MEDICAL MICROBIOLOGY EXAM PRACTICE QUESTIONS AND CORRECT
ANSWERS| A+ GRADED |GUARANTEED PASS!!
1) Which of the following microorganism is the major inhabitant of the human skin? a) Escherichia
coli b) Staphylococcus epidermidis c) Staphylococcus aureus d) Streptococcus pyogenes -
ANSWER b
2) Select all the medically important bacteria which are frequently isolated as a major pathogen of
human infections? a) Enteric bacteria b) Pseudomonas spp c) Plasmodium spp d) Staphylococcus
spp e) Mucor spp f) Mycobacterium spp - ANSWER a, b, d, f
3) All of the following pathogens can cause congenital infections that are transmitted from infected
mother to baby, Except? a) Treponema pallidum b) Zika virus c) Herpesvirus d) Clostridium
perfringens - ANSWER d
4) Which of the following cocci-shaped bacteria usually grow in pairs? a) Klebsiella spp b) Neisseria
spp c) Pseudomonas spp d) Clostridium spp e) Nocardia spp - ANSWER b
5) Which of the following microbe can live only inside the cell (obligate intracellular pathogen)? a)
Salmonella b) Mycobacterium c) Rickettsia d) Vibrio - ANSWER c
6) ..................................... is the normal flora of the upper respiratory tract of the human body a)
Lactobacillus spp b) Staphylococcus spp c) Vibrio spp d) None of the above - ANSWER b
7) Which of the following bacteria releases an endotoxin that causes muscular paralysis? a)
Clostridium botulism b) Bacillus cereus c) Streptococcus pyogenes d) Salmonella typhi - ANSWER
a
8) Staphylococcus spp produces which of the following enzyme? a) Proteases b) Lipase c)
Hyaluronidase d) Coagulase - ANSWER d
9) Which of the following bacteria is predominantly present in the urogenital flora of a mother and
a newborn female infant? a) Candida albicans b) Lactobacillus acidophilus c) Escherichia coli d)
Neisseria gonorrohea - ANSWER b
,10) All of the following bacteria are the predominant normal flora of human feces, EXCEPT a)
Pseudomonas sps b) Bacteroides sps c) Enterococcus sps d) Bacillus sps - ANSWER a
11) Name the pathogen transmitted to humans by the bite of fleas that can cause a serious and
deadly infection a) Salmonella typhi b) Yersinia pestis c) Shigella dysenteriae d) Escherichia coli -
ANSWER b
12) Which toxin is produced by Streptococcus pyogenes? a) Shiga like toxin b) Alpha toxin c)
Erythrogenic toxin d) Cyanotoxin - ANSWER c
13) Name the bacteria that is a common cause of toxic shock syndrome a) Staphylococcus
epidermidis b) Staphylococcus aureus c) Staphylococcus intermedius d) None of the above -
ANSWER b
14) Catalase test is the common biochemical test used for the identification of various bacteria.
