Question

A section of DNA has the following nitrogen base sequence: C G T G T A A T G. First determine the mRNA made from this and then determine the three amino acids that are joined based on the attached chart



1)ARG - GLY - PRO
2)ALA - ILE - GLN
3)ALA - HIS - TYR
4)PHE - GLY - PRO

Answer 1

ANSWER:  

1a. The template DNA strand, from which the mRNA is synthesized, is 5’ CAAACTACCCTGGGTTGCCAT 3’

(RNA synthesis proceeds in a 5’ à 3’ direction, so the template strand and the mRNA will be complementary to each other)

 

b. The coding DNA strand, which is complementary to the template strand, is 5’ ATGGCAACCCAGGGTAGTTTG 3’

 

c. The sequence of the mRNA is 5’ AUGGCAACCCAGGGUAGUUUG 3’

(the sequence of the mRNA is complementary to the template strand and identical to the coding strand with U substituted for T)