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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
The first codon to be deciphered was ______ which codes for ______.
One of the following is true with respect to AUG.
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?
Because most of the amino acids are represented by more than one codon, the genetic code is ______.
Out of A=T, G =C pairing, bases of DNA may exist in alternate valency state owing to arrangement called ______.
H. J. Muller was awarded Nobel Prize for his ______.
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?
Phenylalanine is a ______.
Percentage of mitochondrial DNA in the cell is:
Genetic code translates the language of:
George Gamow suggested that each codon coding for an amino acid consists of ______
Which amino acid is determined by four genetic codes?
How many codons code for amino acid?
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.
Discuss the process of translation in detail.
Which one of the following is a termination codon?
All the 64 codons in the dictionary of genetic code were deciphered by ______.
According to George Gamow's proposal from 1954, why is the genetic code a triplet code?
How many codons in total exist in the genetic code?
What is the start codon and which amino acid does it code for?
Which enzyme did Severo Ochoa identify as capable of polymerizing RNA with defined sequences in a template-independent manner?
Which of the following sets of codons all code for the same amino acid, demonstrating degeneracy?
How many codons code for amino acids and how many are stop codons?
