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Which of the following is an unsual nucleoside that is found in tRNA but not mRNA?

a. Adenine
b. Inosine
c. Proline
d. Phenylalanine
e. Guanine

1 Answer

1 vote

Answer:

Inosine

Step-by-step explanation:

  • Inosine the unusual nucleoside which is found in tRNA but not in mRNA.
  • Inosine is derived from the nucleoside adenosine, adenosine is present in mRNA, however in case of tRNA, there is deamination of adenosine and thus, inosine is formed.
  • The enzyme that is responsible for carrying out this reaction is called as tRNA A:34 deaminases, here the position 34 indicates that the deamination takes place at position 34 of the tRNA.
  • The formation of inosine is essential for the wobble base pairing to take place.
  • The formation of inosine takes place when the hypoxanthine attaches to a ribose ring with the help of the beta glycosidic bond.