BIOL 134 Lecture 34: lecture 34 (11-21-16)

31 views6 pages
22 Nov 2016
School
Department
Course
Professor

Document Summary

Bacteriophages are viruses that infect the bacteria. Bacteriophages can be virulent (lytic) or temperate (lysogenic) Diverse: bacteria of many types have been found to have bacteriophages that infect them. Plentiful: found anywhere that bacteria live; present in drinking water and many of our foods. Important: bacteriophages may alter the genes of the bacteria they infect, causing new strains to arise. Since bacteriophages are non-(cid:373)otile, (cid:271)a(cid:272)te(cid:396)iophages (cid:449)ill fo(cid:396)(cid:373) (cid:272)i(cid:396)(cid:272)ula(cid:396) (cid:862)pla(cid:395)ues(cid:863) i(cid:374) a lawn of bacteria. Each plaque is formed by a single bacteriophage infecting a single bacterium. Virulent viruses kill the host cell quickly, usually by lysis (breaking open) the host cell. Temperate viruses may remain hidden and dormant for a very long time in their hosts. O(cid:373)e (cid:271)a(cid:272)te(cid:396)iophages, as a(cid:374) alte(cid:396)(cid:374)ati(cid:448)e to l(cid:455)ti(cid:272) g(cid:396)o(cid:449)th, (cid:272)a(cid:374) (cid:862)hide(cid:863) i(cid:374) the host a(cid:374)d lie dormant (temperate) In bacteriophages, this process is referred to as lysogeny. Lysogenic phage will remain integrated for a long time.

Get access

Grade+20% off
$8 USD/m$10 USD/m
Billed $96 USD annually
Grade+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
40 Verified Answers
Class+
$8 USD/m
Billed $96 USD annually
Class+
Homework Help
Study Guides
Textbook Solutions
Class Notes
Textbook Notes
Booster Class
30 Verified Answers