This document discusses bacteriophages and their lytic and lysogenic life cycles. It defines mycobacteriophages as viruses that infect mycobacteria and can be found in soil. The document explains that mycobacteriophages have two life cycles: the lytic cycle, where the phage reproduces and causes host cell lysis, and the lysogenic cycle. It provides a diagram showing the structure of bacteriophages with their DNA inside a head and tail.

1. THE INSIDE LOOK OF
BACTERIOPHAGES
LYTIC AND LYSOGENIC CYCLES OF
BACTERIOPHAGE
Nicole Colón, Astrid Díaz, Lysander Borrero y Alberto
Cintrón

2. OBJECTIVES:
• Explain what mycobacteriophages are and why
are they important.
• Distinguish between bacteriophage lytic and
lysogenic cycles.

3. MYCOBACTERIOPHAGES
• Viruses that infect bacteria belonging to the
mycobacteria genus.
• Can be found in the environment, including soil.
• Can cause diseases
• Are used as a model to study biological process
Institute for Molecular Virology. University of
Wisconsin . 2005

4. BACTERIOPHAGE STRUCTURE
DNA
Head
Tail

5. LIFE STYLES
• Mycobactheriophage can be group according to
their life styles.
• Two different life cycle:
a) Lytic cycle
b) Lysogenic cycle

6. Lytic Cycle
 Used by virulent phages
 Is characterized by phage
reproduction followed by host
cell lysis.

7. LYSOGENIC CYCLE

8. LIFE CYCLE VIDEO
• http://highered.mcgraw-
hill.com/sites/0072556781/student_view0/chapter17
/animation_quiz_2.html

9. REFERENCES
• Rubin M.2012.Cluster Classification of
Mycobacteriophages Isolated From Tropical Soils of
Puerto Rico.
• Prescott.Harley.Klein.2005.Microbiology. 6th edition.
McGraw-Hill Higher Education.
• About Biology. Regina Bailey. (unknown).
Bacteriophages.

10. ACKNOWLEDGMENTS
• Dr. Rubin
• TA: Melisa Medina
• TA: Valeria Rivera
• RISE Program

11. THANKS FOR YOUR ATTENTION !

12. QUESTIONS ?

13. Table 1

14. Figure 1

15. Table 2
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