Which of the following are true about traditional (non-mutated) Cas9?
1. it is an enzyme called an endonuclease
2.a PAM sequence is necessary for it to bind and perform it's function
3. it is an enzyme called an exonuclease
4. it forms a complex with guide RNA to perform its function
5. it can bind to anywhere in then genome that you want to edit
6. it forms a complex with guide DNA to perform its function
7. it is a DNA sequence that binds CRISPR proteins
8. it functions as a protein
9. it is a piece of viral DNA gets expressed inside bacterial cells to prevent future infections
10. it is an RNA molecule that binds to target DNA