Question

A triplet of bases in a template strand of DNA is GAT. What would be the corresponding codon for mRNA?

СТА
CUA
CTU
CUA (This one is wrong)


I don't know why there are two CUAs, but if someone could please help. This is confusing for me. Please explain & no false answers. Thanks much in advance!

Answer 1

CUA

Step-by-step explanation:

Chances are your teacher accidentally put the same option twice and marked one of em incorrect. You infact selected the correct answer because CUA is correct.

DNA has 4 bases: ATGC (Apples on Trees = A - T, & Cows eat Grass = C-G)

RNA has 4 bases: AUGC (RNA lacks the base T so A binds with U instead).

So for template strand GAT, the mRNA made from this codon has complimentary pairing based on RNA so G binds with C, A binds with U, and T binds with A.