One of my study questions for a biology test was:
A gene contains 1200 bases. How many codons will be on the mRNA immediately after transcription?
My initial answer was 400 codons, because 1200 bases = 1200 nucleotides and 1200/3 = 400. But since DNA is double helix, and only one of the two strands is used in mRNA creation, would only 600 bases be used instead of the full 1200?