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Why are some untranslated sequence of ba...

Why are some untranslated sequence of bases seen in mRNA, coding for polypeptide? Where exactly are they present on mRNA?

Text Solution

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The untranslated regions are protective against changes in coding sequences. They are also required in the translation process. The untranslated sequences are present in the cap region (5 end) and tail region (3 end)
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(a) Study the table given below and identify (i), (ii), (iii) and (iv) {:("Amino acid","Phe","Val"),("DNA Code in Gene","AAA","CAC"),("Codon in mRNA",(i),(ii)),("Anticodon in tRNA",(iii),(iv)):} (b) A polypeptide consists of 14 different amino acids. (i) How many base pairs must be there in the processed mRNA that codes for this polypeptide? (ii) How many different types of tRNA are needed for the synthesis of this polypeptide ?

The synthesis of a polypeptide chain or a protein from mRNA is called

Knowledge Check

  • If the sequence of bases in coding strand of DNA is ATTCGATC, then the sequence of bases in mRNA will be

    A
    TA A C T AC
    B
    U A A G C U A C
    C
    A T T C G A TG
    D
    AUUCGAUG

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