Microbiology 304 2025 final exam ACTUAL
QUESTIONS AND CORRECT ANSWERS
An antibiotic that attacks the LPS layer would be expected to have a broad spectrum of activity
effective against Gram negative and gram positive cells - Correct answers✔✔False
Due to its target on mRNA, rifamycins such as rifampin can be effective over a broad spectrum. -
Correct answers✔✔true
Community-acquired MRSA is typically less virulent than healthcare-associated MRSA. -
Correct answers✔✔false
Antiviral drugs target viral processes that occur during viral infection. - Correct answers✔✔true
Phage therapy has been used in the past as an effective, common antiviral treatment. - Correct
answers✔✔false
Exotoxins are more potent than endotoxins. In general, the LD50 for exotoxins is much greater
than the LD50 for endotoxins. - Correct answers✔✔false
The Limulus amoebocyte assay is used to detect minute amounts of endotoxin in drugs and
medical devices. - Correct answers✔✔true
Endotoxins are lipopolysaccharides. Therefore, most symptoms of endotoxins can be treated with
administration of anti-endotoxin antibodies. - Correct answers✔✔false
,Diseases that are referred to as emerging infectious diseases have only been discovered in the
past fifty years. - Correct answers✔✔false
Reservoirs of infections are always inanimate objects. - Correct answers✔✔false
Both normal and transient flora in an individual can become opportunistic pathogens. - Correct
answers✔✔true
A viroid is a completely developed infectious viral agent composed of nucleic acid and
surrounded by a capsid. - Correct answers✔✔false
Dogs do not get measles because their cells lack the correct receptor sites for that virus. - Correct
answers✔✔true
Viruses are the only known infectious agents that are obligatory, intracellular parasites. - Correct
answers✔✔true
Desiccation, removal of water, is a reliable form of sterilization. - Correct answers✔✔false
Moist heat destroys organisms by denaturing proteins. - Correct answers✔✔true
Use of 70% alcohol is a physical method for control of microorganisms. - Correct
answers✔✔false
Autoclaving is the most effective method of moist heat sterilization. - Correct answers✔✔true
, Microorganisms placed in high concentrations of salts and sugars will undergo lysis. - Correct
answers✔✔false
Bacterial growth refers to an increase in the numbers of cells in a bacterial culture. - Correct
answers✔✔true
Most pathogenic bacteria are thermophiles. - Correct answers✔✔false
Nitrogen-fong bacteria, such as cyanobactería, can use atmospheric nitrogen (N2) for their
nitrogen source. - Correct answers✔✔true
The use of enzymes is necessary to increase the activation energy requirements of a chemical
reaction. - Correct answers✔✔false
Glycolysis is utilized by cells in bterm-24oth respiration and fermentation. - Correct
answers✔✔true
The cell walls of bacteria are responsible for the shape of the bacteria and the difference in the
Gram stain reaction. - Correct answers✔✔true
Antibiotics that target the cell wall are effective treatment against many pathogenic bacteria. -
Correct answers✔✔true
Spheroplasts, protoplasts, and mycoplasma are bacterial cells without cell walls. - Correct
answers✔✔true
QUESTIONS AND CORRECT ANSWERS
An antibiotic that attacks the LPS layer would be expected to have a broad spectrum of activity
effective against Gram negative and gram positive cells - Correct answers✔✔False
Due to its target on mRNA, rifamycins such as rifampin can be effective over a broad spectrum. -
Correct answers✔✔true
Community-acquired MRSA is typically less virulent than healthcare-associated MRSA. -
Correct answers✔✔false
Antiviral drugs target viral processes that occur during viral infection. - Correct answers✔✔true
Phage therapy has been used in the past as an effective, common antiviral treatment. - Correct
answers✔✔false
Exotoxins are more potent than endotoxins. In general, the LD50 for exotoxins is much greater
than the LD50 for endotoxins. - Correct answers✔✔false
The Limulus amoebocyte assay is used to detect minute amounts of endotoxin in drugs and
medical devices. - Correct answers✔✔true
Endotoxins are lipopolysaccharides. Therefore, most symptoms of endotoxins can be treated with
administration of anti-endotoxin antibodies. - Correct answers✔✔false
,Diseases that are referred to as emerging infectious diseases have only been discovered in the
past fifty years. - Correct answers✔✔false
Reservoirs of infections are always inanimate objects. - Correct answers✔✔false
Both normal and transient flora in an individual can become opportunistic pathogens. - Correct
answers✔✔true
A viroid is a completely developed infectious viral agent composed of nucleic acid and
surrounded by a capsid. - Correct answers✔✔false
Dogs do not get measles because their cells lack the correct receptor sites for that virus. - Correct
answers✔✔true
Viruses are the only known infectious agents that are obligatory, intracellular parasites. - Correct
answers✔✔true
Desiccation, removal of water, is a reliable form of sterilization. - Correct answers✔✔false
Moist heat destroys organisms by denaturing proteins. - Correct answers✔✔true
Use of 70% alcohol is a physical method for control of microorganisms. - Correct
answers✔✔false
Autoclaving is the most effective method of moist heat sterilization. - Correct answers✔✔true
, Microorganisms placed in high concentrations of salts and sugars will undergo lysis. - Correct
answers✔✔false
Bacterial growth refers to an increase in the numbers of cells in a bacterial culture. - Correct
answers✔✔true
Most pathogenic bacteria are thermophiles. - Correct answers✔✔false
Nitrogen-fong bacteria, such as cyanobactería, can use atmospheric nitrogen (N2) for their
nitrogen source. - Correct answers✔✔true
The use of enzymes is necessary to increase the activation energy requirements of a chemical
reaction. - Correct answers✔✔false
Glycolysis is utilized by cells in bterm-24oth respiration and fermentation. - Correct
answers✔✔true
The cell walls of bacteria are responsible for the shape of the bacteria and the difference in the
Gram stain reaction. - Correct answers✔✔true
Antibiotics that target the cell wall are effective treatment against many pathogenic bacteria. -
Correct answers✔✔true
Spheroplasts, protoplasts, and mycoplasma are bacterial cells without cell walls. - Correct
answers✔✔true
