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