MICROBIOLOGY EXAM 3 - RIO SALADO QUESTIONS
WITH CORRECT ANSWERS 2025/2026
Which method can be used for long-term storage? - CORRECT ANSWER -lyophilization
Which of the following is an antiseptic that may be inactivated by some skin bacteria? -
CORRECT ANSWER -Hydrogen peroxide
What is the premise behind pasteurization? - CORRECT ANSWER -It makes products safer to
consume.
Which of the following would be used to sterilize glassware that will be used in a microbiology
lab? - CORRECT ANSWER -Autoclave
Antibiotics such as Streptomycin and Erythromycin stop bacterial infections because they
prevent the bacterial cell from doing which of the following? - CORRECT ANSWER -Assembling
polypeptides
Which of the following is a difference between penicillin and a vancomycin? - CORRECT
ANSWER -Penicillin interferes with an enzyme involved in cell wall synthesis, whereas
vancomycin does not
Semisynthetic antibiotics differ from natural antibiotics because of which of the following? -
CORRECT ANSWER -Natural antibiotics are derived from nature
Which of the following is the difference between soaps and quats? - CORRECT ANSWER -Quats
can kill microbes
Why should meat be thawed in the refrigerator? - CORRECT ANSWER -it will decrease the
possibility of bacteria growth as it thaws
,Antibiotic "A" and antibiotic "B" are both effective at suppressing an infection in a patient,
however together, they have an even more significant effect. This is due to which of the
following? - CORRECT ANSWER -Synergistic interactions
What is the difference between commercial sterilization and sterilization using a sterilant? -
CORRECT ANSWER -A sterilant would be used on a surface
Polymyxin E is useful against gram-negative bacteria because of which of the following? -
CORRECT ANSWER -It breaks down the outer membrane
Which test can determine if a disinfectant is contaminated? - CORRECT ANSWER -In-use test
Dry heat and moist heat differ because of which of the following? - CORRECT ANSWER -Moist
heat penetrates cells more effectively
Using a narrow-spectrum antibiotic is better than a broad-spectrum antibiotic because of which
of the following? - CORRECT ANSWER -Narrow-spectrum antibiotics will have less of a chance of
killing normal microbiota
A person is hiking and runs out of drinking water. They find a stream and decide to use the
chlorine tablets they brought to sanitize the water. This would be a good way to make the water
safe to drink because of which of the following? - CORRECT ANSWER -The chlorine will break up
the molecules of the microbes in the water
When a phlebotomist cleans an area of the skin with alcohol before drawing blood on a patient,
their goal is to do which of the following? - CORRECT ANSWER -Lower the number of bacteria
on the skin
,Why is washing your hands with (non-antibacterial) soap and water an effective way to reduce
bacteria? - CORRECT ANSWER -It is degerming your hands
Which of the following would target Mycobacterium tuberculosis? - CORRECT ANSWER -
Isoniazid
Mouthwash, antibacterial soap, and Lysol are all related because of which of the following? -
CORRECT ANSWER -They contain phenolic compounds
Which of the following would be the least selectively toxic treatment for a bacterial infection? -
CORRECT ANSWER -Polymyxin B
Which of the following would be used to control microbial counts in a liquid that could not be
exposed to heat? - CORRECT ANSWER -Filtration
If a person has athlete's foot, the cream they use to treat it will suppress the mold enough for
the immune defenses to rid the skin of the infection because of which of the following? -
CORRECT ANSWER -The cream is fungistatic
Why can quinolones target bacterial replication? - CORRECT ANSWER -Bacteria have different
enzymes
Which scientist's research showed penicillin was an effective antibiotic in treating infections in
animals? - CORRECT ANSWER -Chain
what microbes can be pathogenic? - CORRECT ANSWER -protozoa, fungi, bacteria, helminths,
viruses
what are most infections caused by? - CORRECT ANSWER -bacteria or viruses
, is illness the same as disease - CORRECT ANSWER -no
what does infection mean? - CORRECT ANSWER -infection means that. person has been
colonized with a microbial population
most bacteria that cause disease in humans are ___ - CORRECT ANSWER -mesophilic
what control microbial growth? - CORRECT ANSWER -heat
how does heat affect cells? - CORRECT ANSWER -denaturation of proteins
the intensity depending on time, temp, and moisture
kill means - CORRECT ANSWER -complete death of a microbe
bactericidal - CORRECT ANSWER -indicated that bacterial population is dead
bacteriostatic - CORRECT ANSWER -this means the population is low and not increasing in size
sterilzation - CORRECT ANSWER -completely kill everything which is not always neccessary
sanitize - CORRECT ANSWER -reduce the population to food safe levels
cooking food can ____ - CORRECT ANSWER -kill most bacteria that will cause infection
WITH CORRECT ANSWERS 2025/2026
Which method can be used for long-term storage? - CORRECT ANSWER -lyophilization
Which of the following is an antiseptic that may be inactivated by some skin bacteria? -
CORRECT ANSWER -Hydrogen peroxide
What is the premise behind pasteurization? - CORRECT ANSWER -It makes products safer to
consume.