Which of the following bacteria does not have this enzyme? a) Enterobacter b) Pseudomonas c)
Corynebacterium d) Streptococci - ANSWER d
15) Staphylococcus aureus releases various types of toxins that increase the virulence of the
bacteria, Select all the toxins released by S.aureus: a) Aflatoxin b) Mycotoxin c) Leucocidin d)
Enterotoxin - ANSWER c, d
16) Which pathogen is a major cause of dental disease? a) Staphylococcus epidermidis b)
Streptococcus mutans c) Staphylococcus aureus d) Streptococcus agalactiae - ANSWER b
17) The microorganism that commonly causes an eye infection is a) Chlamydia trachomatis b)
Staphylococcus aureus c) Streptococcus pneumoniae d) Streptococcus sanguinis - ANSWER a
18) The most significant bacteria found in acne is .............................acnes. a) Staphylococcus b)
Streptococcus c) Propionibacterium d) Bacillus - ANSWER c
, 19) Which of the following bacteria is predominantly present as normal flora in urine? a) Escherichia
coli b) Staphylococcus epidermidis c) Staphylococcus aureus d) Streptococcus pyogenes -
ANSWER a
20) ) The virulence factors of a bacteria are the important constituents of the bacteria that help in
invading the host and initiating the infection. Select all the important virulence factors which
help in the process of bacterial pathogenesis: a)Siderophores b)Exotoxins and endotoxins c)Pili/
fimbriae d)Capsules e) All of the above - ANSWER a, b, c ,d
21) Name the most possible bacteria associated with the opportunistic infections that occur in
patients who have cystic fibrosis a) Staphylococcus aureus b) Pseudomonas aeruginosa c)
Chlamydia trachomatis d) Candida albicans - ANSWER b
22) Select all the microorganisms which are commonly transmitted to humans by the vectors such as
ticks and fleas. a) Rickettsia spp b) Yersinia spp c) Borrelia spp d) Bacillus spp - ANSWER a, b, c
23) Which of the following toxins releasing bacteria are common worldwide human gastroenteritis
pathogens? a) Salmonella typhii b) Streptococcus pneumoniae c) Cryptococcus neoformans d)
Clostridium botulinum - ANSWER a
24) Name the possible pathogen that can invade the skin and cause tissue damage in humans a)
E.coli b) Bacillus cereus c) Clostridium perfringens d) Proteus mirabilis - ANSWER c
25) Which of the following microorganism has the cocci cell shapes and sizes arranged usually in
tetrad structures? a) Streptococcus pneumoniae b) Staphylococcus aureus c) Chlamydia
trachomatis d) Neisseria meningitidis - ANSWER a
26) What are the different growth morphology and cell structures used for the classification of
fungi? Select all the correct answers: a) Yeast b) Mold c) Mycelia d) Protozoa - ANSWER a, b , c
27) Which of the following RNA virus is a highly contagious respiratory pathogen that can easily
spread from person to person? a) Coronavirus b) Dengue virus c) Epstein Barr virus d) Hepatitis B
virus - ANSWER a
ANSWERS| A+ GRADED |GUARANTEED PASS!!
1) Which of the following microorganism is the major inhabitant of the human skin? a) Escherichia
coli b) Staphylococcus epidermidis c) Staphylococcus aureus d) Streptococcus pyogenes -
ANSWER b
2) Select all the medically important bacteria which are frequently isolated as a major pathogen of
human infections? a) Enteric bacteria b) Pseudomonas spp c) Plasmodium spp d) Staphylococcus
spp e) Mucor spp f) Mycobacterium spp - ANSWER a, b, d, f
3) All of the following pathogens can cause congenital infections that are transmitted from infected
mother to baby, Except? a) Treponema pallidum b) Zika virus c) Herpesvirus d) Clostridium
perfringens - ANSWER d
4) Which of the following cocci-shaped bacteria usually grow in pairs? a) Klebsiella spp b) Neisseria
spp c) Pseudomonas spp d) Clostridium spp e) Nocardia spp - ANSWER b
5) Which of the following microbe can live only inside the cell (obligate intracellular pathogen)? a)
Salmonella b) Mycobacterium c) Rickettsia d) Vibrio - ANSWER c
6) ..................................... is the normal flora of the upper respiratory tract of the human body a)
Lactobacillus spp b) Staphylococcus spp c) Vibrio spp d) None of the above - ANSWER b
7) Which of the following bacteria releases an endotoxin that causes muscular paralysis? a)
Clostridium botulism b) Bacillus cereus c) Streptococcus pyogenes d) Salmonella typhi - ANSWER
a
8) Staphylococcus spp produces which of the following enzyme? a) Proteases b) Lipase c)
Hyaluronidase d) Coagulase - ANSWER d
9) Which of the following bacteria is predominantly present in the urogenital flora of a mother and
a newborn female infant? a) Candida albicans b) Lactobacillus acidophilus c) Escherichia coli d)
Neisseria gonorrohea - ANSWER b
,10) All of the following bacteria are the predominant normal flora of human feces, EXCEPT a)
Pseudomonas sps b) Bacteroides sps c) Enterococcus sps d) Bacillus sps - ANSWER a
11) Name the pathogen transmitted to humans by the bite of fleas that can cause a serious and
deadly infection a) Salmonella typhi b) Yersinia pestis c) Shigella dysenteriae d) Escherichia coli -
ANSWER b
12) Which toxin is produced by Streptococcus pyogenes? a) Shiga like toxin b) Alpha toxin c)
Erythrogenic toxin d) Cyanotoxin - ANSWER c
13) Name the bacteria that is a common cause of toxic shock syndrome a) Staphylococcus
epidermidis b) Staphylococcus aureus c) Staphylococcus intermedius d) None of the above -
ANSWER b
14) Catalase test is the common biochemical test used for the identification of various bacteria.
