Microbiology - Lab 10
Novobiocin is a bacteriostatic, narrow-spectrum antibiotic that targets _____ in some Gram-positive bacteria. -DNA gyrase -RNA primase -Okazaki fragments -None of the above
-DNA gyrase
____ is a genus that produces antibiotics. -Bacillus -Cephalosporium -Streptomyces -All of the above
All of the above
Agent naturally produced by microorganisms.
Antibiotic
Agent artificially synthesized or manipulated from other products.
Antimicrobial
Bacteriostatic antibiotics cause an inhibition of growth rather than cell lysis and death. -True -False
True
Many types of bacteria have gained resistance to antimicrobials at an astonishing rate. -True -False
True
Penicillin is produced by a _____. -bacteria -mold -virus -All of the above
mold
Penicillin disrupts the formation of bacterial cell walls by inhibiting the formation of _____ cross-links. -porin -protein -peptidoglycan -None of the above
peptidoglycan
Bacteriostatic agents treat infections by _____. -cell wall lysis -inhibiting ribosomal activity -preventing cell division -None of the above
preventing cell division
Gentamicin binds with bacterial _____. -ribosomes -cell walls -mitochondria -All of the above
ribosomes
Novobiocin is a bacteriostatic, narrow-spectrum antibiotic. -True -False
true
_____ are asexually-produced spores of the Penicillium fungus. -Aspergillus -Bacillus -Conidia -None of the above
Conidia
The mold that Alexander Fleming observed preventing bacterial growth was _____. -Aspergillus -Streptococcus pyogenes -Penicillium notatum -None of the above
Penicillium notatum
An antibiotic is a synthetic drug produced in a laboratory. -True -False
false
Resistant bacteria will exhibit a large zone of inhibition during a Kirby-Bauer diffusion test. -True -False
false
The effective zone of inhibition is the same for all antibiotics. -True -False
false
Zones of inhibition should be measured after they exceed 25 mm. -True -False
false
Agent that kills bacterial upon exposure.
Bactericidal
Agent that slows the growth of bacteria.
Bacteriostatic
Binds with bacterial ribosomes to prevent cell growth and cell division.
Gentamicin
Gentamicin is synthesized by a _____. -Gram-negative bacteria -Gram-positive bacteria -black mold -None of the above
Gram-positive bacteria
Targets DNA gyrase, preventing DNA replication within a cell.
Novobiocin
Disrupts cell wall stability, eventually leading to cell lysis.
Penicillin
A spreader is used when inoculating a Kirby-Bauer diffusion plate to _____. -isolate individual bacteria colonies -create a uniform bacterial lawn -confine bacteria to one section of the plate -None of the above
create a uniform bacterial lawn