Which of the following would be used to sterilize glassware that will be used in a microbiology
lab? - CORRECT ANSWER -Autoclave
Antibiotics such as Streptomycin and Erythromycin stop bacterial infections because they
prevent the bacterial cell from doing which of the following? - CORRECT ANSWER -Assembling
polypeptides
Which of the following is a difference between penicillin and a vancomycin? - CORRECT
ANSWER -Penicillin interferes with an enzyme involved in cell wall synthesis, whereas
vancomycin does not
Semisynthetic antibiotics differ from natural antibiotics because of which of the following? -
CORRECT ANSWER -Natural antibiotics are derived from nature
Which of the following is the difference between soaps and quats? - CORRECT ANSWER -Quats
can kill microbes
Why should meat be thawed in the refrigerator? - CORRECT ANSWER -it will decrease the
possibility of bacteria growth as it thaws
,Antibiotic "A" and antibiotic "B" are both effective at suppressing an infection in a patient,
however together, they have an even more significant effect. This is due to which of the
following? - CORRECT ANSWER -Synergistic interactions
What is the difference between commercial sterilization and sterilization using a sterilant? -
CORRECT ANSWER -A sterilant would be used on a surface
Polymyxin E is useful against gram-negative bacteria because of which of the following? -
CORRECT ANSWER -It breaks down the outer membrane
Which test can determine if a disinfectant is contaminated? - CORRECT ANSWER -In-use test
Dry heat and moist heat differ because of which of the following? - CORRECT ANSWER -Moist
heat penetrates cells more effectively
Using a narrow-spectrum antibiotic is better than a broad-spectrum antibiotic because of which
of the following? - CORRECT ANSWER -Narrow-spectrum antibiotics will have less of a chance of
killing normal microbiota
A person is hiking and runs out of drinking water. They find a stream and decide to use the
chlorine tablets they brought to sanitize the water. This would be a good way to make the water
safe to drink because of which of the following? - CORRECT ANSWER -The chlorine will break up
the molecules of the microbes in the water
When a phlebotomist cleans an area of the skin with alcohol before drawing blood on a patient,
their goal is to do which of the following? - CORRECT ANSWER -Lower the number of bacteria
on the skin
,Why is washing your hands with (non-antibacterial) soap and water an effective way to reduce
bacteria? - CORRECT ANSWER -It is degerming your hands
Which of the following would target Mycobacterium tuberculosis? - CORRECT ANSWER -
Isoniazid
Mouthwash, antibacterial soap, and Lysol are all related because of which of the following? -
CORRECT ANSWER -They contain phenolic compounds
Which of the following would be the least selectively toxic treatment for a bacterial infection? -
CORRECT ANSWER -Polymyxin B
Which of the following would be used to control microbial counts in a liquid that could not be
exposed to heat? - CORRECT ANSWER -Filtration
If a person has athlete's foot, the cream they use to treat it will suppress the mold enough for
the immune defenses to rid the skin of the infection because of which of the following? -
CORRECT ANSWER -The cream is fungistatic
Why can quinolones target bacterial replication? - CORRECT ANSWER -Bacteria have different
enzymes
Which scientist's research showed penicillin was an effective antibiotic in treating infections in
animals? - CORRECT ANSWER -Chain
what microbes can be pathogenic? - CORRECT ANSWER -protozoa, fungi, bacteria, helminths,
viruses
what are most infections caused by? - CORRECT ANSWER -bacteria or viruses
, is illness the same as disease - CORRECT ANSWER -no
what does infection mean? - CORRECT ANSWER -infection means that. person has been
colonized with a microbial population
most bacteria that cause disease in humans are ___ - CORRECT ANSWER -mesophilic
what control microbial growth? - CORRECT ANSWER -heat
how does heat affect cells? - CORRECT ANSWER -denaturation of proteins
the intensity depending on time, temp, and moisture
kill means - CORRECT ANSWER -complete death of a microbe
bactericidal - CORRECT ANSWER -indicated that bacterial population is dead
bacteriostatic - CORRECT ANSWER -this means the population is low and not increasing in size
sterilzation - CORRECT ANSWER -completely kill everything which is not always neccessary
sanitize - CORRECT ANSWER -reduce the population to food safe levels
cooking food can ____ - CORRECT ANSWER -kill most bacteria that will cause infection
