Q. How many amino acids will be coded by following given hnRNA, if all the codons containing single or more than one cytosine represent the intron?
AUG CCC CAC CAC UUA UAU AUA GGC GAU AAA GCG UUU CAU UAA

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Solution:

Codon are triplet.In the above mRNA, if all the codons containing single or more than one cytosine represent the intron then the mRNA codes 7 amino acid (AUG UUA UAU AUA GAU AAA UUU ), UAA is one of the stop codon hence it cannot code for any amino acid.