A strand of DNA contains the following bases. ATT CCG GGA TTT

Question

a) what amino acids are coded for?

First of all, would the mRNA strand be UAA GGC CCU AAA?

Answer 1

mRNA is short for "messenger ribonucleic acid", and is the transcription copy of the DNA sequence you provided. When transcripting from DNA to mRNA, the bases are matched up like this:
A-->U (uracil; only found in RNA, which lacks T)
T-->A
C-->G
G-->C

To translate your sequence:
DNA ATT CCG GGA TTT

mRNA UAA GGC CCU AAA