Answer:
1. You could tell whether a given sequence was DNA or mRNA because of Uracil and Thymine base differences in both
2. Answers may vary up to you, but messages are easier to decode written in DNA
3. You are imitating RNA polymerases.
4. You are imitating RNA polymerase once again
5. The RNA strand is delivered to start the process of translation; RNA>>Protien
6. Different mutations affect different amino acid sequences because they alter the code which makes it un-easy to decode the sequence
7. Some single nucleotide mutations affect an amino acid sequence depending on what mutation it is causing. Some single nucleotide mutations do not do this because they aren't as severe and they don't cause codons to mix up.