Luzan Biol 2051 Exam 3 UPDATED
ACTUAL Questions and CORRECT
Answers
The metabolic process of denitrification
A) oxidizes N2.
B) oxidizes NO3-.
C) reduces N2.
D) reduces NO3-. - CORRECT ANSWER✔✔- D) reduces NO3-.
Which of the following is/are NOT a degradation product of organic material?
A) Carbon dioxide
B) Methane
C) Oxygen
D) Ammonia - CORRECT ANSWER✔✔- C) Oxygen
Which type of hypersensitivity and autoimmune disorders is mismatched with their
characteristics?
A) Hypersensitivity type IV , T cytotoxic cells (cell mediated immunity), causing contact
dermatitis - poison ivy reaction
B) Hypersensitivity type I (antibodies to harmless antigens) - diabetes type I (Early onset
diabetes)
C) Rheumatoid arthritis - autoantibodies against self Ig G antibodies , form complexes and
deposited in the cartilage - CORRECT ANSWER✔✔- B) Hypersensitivity type I (antibodies
to harmless antigens) - diabetes type I (Early onset diabetes)
Which antibiotic is mismatched with its mechanism of action?
A) Tetracycline- blocks peptidoglycan cell wall biosynthesis
B) Quinolones- act on lipids biosynthesis
C) Sulfanilamides - interferes with folic acid biosynthesis - CORRECT ANSWER✔✔- A)
Tetracycline- blocks peptidoglycan cell wall biosynthesis
,The basis for blood typing is referred to as ____ (think of a "messy" immune testing)
A) neutralization.
B) hemagglutination.
C) immunodiffusion.
D) precipitation. - CORRECT ANSWER✔✔- B) hemagglutination.
MSA agar, a medium that contains mannitol and a high content of salt, and is used for
isolation of Staphylococcus aureus, is an example of a ________ medium.
A) selective
B) differential
C) selective and differential
D) neither selective nor differential - CORRECT ANSWER✔✔- C) selective and differential
(Note: Same thing refers to EMB agar as well. We can differentiate pseudomonas and Ecoli
on it)
Impetigo is due to an infection caused by
A) Staphylococcus aureus but not Streptococcus pyogenes.
B) Streptococcus pyogenes but not Staphylococcus aureus.
C) either Staphylococcus aureus or Streptococcus pyogenes.
D) neither Staphylococcus aureus nor Streptococcus pyogenes. - CORRECT ANSWER✔✔-
C) either Staphylococcus aureus or Streptococcus pyogenes.
Which of the following statements about chlamydial infections is TRUE?
A) Chlamydial diseases are mild and go away on its own without treatment
B) Chlamydial diseases are less prevalent than gonorrhea.
C) Chlamydial diseases can lead to acute complications. - CORRECT ANSWER✔✔- C)
Chlamydial diseases can lead to acute complications.
Tetanus develops from a puncture wound because
A) the organism's endospores germinate in anoxic conditions.
B) the organism gains access to the circulatory system and then invades the digestive system.
, C) the organism needs access to circulatory system to get to the lungs since it requires oxygen
- CORRECT ANSWER✔✔- A) the organism's endospores germinate in anoxic conditions.
People living indoors, in crowded, unsanitary conditions are most susceptible to
A) Tuberculosis
B) Anthrax
C) Tetanus
D) Zika virus disease - CORRECT ANSWER✔✔- A) Tuberculosis
Pathogenicity is the ability
A) of the host to inflict damage on the pathogen.
B) of the host to resist damage by the pathogen.
C) of the pathogen to inflict damage on the host.
D) None of these are correct. - CORRECT ANSWER✔✔- C) of the pathogen to inflict
damage on the host.
Decalcification of the tooth enamel is caused by
A) lipopolysaccharide.
B) dextrans.
C) formic acid.
D) lactic acid. - CORRECT ANSWER✔✔- D) lactic acid.
MSA (mannitol salt agar), MacConkey agar and eosin-methylene blue (EMB) agar are
________ media.
A) selective
B) differential
C) both selective and differential
D) neither selective nor differential - CORRECT ANSWER✔✔- C) both selective and
differential
The disk-diffusion test is used for
ACTUAL Questions and CORRECT
Answers
The metabolic process of denitrification
A) oxidizes N2.
