Fa protein is coded for by a single gene and this protein has six clearly defined domains, which number of exons below is the gene likely to have? a) 1 b) 5 c) 8 d) 12 e) 14

The correct answer is C) 8 exons.

Explanation:

If we assume that each domain matches with an exon, and we have a 6 domain protein (domain= the functional regions of the protein that include the active site), there must be at least 6 exons in the gene. Also, remember that exons include the 5'- and 3'- untranslated regions or UTR. So, assuming that each unstraslated region is equivalent to an exon, there must be at least 8 exons in the gene (6 exon for each domain and one 2 exons for UTR).

Anyway, be careful, because this is a simple exercise where we assume a lot of things. In the real world, the first exon tends to include the 5'-UTR and it is already proved that one exon is not always equivalent to one protein domain.

they live in bathypelagic layer. is there another answer choice that says that?

Explanation: