10th Grade Biology Crossword Puzzle?

[Melissa]

Hi. I'm having some trouble solving the last 3 questions on a crossword puzzle worksheet I have to do for homework. Here are the questions:

The ability to introduce new genes into an organism
(11 letters) _ _ _ i _ _ _ _ _ _ _

An acid important in protein synthesis
(11 letters) _ _ _ o _ u _ _ _ i _

A type of RNA that brings the amino acid to the messenger RNA strand
(8 letters) _ r _ _ _ _ _ _

If the letters that I have filled in are confusing you, just do it without them because I have been wrong before!

Thanks in advance!