MICROBIOLOGY TEST QUESTIONS WITH
CORRECT ANSWERS 2025/2026
D - CORRECT ANSWER -Which of the following is a eukaryotic domain in the three-domain
system?
A. Archaea
B. Fungi
C. Bacteria
D. Eukarya
A - CORRECT ANSWER -Who was the first to observe microorganisms with a microscope?
A. van Leeuwenhoek
B. Hooke
C. Koch
D. Pasteur
E. None of the above
B - CORRECT ANSWER -These are the primary molecules making up membranes in cells:
A. Proteins
B. Phospholipids
C. Nucleic acids
D. Carbohydrates
E. None of the above
A - CORRECT ANSWER -Aerobic respiration differs from anaerobic respiration in which of the
following respects?
,A. The final electron acceptors are different
B. Aerobic respiration creates fewer molecules of ATP
C. ANaerobic respiration includes glycolysis
D. Aerobic respiration requires the electron transport chain
B - CORRECT ANSWER -Which of the following has to consume carbohydrates for both carbon
and energy?
A. Photoautotroph
B. Chemoheterotroph
C. Chemoautotroph
D. Photoheterotroph
B - CORRECT ANSWER -salts and sugars work to preserve foods by creating a
A. depletion of nutrients
B. hypertonic environment
C. hypotonic environment
D. lower pH
D - CORRECT ANSWER -The term facultative anaerobe refers to an organism
A. is killed by oxygen
B. doesnt use oxygen but tolerates it
C. requires less oxygen than is present in air
D. can use oxygen or can grow without oxygen
C - CORRECT ANSWER -which group of the following bacterial growth types and temperatures is
mismatched?
A. Psychrotroph- optimal growth 22C
, B. Psychrophile- optimal growth 12C
C. Thermophile- optimal growth 37C
D. Hyperthermophile- optimal growth 95C
A - CORRECT ANSWER -Which group of microorganisms is most likely to spoil a freshwater trout
preserved with salt?
A. Halophiles
B. Psychrophiles
C. Anaerobes
D. Thermophiles
A - CORRECT ANSWER -Which of the following is a good method to sterilize the interior of dense
materials without using high heat?
A. ionizing radiation
B. Pasteurization
C. autoclave
D. none of the above
B - CORRECT ANSWER -One important ecosystem function performed by microorganisms (such
as algae and cyanobacteria) is the primary production of biomass through the metabolic
process of
A. Anaerobic respiration
B. Photosynthesis
C. Aerobic respiration
D. fermentation
CORRECT ANSWERS 2025/2026
D - CORRECT ANSWER -Which of the following is a eukaryotic domain in the three-domain
system?
A. Archaea
B. Fungi
C. Bacteria
D. Eukarya
A - CORRECT ANSWER -Who was the first to observe microorganisms with a microscope?
A. van Leeuwenhoek
B. Hooke
C. Koch
D. Pasteur
E. None of the above
B - CORRECT ANSWER -These are the primary molecules making up membranes in cells:
A. Proteins
B. Phospholipids
C. Nucleic acids
D. Carbohydrates
E. None of the above
A - CORRECT ANSWER -Aerobic respiration differs from anaerobic respiration in which of the
following respects?
,A. The final electron acceptors are different
B. Aerobic respiration creates fewer molecules of ATP
C. ANaerobic respiration includes glycolysis
D. Aerobic respiration requires the electron transport chain
B - CORRECT ANSWER -Which of the following has to consume carbohydrates for both carbon
and energy?
A. Photoautotroph
B. Chemoheterotroph
C. Chemoautotroph
D. Photoheterotroph
B - CORRECT ANSWER -salts and sugars work to preserve foods by creating a
A. depletion of nutrients
B. hypertonic environment
C. hypotonic environment
D. lower pH
D - CORRECT ANSWER -The term facultative anaerobe refers to an organism
A. is killed by oxygen
B. doesnt use oxygen but tolerates it
C. requires less oxygen than is present in air
D. can use oxygen or can grow without oxygen
C - CORRECT ANSWER -which group of the following bacterial growth types and temperatures is
mismatched?
A. Psychrotroph- optimal growth 22C
, B. Psychrophile- optimal growth 12C
C. Thermophile- optimal growth 37C
D. Hyperthermophile- optimal growth 95C
A - CORRECT ANSWER -Which group of microorganisms is most likely to spoil a freshwater trout
preserved with salt?
A. Halophiles
B. Psychrophiles
C. Anaerobes
D. Thermophiles
A - CORRECT ANSWER -Which of the following is a good method to sterilize the interior of dense
materials without using high heat?
A. ionizing radiation
B. Pasteurization
C. autoclave
D. none of the above
B - CORRECT ANSWER -One important ecosystem function performed by microorganisms (such
as algae and cyanobacteria) is the primary production of biomass through the metabolic
process of
A. Anaerobic respiration
B. Photosynthesis
C. Aerobic respiration
D. fermentation
