Data: Transcription and processing of mRNA Shown below is a hypothetical DNA seq

Question

Data: Transcription and processing of mRNA Shown below is a hypothetical DNA sequence from a virus. Also shown is the sequence of the RNA that is synthesized from this DNA. DNA sequence: 5'-AGCGAAATAAGCCGATTATGCCTTAACGTGAATAAA-3' 3'-TCGCTTTATTCGGCTAATACGGAATTGCACTTATTT -5' RNA sequence (G* = G cap): 5'-G*AGCGAACCGAUUAAUGAAUAAAAAAA....-3' Identifying exons in a DNA segment based on the mRNA How many exons does this DNA segment contain? (Enter your answer as a numeral not word, e.g., enter 5 not five.) ____

Explanation / Answer

This DNA contains 4 exons.

Explanation:

The DNA sequence: 3' T CGCTTTATTCG GCT AA TAC GGAATTGCAC TTA TTT 5'exon

The RNA sequence :5'-G A GCG AAC CGA UUA AUG AAU AAAAAAA 3'

We have to look at RNA sequence after poly A and direction should be from 3'to 5' end.After polyA ,the first three sequence of bases are UAA.Now find the complementary sequence in DNA strand above.When there is no sequence complementary, it marks the beginning of intron.

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