Medical Microbiology Study Guide for the final
Exam Questions and Answers
1. A patient comes into the clinic complaining of frequent coughing
sometimes coughing up blood, fever, night sweats. After receiving a
positive acid-fast stain from a bronchoalveolar lavage sample, the
patient was diagnosed with a disease most likely caused by
Bacillus cereus
Streptococcosu
pneumoniae Mycoplasma
pneumoniae Neisseria
meningitidis
Mycobacterium tuberculosis correct answer: Mycobacterium tuberculosis
2. The following bacteria is responsible for keeping the pH lower in
the vagina, thus minimizing fungal growth. correct answer:
Lactobacillus
3. A bacteria that is lophotrichous means correct answer: they have tuft of flagella
at one end
4. The presence of a blue-green pigment surrounding a colony on
Blood agar plate most likely represents correct answer: Pseudomonas
5. After exposure to lysozyme which breaks down peptidoglycan,
which bacteria is more susceptible to cell death? correct answer:
positive
6. The presence of bile salts in MacConkey
agar serves as a ingre- dient against Gram correct
answer: selective, positive
7. antibodies are known to cross the placenta and provide
protection for the fetus. correct answer: IgG
8. Haemophilus
influenzae is one of the leading causes of pneumonia. Due to its
,capnophilic nature, you should to identify if it is the
etiologic agent? correct answer: incubate with 5% (higher than normal) CO2
9. Pleisomonas Shigelloides correct answer: Is this the correct way
of writing the genus and species respectively? correct answer: False
10. Some nonpathogenic strains of Escherichia coli naturally live in
your gas- trointestinal tract where they produce vitamin K and B-
complex vitamins for the human body. The host provides an
environment to live and nutrients for the bacteria. This is an
example of correct answer: symbiosis
,11. You identified a Gram negative coccobacilli from a colony
isolated on choco- late agar after incubating it at 37°C + 5% CO2 from
CSF of a child suffering with stiff neck, photophobia, and fever.
What is the most likely etiologic agent?
Naegleria fowleri
Neisseria meningitidis
Haemophilus influenzae
Clostridium difficile
Streptococcus pneumonia correct answer: Haemophilus influenzae
12. Most pathogens fall into the which category? correct answer:
mesophile
13. In bacterial genetics, the role of promoter is to
bind to RNA polymerase thus aiding in
translation bind to the repressor, removing it
from the operon bind to RNA polymerase thus
aiding in transcription
Bind to DNA polymerase, inducing it to transcribe correct answer: bind to RNA
polymerase thus aiding in translation
bind to the repressor, removing it from the operon
14. Which bacteria is most likely to be identified as normal
microbiota on the skin? (hint correct answer: if it gets into your
sebaceous glands could cause acne though) correct answer: Pro-
pionibacterium
15. The following cell is best known as a professional phagocyte in
your body correct answer: -
macrophage
16. What test would you perform to distinguish Staphylococcus
aureus from all other staphylococci? correct answer: coagulase
17. A patient came in with a wound infection that stained Gram
positive cocci though it wasn't obvious if they were in chains or
, clusters. What test would you order to differentiate between
Staphylococcus and Streptococcus? correct answer: catalase
18. In the journal Case Reports in Infectious Diseases, they
reported a 67-year old male patient underwent gastroscopy and
colonoscopy for investigational purposed due to a suspicion of
anemia. However, everything appeared normal.
Exam Questions and Answers
1. A patient comes into the clinic complaining of frequent coughing
sometimes coughing up blood, fever, night sweats. After receiving a
positive acid-fast stain from a bronchoalveolar lavage sample, the
patient was diagnosed with a disease most likely caused by
Bacillus cereus
Streptococcosu
pneumoniae Mycoplasma
pneumoniae Neisseria
meningitidis
Mycobacterium tuberculosis correct answer: Mycobacterium tuberculosis
2. The following bacteria is responsible for keeping the pH lower in
the vagina, thus minimizing fungal growth. correct answer:
Lactobacillus
3. A bacteria that is lophotrichous means correct answer: they have tuft of flagella
at one end
4. The presence of a blue-green pigment surrounding a colony on
Blood agar plate most likely represents correct answer: Pseudomonas
5. After exposure to lysozyme which breaks down peptidoglycan,
which bacteria is more susceptible to cell death? correct answer:
positive
6. The presence of bile salts in MacConkey
agar serves as a ingre- dient against Gram correct
answer: selective, positive
7. antibodies are known to cross the placenta and provide
protection for the fetus. correct answer: IgG
8. Haemophilus
influenzae is one of the leading causes of pneumonia. Due to its
,capnophilic nature, you should to identify if it is the
etiologic agent? correct answer: incubate with 5% (higher than normal) CO2
9. Pleisomonas Shigelloides correct answer: Is this the correct way
of writing the genus and species respectively? correct answer: False
10. Some nonpathogenic strains of Escherichia coli naturally live in
your gas- trointestinal tract where they produce vitamin K and B-
complex vitamins for the human body. The host provides an
environment to live and nutrients for the bacteria. This is an
example of correct answer: symbiosis
,11. You identified a Gram negative coccobacilli from a colony
isolated on choco- late agar after incubating it at 37°C + 5% CO2 from
CSF of a child suffering with stiff neck, photophobia, and fever.
What is the most likely etiologic agent?
Naegleria fowleri
Neisseria meningitidis
Haemophilus influenzae
Clostridium difficile
Streptococcus pneumonia correct answer: Haemophilus influenzae
12. Most pathogens fall into the which category? correct answer:
mesophile
13. In bacterial genetics, the role of promoter is to
bind to RNA polymerase thus aiding in
translation bind to the repressor, removing it
from the operon bind to RNA polymerase thus
aiding in transcription
Bind to DNA polymerase, inducing it to transcribe correct answer: bind to RNA
polymerase thus aiding in translation
bind to the repressor, removing it from the operon
14. Which bacteria is most likely to be identified as normal
microbiota on the skin? (hint correct answer: if it gets into your
sebaceous glands could cause acne though) correct answer: Pro-
pionibacterium
15. The following cell is best known as a professional phagocyte in
your body correct answer: -
macrophage
16. What test would you perform to distinguish Staphylococcus
aureus from all other staphylococci? correct answer: coagulase
17. A patient came in with a wound infection that stained Gram
positive cocci though it wasn't obvious if they were in chains or
, clusters. What test would you order to differentiate between
Staphylococcus and Streptococcus? correct answer: catalase
18. In the journal Case Reports in Infectious Diseases, they
reported a 67-year old male patient underwent gastroscopy and
colonoscopy for investigational purposed due to a suspicion of
anemia. However, everything appeared normal.
