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Structural ways DNA and RNA are different

https://www.youtube.com/watch?v=h3b9ArupXZg USE VIDEO TO ANSWER QUESTIONS

Explain two structural ways DNA and RNA are different.
How is base-pairing different in RNA and DNA?
If one nucleotide were transcribed incorrectly or omitted, how would it affect the overall structure of the protein? Create an example sequence of mRNA and proteins (using the codon chart) to demonstrate.