B) oxidizes NO3-.
C) reduces N2.
D) reduces NO3-. - CORRECT ANSWER✔✔- D) reduces NO3-.
Which of the following is/are NOT a degradation product of organic material?
A) Carbon dioxide
B) Methane
C) Oxygen
D) Ammonia - CORRECT ANSWER✔✔- C) Oxygen
Which type of hypersensitivity and autoimmune disorders is mismatched with their
characteristics?
A) Hypersensitivity type IV , T cytotoxic cells (cell mediated immunity), causing contact
dermatitis - poison ivy reaction
B) Hypersensitivity type I (antibodies to harmless antigens) - diabetes type I (Early onset
diabetes)
C) Rheumatoid arthritis - autoantibodies against self Ig G antibodies , form complexes and
deposited in the cartilage - CORRECT ANSWER✔✔- B) Hypersensitivity type I (antibodies
to harmless antigens) - diabetes type I (Early onset diabetes)
Which antibiotic is mismatched with its mechanism of action?
A) Tetracycline- blocks peptidoglycan cell wall biosynthesis
B) Quinolones- act on lipids biosynthesis
C) Sulfanilamides - interferes with folic acid biosynthesis - CORRECT ANSWER✔✔- A)
Tetracycline- blocks peptidoglycan cell wall biosynthesis
,The basis for blood typing is referred to as ____ (think of a "messy" immune testing)
A) neutralization.
B) hemagglutination.
C) immunodiffusion.
D) precipitation. - CORRECT ANSWER✔✔- B) hemagglutination.
MSA agar, a medium that contains mannitol and a high content of salt, and is used for
isolation of Staphylococcus aureus, is an example of a ________ medium.
A) selective
B) differential
C) selective and differential
D) neither selective nor differential - CORRECT ANSWER✔✔- C) selective and differential
(Note: Same thing refers to EMB agar as well. We can differentiate pseudomonas and Ecoli
on it)
Impetigo is due to an infection caused by
A) Staphylococcus aureus but not Streptococcus pyogenes.
B) Streptococcus pyogenes but not Staphylococcus aureus.
C) either Staphylococcus aureus or Streptococcus pyogenes.
D) neither Staphylococcus aureus nor Streptococcus pyogenes. - CORRECT ANSWER✔✔-
C) either Staphylococcus aureus or Streptococcus pyogenes.
Which of the following statements about chlamydial infections is TRUE?
A) Chlamydial diseases are mild and go away on its own without treatment
B) Chlamydial diseases are less prevalent than gonorrhea.
C) Chlamydial diseases can lead to acute complications. - CORRECT ANSWER✔✔- C)
Chlamydial diseases can lead to acute complications.
Tetanus develops from a puncture wound because
A) the organism's endospores germinate in anoxic conditions.
B) the organism gains access to the circulatory system and then invades the digestive system.
, C) the organism needs access to circulatory system to get to the lungs since it requires oxygen
- CORRECT ANSWER✔✔- A) the organism's endospores germinate in anoxic conditions.
People living indoors, in crowded, unsanitary conditions are most susceptible to
A) Tuberculosis
B) Anthrax
C) Tetanus
D) Zika virus disease - CORRECT ANSWER✔✔- A) Tuberculosis
Pathogenicity is the ability
A) of the host to inflict damage on the pathogen.
B) of the host to resist damage by the pathogen.
C) of the pathogen to inflict damage on the host.
D) None of these are correct. - CORRECT ANSWER✔✔- C) of the pathogen to inflict
damage on the host.
Decalcification of the tooth enamel is caused by
A) lipopolysaccharide.
B) dextrans.
C) formic acid.
D) lactic acid. - CORRECT ANSWER✔✔- D) lactic acid.
MSA (mannitol salt agar), MacConkey agar and eosin-methylene blue (EMB) agar are
________ media.
A) selective
B) differential
C) both selective and differential
D) neither selective nor differential - CORRECT ANSWER✔✔- C) both selective and
differential
The disk-diffusion test is used for
