Question

The coding region of gene P is 1500 bases long, and it contains two introns that are each 150 bases in length. How long is this gene's translated polypeptide?

99 amino acids long

299 amino acids long

399 amino acids long

599 amino acids long

1199 amino acids long

Answer 1

I believe the correct answer to be:

Option C) 399 amino acids.

As the introns are 2 x 150 = 300bp long that is removed from the 1500 base which will leave 1500-300= 1200 base pairs and since each codon/amino acid is coded by 3 nucleotide, the number of aminoacids should be:

1200/3 = 400 amino acids.

And since there is a stop codon at the end that does not code for any amino acid, 1 amino acid will be removed so,

400-1 = 399 amino acids.

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