Biology homework, help please.......?

I've read the chapter in the book ,but I'm unsure about the answers I picked. Thanks for helping me out.

I picked (C)

1)Which one of the following is NOT a function of tRNA?
A. picking up the amino acid specified by the anticodon
B. recognizing the appropriate codons in mRNA
C. transferring nucleotides to rRNA
D. translating codons into amino acids

I picked (E)
2) Which of the following account for most mutations?
A. mutations that alter polypeptide primary structure and mutations that do not
B. nucleotide misreads and sugar substitutions
C. base substitutions and base deletions
D. translations and inversions
E. None of the choices are correct.

I picked (A)
3) Which one of the following is NOT true?
A. Viral nucleic acid usually has more in common with the nucleic acid of other viruses that
infect other hosts than to the nucleic acids of its host.
B. New viral diseases emerge when a virus infects a new host species.
C. About three-quarters of new human diseases have originated in other animals.
D. Most new viral diseases arise as a result of mutation of existing viruses.
E. AIDS and hantavirus have been around for decades before becoming widely known.

Thanks for your help!!!!

1/b because transferring nucleotides is the Translator RNA 's job
2/c because that is what mutation is all about it is change
3/a viral is a sugar

hope i am right and that it helps