Microbiology Exam 3 - Rio Salado Questions With
Complete Solutions
/. Which method can be used for long-term storage? - Answer-lyophilization
/.Which of the following is an antiseptic that may be inactivated by some skin bacteria? -
Answer-Hydrogen peroxide
/.What is the premise behind pasteurization? - 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? - Answer-Autoclave
/.Antibiotics such as Streptomycin and Erythromycin stop bacterial infections because
they prevent the bacterial cell from doing which of the following? - Answer-Assembling
polypeptides
/.Which of the following is a difference between penicillin and a vancomycin? - 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? - Answer-Natural antibiotics are derived from nature
/.Which of the following is the difference between soaps and quats? - Answer-Quats can
kill microbes
/.Why should meat be thawed in the refrigerator? - 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? - Answer-Synergistic interactions
/.What is the difference between commercial sterilization and sterilization using a
sterilant? - Answer-A sterilant would be used on a surface
/.Polymyxin E is useful against gram-negative bacteria because of which of the
following? - Answer-It breaks down the outer membrane
/.Which test can determine if a disinfectant is contaminated? - Answer-In-use test
,/.Dry heat and moist heat differ because of which of the following? - 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? - 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? - 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? - 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? - Answer-It is degerming your hands
/.Which of the following would target Mycobacterium tuberculosis? - Answer-Isoniazid
/.Mouthwash, antibacterial soap, and Lysol are all related because of which of the
following? - Answer-They contain phenolic compounds
/.Which of the following would be the least selectively toxic treatment for a bacterial
infection? - Answer-Polymyxin B
/.Which of the following would be used to control microbial counts in a liquid that could
not be exposed to heat? - 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? - Answer-The cream is fungistatic
/.Why can quinolones target bacterial replication? - Answer-Bacteria have different
enzymes
/.Which scientist's research showed penicillin was an effective antibiotic in treating
infections in animals? - Answer-Chain
/.what microbes can be pathogenic? - Answer-protozoa, fungi, bacteria, helminths,
viruses
/.what are most infections caused by? - Answer-bacteria or viruses
/.is illness the same as disease - Answer-no
, /.what does infection mean? - Answer-infection means that. person has been colonized
with a microbial population
/.most bacteria that cause disease in humans are ___ - Answer-mesophilic
/.what control microbial growth? - Answer-heat
/.how does heat affect cells? - Answer-denaturation of proteins
the intensity depending on time, temp, and moisture
/.kill means - Answer-complete death of a microbe
/.bactericidal - Answer-indicated that bacterial population is dead
/.bacteriostatic - Answer-this means the population is low and not increasing in size
/.sterilzation - Answer-completely kill everything which is not always neccessary
/.sanitize - Answer-reduce the population to food safe levels
/.cooking food can ____ - Answer-kill most bacteria that will cause infection
/.S. aureus - Answer-can replicate and produce toxins that will remain after the food Is
heated if the toxin is in/on the food prior to cooking
/.Clostridium botulinum - Answer-toxin that can be ingested and cause sever disease
remains dormant until activated
toxins will cause paralysis of muscles, including muscles that control breathing
/.pasteruization - Answer-reducing microbial counts in milk because sterilization would
denature all proteins in milk, reducing its nutritional value
required to be refrigerated after and can go bad bc bacteria may be present after the
process
/.freezing - Answer-a way of food preservation and can be accompanied by other
physical and chemical methods of control
/.how does adding salt and sugar help with freezing items - Answer-it creates a
hypertonic environment that suppresses the growth of organisms that are not halophiles
/.nitrites - Answer-used as a preservative in deli meats, can be carcinogenic
Complete Solutions
/. Which method can be used for long-term storage? - Answer-lyophilization
/.Which of the following is an antiseptic that may be inactivated by some skin bacteria? -
Answer-Hydrogen peroxide
/.What is the premise behind pasteurization? - 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? - Answer-Autoclave
/.Antibiotics such as Streptomycin and Erythromycin stop bacterial infections because
they prevent the bacterial cell from doing which of the following? - Answer-Assembling
polypeptides
/.Which of the following is a difference between penicillin and a vancomycin? - 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? - Answer-Natural antibiotics are derived from nature
/.Which of the following is the difference between soaps and quats? - Answer-Quats can
kill microbes
/.Why should meat be thawed in the refrigerator? - 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? - Answer-Synergistic interactions
/.What is the difference between commercial sterilization and sterilization using a
sterilant? - Answer-A sterilant would be used on a surface
/.Polymyxin E is useful against gram-negative bacteria because of which of the
following? - Answer-It breaks down the outer membrane
/.Which test can determine if a disinfectant is contaminated? - Answer-In-use test
,/.Dry heat and moist heat differ because of which of the following? - 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? - 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? - 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? - 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? - Answer-It is degerming your hands
/.Which of the following would target Mycobacterium tuberculosis? - Answer-Isoniazid
/.Mouthwash, antibacterial soap, and Lysol are all related because of which of the
following? - Answer-They contain phenolic compounds
/.Which of the following would be the least selectively toxic treatment for a bacterial
infection? - Answer-Polymyxin B
/.Which of the following would be used to control microbial counts in a liquid that could
not be exposed to heat? - 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? - Answer-The cream is fungistatic
/.Why can quinolones target bacterial replication? - Answer-Bacteria have different
enzymes
/.Which scientist's research showed penicillin was an effective antibiotic in treating
infections in animals? - Answer-Chain
/.what microbes can be pathogenic? - Answer-protozoa, fungi, bacteria, helminths,
viruses
/.what are most infections caused by? - Answer-bacteria or viruses
/.is illness the same as disease - Answer-no
, /.what does infection mean? - Answer-infection means that. person has been colonized
with a microbial population
/.most bacteria that cause disease in humans are ___ - Answer-mesophilic
/.what control microbial growth? - Answer-heat
/.how does heat affect cells? - Answer-denaturation of proteins
the intensity depending on time, temp, and moisture
/.kill means - Answer-complete death of a microbe
/.bactericidal - Answer-indicated that bacterial population is dead
/.bacteriostatic - Answer-this means the population is low and not increasing in size
/.sterilzation - Answer-completely kill everything which is not always neccessary
/.sanitize - Answer-reduce the population to food safe levels
/.cooking food can ____ - Answer-kill most bacteria that will cause infection
/.S. aureus - Answer-can replicate and produce toxins that will remain after the food Is
heated if the toxin is in/on the food prior to cooking
/.Clostridium botulinum - Answer-toxin that can be ingested and cause sever disease
remains dormant until activated
toxins will cause paralysis of muscles, including muscles that control breathing
/.pasteruization - Answer-reducing microbial counts in milk because sterilization would
denature all proteins in milk, reducing its nutritional value
required to be refrigerated after and can go bad bc bacteria may be present after the
process
/.freezing - Answer-a way of food preservation and can be accompanied by other
physical and chemical methods of control
/.how does adding salt and sugar help with freezing items - Answer-it creates a
hypertonic environment that suppresses the growth of organisms that are not halophiles
/.nitrites - Answer-used as a preservative in deli meats, can be carcinogenic
