Question

The following segment of DNA encodes for a short polypeptide. Note that DNA triplets encoding for the start codon (AUG) and a stop codon are included in this sequence. What is the polypeptide sequence encoded by this gene?
5’…CCCAGCCTAGCCTTTGCAAGAGGCCATATCGAC…3’
3’…GGGTCGGATCGGAAACGTTCTCCGGTATAGCTG…5’
a) Met-Gly-Arg-Gly-Phe-Ala
b) Met-Ala-Ser-Cys-Lys-Gly
c) Met-Ala-Ser-Cys-Lys-Gly-Ile
d) Met-Gly-Arg-Gly-Phe-Ala-Ile

Answer 1

Answer:

So none of the option is correct.

Explanation:

As we know the transcription occurs in 5' to 3' direction so 3'-5' work as a template strand for the transcription and the mRNA formed will be :-

5' CCC AGC CUA GCC UUU GCA AGA GGC CAU AUC GAC 3'

Here there is no start codon( AUG) for translation.

So none of the option is correct.

There might be error in the nucleotide sequence.

CCC- pro

AGC - ser

CUA- leu

GCC- ala

UUU- phe

GCA- ala

AGA- arg

GGC- gly

CAU- his

AUC- lle

GAC- asp