Final answer:
The correct replication strand when going from DNA to mRNA is option d) AUCGCU.
Step-by-step explanation:
When going from DNA to mRNA, the correct replication strand is the complementary strand to the DNA template strand. The DNA template strand is read in the 3' to 5' direction, while the mRNA strand is synthesized in the 5' to 3' direction, with complementary base pairing.
So, to find the correct replication strand, we need to identify the complementary bases for the given DNA sequence. Let's go through the options:
- a) TACGCT: The complementary bases for TACGCT are ATGCGA.
- b) ATGCGA: The complementary bases for ATGCGA are TACGCT.
- c) TAGCAT: The complementary bases for TAGCAT are ATCGTA.
- d) AUCGCU: This option uses RNA nucleotide symbols, which are different from DNA nucleotide symbols. The correct complementary bases for AUCGCU (using DNA nucleotide symbols) are TAGCGA.
Therefore, the correct replication strand when going from DNA to mRNA is option d) AUCGCU.