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Molecular Basis of Inheritance — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYMolecular Basis of Inheritance3 Marks
Question
  1. Differentiate between unambiguous and degenerate codons.
  2. Write two functions of the codon AUG.
✓

Answer

  1. Differences between unambiguous and degenerate codons are-
S. No.
Unambiguous codon
Degenerate codon
1.
No ambiguity for a particular codon.
Code is degenerate for a particular amino acid.
2.
A particular codon will always code for the same amino acid, where it is found.
One amino acid often has more than one code triplet.
3.
eg. GGA is an unambiguous codon, it codes only for glycine and no other amino acid.
e.g. Phenylalanine has two codons, i.e. UUU and UUC.
  1. Functions of codon AUG is as follows-
  1. Codes for methionine.
  2. Serves as a signal to initiate protein synthesis (initiator codon).

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