Which of the following bacteria does not have this enzyme? a) Enterobacter b) Pseudomonas c)
Corynebacterium d) Streptococci - ANSWER d
15) Staphylococcus aureus releases various types of toxins that increase the virulence of the
bacteria, Select all the toxins released by S.aureus: a) Aflatoxin b) Mycotoxin c) Leucocidin d)
Enterotoxin - ANSWER c, d
16) Which pathogen is a major cause of dental disease? a) Staphylococcus epidermidis b)
Streptococcus mutans c) Staphylococcus aureus d) Streptococcus agalactiae - ANSWER b
17) The microorganism that commonly causes an eye infection is a) Chlamydia trachomatis b)
Staphylococcus aureus c) Streptococcus pneumoniae d) Streptococcus sanguinis - ANSWER a
18) The most significant bacteria found in acne is .............................acnes. a) Staphylococcus b)
Streptococcus c) Propionibacterium d) Bacillus - ANSWER c
, 19) Which of the following bacteria is predominantly present as normal flora in urine? a) Escherichia
coli b) Staphylococcus epidermidis c) Staphylococcus aureus d) Streptococcus pyogenes -
ANSWER a
20) ) The virulence factors of a bacteria are the important constituents of the bacteria that help in
invading the host and initiating the infection. Select all the important virulence factors which
help in the process of bacterial pathogenesis: a)Siderophores b)Exotoxins and endotoxins c)Pili/
fimbriae d)Capsules e) All of the above - ANSWER a, b, c ,d
21) Name the most possible bacteria associated with the opportunistic infections that occur in
patients who have cystic fibrosis a) Staphylococcus aureus b) Pseudomonas aeruginosa c)
Chlamydia trachomatis d) Candida albicans - ANSWER b
22) Select all the microorganisms which are commonly transmitted to humans by the vectors such as
ticks and fleas. a) Rickettsia spp b) Yersinia spp c) Borrelia spp d) Bacillus spp - ANSWER a, b, c
23) Which of the following toxins releasing bacteria are common worldwide human gastroenteritis
pathogens? a) Salmonella typhii b) Streptococcus pneumoniae c) Cryptococcus neoformans d)
Clostridium botulinum - ANSWER a
24) Name the possible pathogen that can invade the skin and cause tissue damage in humans a)
E.coli b) Bacillus cereus c) Clostridium perfringens d) Proteus mirabilis - ANSWER c
25) Which of the following microorganism has the cocci cell shapes and sizes arranged usually in
tetrad structures? a) Streptococcus pneumoniae b) Staphylococcus aureus c) Chlamydia
trachomatis d) Neisseria meningitidis - ANSWER a
26) What are the different growth morphology and cell structures used for the classification of
fungi? Select all the correct answers: a) Yeast b) Mold c) Mycelia d) Protozoa - ANSWER a, b , c
27) Which of the following RNA virus is a highly contagious respiratory pathogen that can easily
spread from person to person? a) Coronavirus b) Dengue virus c) Epstein Barr virus d) Hepatitis B
virus - ANSWER a
