Why should a selectable marker be present on a cloning vector?

Related questions

1. What is a high copy number?
2. What is CMV promoter?
3. Why are plasmids called Episomes?
4. What is insertional inactivation?
5. How is the Ti plasmid used in genetic engineering?
6. What is the function of ROP in pBR322?
7. Whats is GMO?
8. What is copy number biotechnology?
9. What is replication bubble?
10. Why is cDNA used for cloning?

Tags

1. #genes
2. #contain
3. #commonly
4. #confer
5. #resistance
6. #selective
7. #conditions
8. #cells
9. #survive
10. #plasmids
11. #appropriate
12. #plasmid
13. #selectable
14. #cloning
15. #antibiotics
16. #various
17. #vectors
18. #marker
19. #presence
20. #becomes
21. #under
22. #markers
23. #useful