answer with reason...
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Answers
Answer:
4th option is correct.
Explanation:
A codon is triplet in nature, codon is composed of 3 adjacent nitrogen bases which specifies 1 amino acid in polypeptide chain.
In 4th option 6 bases in starting are coding 2 amino acid and when 7,8 and 9th bases are being deleted there would be no effect in those 2 amino acid and 3 amino acid will be coded by GCU.
Answer:
[4]
Explanation:
SINCE AN AMINO AID IS CODDED BY A CODON WHICH CONSIST OF 3 NITROGEN BASES , FIRST LET'S GROUP THESE AS CODON:
5' AAC AGC GGU GCU AAU 3'
[1] ADDING G AT 5 TH POSITION.
THE M-RNA BECOMES:
5' AAC AAG CGG UGC UAA U 3'
THE READING FRAME CHANGES.
[2] DELETION OF G FROM 5 TH POSITION.
THE M-RNA BECOMES:
5' AAC ACG GUG CUA AU 3'
THE READING FRAME CHANGES.
[3] INSERTION OF A AT 4 AND 5 TH POSITION..
THE M-RNA BECOMES:
5 'AAC AAA GCG GUG CUA AU 3'
THE READING FRAME CHANGES.
[4] DELETION OF GGU FROM 7 , 8 , 9 . TH POSITION.
THE M-RNA BECOMES:
5'AAC AGC GCU AUU 3'
HERE READING FRAME DOESNOT CHANGE .
HOPE THIS HELPS.