall Nirenberg; Severo Ochoa
Differentiate between the genetic codes given below:
Degenerate and Initiator
Name the anticodon required to recognize the following codon: CGA
Name the anticodon required to recognize the following codon: GCA.
DNA is a polymer of nucleotides which are linked to each other by 3’-5’ phosphodiester bond. To prevent polymerisation of nucleotides, which of the following modifications would you choose?
Genetic code is ______.
Frame shift mutation occurs when ______.
Because most of the amino acids are represented by more than one codon, the genetic code is ______.
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 ______.
Which out of the following statements is incorrect?
Some amino acids are coded by more than one codon, hence the genetic code is ______.
Which of the following organ is essential for photorespiration?
Methionine carrying tRNA has anticodon:
George Gamow suggested that each codon coding for an amino acid consists of ______
Genetic code is universal, it means ______
Which amino acid is determined by four genetic codes?
How many codons code for amino acid?
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.
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.
Discuss the process of translation in detail.
Who proposed that the genetic code for amino acids should be made up of three nucleotides?
All the 64 codons in the dictionary of genetic code were deciphered by ______.
