BIOL 2051 EXAM 3 - LUZAN QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE 2025-
2026
The metabolic process of denitrification
A) oxidizes N2.
B) oxidizes NO3-.
C) reduces N2.
D) reduces NO3-. - Answers 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 - Answers 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 - Answers 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 - Answers 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. - Answers 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 - Answers 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. - Answers 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. - Answers 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
- Answers A) the organism's endospores germinate in anoxic conditions.
People living indoors, in crowded, unsanitary conditions are most susceptible to
2026
The metabolic process of denitrification
A) oxidizes N2.
B) oxidizes NO3-.
C) reduces N2.
D) reduces NO3-. - Answers 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 - Answers 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 - Answers 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 - Answers 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. - Answers 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 - Answers 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. - Answers 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. - Answers 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
- Answers A) the organism's endospores germinate in anoxic conditions.
People living indoors, in crowded, unsanitary conditions are most susceptible to
