NEW
Font size
WorksheetsACN BIO 205 Chapter 2 Part 2
Total questions: 12
Worksheet time: 6mins
Gram positive organisms can be targeted by antibiotics in the following way:
Prevention of endotoxin release
Disrupting the synthesis of lipopolysaccharide
Disrupting the synthesis of peptidoglycans
Disrupting the metabolic activities of mitochondria
Gram negative organisms tend to be aggressive due to
the presence of endotoxins and immune reactions to lipopolysaccharide proteins
the nature of their peptidoglycan cell wall
the presense of mycolic acid which is difficult to treat with drugs
their origin from the GI tract which inherently makes the organism more virulent
If a bacteria forms spores, these spores are reproductive
True
False
Spore-forming bacteria are of concern because
spores reproduce aggressively
spores can remain viable in environments for many years
spores are difficult to kill
both b and c are correct
The process of gram-staining involves the following steps in sequence:
addition of counter-stains, decolorizer, iodine, and the primary stain
the primary stain, iodine, decolorizer, and a counter-stain
a decolorizer, iodine, a primary stain, then a counter-stain
iodine, a primary stain, a counter-stain, then a decolorizer
Acid-fast organisms such as TB are difficult to treat due to
their metabolic activities in destroying most antibiotic drugs
a prominent peptidoglycan cell wall
a very thick peptidoglycan layer
the presense of a waxy mycolic acid layer in their cell wall
Environmental factors such as pH, O2, temperature, and water are important in bacterial growth. For conditions such as Leprosy that affect peripheral tissues such as fingers, nose, and ears, the following factor is most important
the presense of blood
a basic high pH environment
the presense of O2
cooler temperatures
The presense of a zone of inhibition on the Kirby-Bauer test indicates that
an organism is capable of surviving anoxic conditions
the organism is susceptible to the antimicrobial
an organism cannot survive on the agar without additional nutrients
the organism is resistant to the antimicrobial
This Kirby-Bauer test demonstrates that the organism is
Susceptible to penicillin
resistant to trimethoprim/sulfamethoxazole
susceptible to bacitracin
resistant to vancomycin
Culture and susceptibility testing is important to
determine the dosage of antibiotics
to allow for adequate identification of microbes
to help determine what antibiotics would be best suited for treatment
both a and b are correct
both b and c are correct
Bacteria cause disease by
secreting endotoxins
secreting exotoxins
the destruction of tissues with various virulence factors
all of the above are correct
Signs of bacterial infection may involve any of the following EXCEPT
pain
high fever
bradycardia
tachypnea
