Department of Energy Argonne National Laboratory Office of Science NEWTON's Homepage NEWTON's Homepage
NEWTON, Ask A Scientist!
NEWTON Home Page NEWTON Teachers Visit Our Archives Ask A Question How To Ask A Question Question of the Week Our Expert Scientists Volunteer at NEWTON! Frequently Asked Questions Referencing NEWTON About NEWTON About Ask A Scientist Education At Argonne Zone of Inhibition Growth
Name: Namita
Status: Other
Grade:  Other
Location: IN
Country: United States
Date: August 2008


Question:
What does it mean when you find isolated bacterial colonies growing in a zone of inhibition?



Replies:
There is variety in every population. In bacteria some differ in their tolerance for antibiotic. Most of the bacteria within the zone of inhibition have been killed or are being repelled from growing in the area of the antibiotic, but the ones you see are resistant to it. If you were to take one of those colonies and repeat the experiment, you would probably see that is no zone of inhibition because all of the offspring of those original bacteria are genetically the same as the original.

vanhoeck


They are probably genetic mutants that are resistant to the antibiotic or contaminating bacteria that are not sensitive to the antibiotic.

Ron Baker, Ph.D.



Click here to return to the Molecular Biology Archives

NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.

For assistance with NEWTON contact a System Operator (help@newton.dep.anl.gov), or at Argonne's Educational Programs

NEWTON AND ASK A SCIENTIST
Educational Programs
Building 360
9700 S. Cass Ave.
Argonne, Illinois
60439-4845, USA
Update: June 2012
Weclome To Newton

Argonne National Laboratory