Microbiology Flashcards
The cell wall of a gram negative organism contains a thick layer of which component?
a. Peptidoglycan
b. Teichoic acid
c. Lipopolysaccharide
d. Chitin
c. Lipopolysaccharide
The prokaryotic cell can be differentiated from eukaryotes by which of the following?
a. Prokaryotes have a nuclear membrane
b. The sexual reproduction of prokaryotes involves meiosis
c. Prokaryotes multiply by binary fission
d. Membrane bound organelles are present in prokaryotes
c. Prokaryotes multiply by binary fission
Although, sabi ni Jawetz, “The distinction between prokaryotes and eukaryotes that still holds is that prokaryotes have no eukaryotic-type mitotic apparatus.”
Lactobacilli is part of the normal flora of the female genital tract. It can inhibit the overgrowth of yeasts such as Candida albicans because it maintains the acidic environment of the vagina. The relationship of both organisms is called
a. Commensalism
b. Antagonism
c. Mutualism
d. Parasitism
b. Antagonism
Neisseria meningitides can cause a serious type of meningitis that can rapidly progress into a systemic infection leading to death. What is responsible for the clinical manifestation of infection?
a. Exotoxin
b. Enterotoxin
c. Endotoxin
d. Neurotoxin
c. Endotoxin
The first immunoglobulin produced in response to an infection is
a. IgA
b. IgG
c. IgG
d. IgM
d. IgM
Bonus, but: “IgM is the earliest specific antibody to appear in response to infection” - HPIM
After several months, a worker of a mushroom farm developed urticaria, edema and swelling of the lymph node. This mechanism is mediated by which of the following?
a. IgE
b. Th cells
c. TD cell
d. IgG and IgM
b. Th cells
Several months – IgE is immediate type. But I’ll get back to you, as I’m not sure about the others.
An endospore is a resting structure found inside some bacteria and contributes to the spread of infection. Which of the following bacteria produce a spore?
a. Clostridium tetani
b. Mycobacterium leprae
c. Staphylococcus aureus
d. Corynebacterium diphtheriae
Clostridium tetani
A bacteria that lacks a cell wall belongs to which class of prokaryotes?
a. Mycoplasma
b. Actinomycetes
c. Archeabacteria
d. Cyanobacteria
Archeabacteria
Streptococci can cause wound infection that may spread from its initial site of inoculation by the action of enzymes digesting the surrounding connective tissue. What enzyme is responsible for this effect?
a. Coagulase
b. Hyaluronidase
c. Fibrinolysin
d. Leukocidin
b. Hyaluronidase
George was rushed to the hospital for fever and pain in the right lower abdomen. Rectal exam was compatible with the diagnosis of appendicitis. He was again rushed to the operating table because of unstable vital signs. On opening up, he was found to have a ruptured appendicitis with abscess formation around it. The exudates later yielded Bacteroides fragilis. Which of the following factors promote abscess formation by B. fragilis?
a. capsule
b. lipopolysaccharide
c. pili
d. superoxide dismutase
a. capsule
You are giving lectures to TB patients about the characteristics of Mycobacterium tuberculosis. This is to convince them that they should cover their mouths when coughing and to avoid spitting in the environment. Which of the following characteristics should not be emphasized to them?
a. The organism is grown in complex media
b. The organism is resistant to drying and survive for long periods in dried sputum
c. The organism is resistant to acid and alkali
d. The organisms are found in the droplet nuclei discharge by the infected person
a. The organism is grown in complex media
