BIOL 2051 EXAM 3 2025 QUESTIONS
AND ANSWERS
Rabies disease is a ____ (pick only one answer)
A. Slowly progressing zoonotic viral disease, with main reservoir being wild animals, such as
skunks, raccoons
B. No treatment for rabies is currently available
C. Caused by an anaerobic endospore forming rod shaped bacterium, and a fecal oral
transmission route
D. Fast-progressing, first symptoms in 1 hr after exposure, death within 3 days
E. Airborne transmission (via inhalation of spores) - ANS A
What is NOT a diseased caused by Staphylococcus aureus?
A. Necrotizing fascitis
B. Osteomyelitis
C. Scalded skin syndrome
D. Toxic shock syndrome
E. Impetigo - ANS A
The metabolic process of nitrogen reduction...
A. Is a reaction catalyzed by the denitrogenase and it converts nitrogen gas into ammonia
1 @COPYRIGHT THESTAR 2025/2026
,B. Converts ammonia into nitrate
C. Converts nitrogen gas into nitrate
D. Converts nitrate into gold
E. Converts nitrogen gas into amino acid - ANS A and E
Match symptoms to the disease
A disease characterized with black lesions with surrounding edema (swelling) -
ANS Cutaneous anthrax
Match symptoms to the disease
Severe deep tissue infection leading to necrosis and accumulation of toxic products, caused by
the anaerobic rod, sometimes requiring amputation - ANS Gas gangrene
This disease starts as a "lockjaw" due to bacterial exotoxin blocking inhibitions of muscle
contraction (muscles contract uncontrollably, resulting in a rigid paralysis) - ANS Tetanus
Impetigo, a superficial bacterial infection that causes skin to flake or peel off can be caused by...
A. Either Staphylococcus aureus or streptococcus progenes
B. Measels and zika virus
C. Staphyloccous aureus
D. Neither Staphylococcus aureus and Streptococcus pyogenes
E. Streptococcus pyogenes - ANS A
Which of the follow is NOT a nucleic acid based method of identification?
A. DNA microarray
2 @COPYRIGHT THESTAR 2025/2026
, B. Rapid test (immunochromatography)
C. RT-PCR
D. FISH (fluorescent in situ hybridization) - ANS B
True or False: DNA methods alone (PCR, and sequencing) are not enough to diagnose
pathogens: the golden standard of any pathogen's duagostic has to be performed (or at least
attempted): to isolate a pathogen in a pure culture with the use of differential/selective
medium. - ANS True
What is the major product of organic matter decomposition in anaerobic environment?
A. CH4, methane
B. O2
C. FeS (pyrite)
D. CO2
E. CaCO3 (calcium carbonate) - ANS A
Some of the most common nosocomial infections are caused by fungal pathogens like candida
etc. (a type of yeast). Which would be an antimicrobial agent of choice?
A. A reverse transcriptase inhibitor
B. A flagella inhibitor
C: A bacterial protein synthesis inhibitor like aminoglyside
D. An drug that interferes with ergosterol synthesis
E. A neuraminidase inhibitor - ANS D
Mannitol salt agar is medium of choice for the isolation of
A. Staphylococcus aureus
3 @COPYRIGHT THESTAR 2025/2026
AND ANSWERS
Rabies disease is a ____ (pick only one answer)
A. Slowly progressing zoonotic viral disease, with main reservoir being wild animals, such as
skunks, raccoons
B. No treatment for rabies is currently available
C. Caused by an anaerobic endospore forming rod shaped bacterium, and a fecal oral
transmission route
D. Fast-progressing, first symptoms in 1 hr after exposure, death within 3 days
E. Airborne transmission (via inhalation of spores) - ANS A
What is NOT a diseased caused by Staphylococcus aureus?
A. Necrotizing fascitis
B. Osteomyelitis
C. Scalded skin syndrome
D. Toxic shock syndrome
E. Impetigo - ANS A
The metabolic process of nitrogen reduction...
A. Is a reaction catalyzed by the denitrogenase and it converts nitrogen gas into ammonia
1 @COPYRIGHT THESTAR 2025/2026
,B. Converts ammonia into nitrate
C. Converts nitrogen gas into nitrate
D. Converts nitrate into gold
E. Converts nitrogen gas into amino acid - ANS A and E
Match symptoms to the disease
A disease characterized with black lesions with surrounding edema (swelling) -
ANS Cutaneous anthrax
Match symptoms to the disease
Severe deep tissue infection leading to necrosis and accumulation of toxic products, caused by
the anaerobic rod, sometimes requiring amputation - ANS Gas gangrene
This disease starts as a "lockjaw" due to bacterial exotoxin blocking inhibitions of muscle
contraction (muscles contract uncontrollably, resulting in a rigid paralysis) - ANS Tetanus
Impetigo, a superficial bacterial infection that causes skin to flake or peel off can be caused by...
A. Either Staphylococcus aureus or streptococcus progenes
B. Measels and zika virus
C. Staphyloccous aureus
D. Neither Staphylococcus aureus and Streptococcus pyogenes
E. Streptococcus pyogenes - ANS A
Which of the follow is NOT a nucleic acid based method of identification?
A. DNA microarray
2 @COPYRIGHT THESTAR 2025/2026
, B. Rapid test (immunochromatography)
C. RT-PCR
D. FISH (fluorescent in situ hybridization) - ANS B
True or False: DNA methods alone (PCR, and sequencing) are not enough to diagnose
pathogens: the golden standard of any pathogen's duagostic has to be performed (or at least
attempted): to isolate a pathogen in a pure culture with the use of differential/selective
medium. - ANS True
What is the major product of organic matter decomposition in anaerobic environment?
A. CH4, methane
B. O2
C. FeS (pyrite)
D. CO2
E. CaCO3 (calcium carbonate) - ANS A
Some of the most common nosocomial infections are caused by fungal pathogens like candida
etc. (a type of yeast). Which would be an antimicrobial agent of choice?
A. A reverse transcriptase inhibitor
B. A flagella inhibitor
C: A bacterial protein synthesis inhibitor like aminoglyside
D. An drug that interferes with ergosterol synthesis
E. A neuraminidase inhibitor - ANS D
Mannitol salt agar is medium of choice for the isolation of
A. Staphylococcus aureus
3 @COPYRIGHT THESTAR 2025/2026
