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Micro midterm.pdf
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Exam of 18 pages for the course Dental Hygiene Oxford College Semester I at Dental Hygiene Oxford College Semester I (Micro midterm.pdf)
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Not microbiologyWhich one of the following structures is considered as microbial filter?
Alveolus
Islets of Langerhans
Lymph node
Liver
Based on what type of classification are streptococci classified into 20 groups?
Lancefield
Lister
Gram
Koch
Which one of the following options is the smallest RNA virus?
Togavirus
Paramyxovirus
Retrovirus
Picornavirus
Which group is correct?
1. Immunoglobulins: IgG, IgS and IgM
2. T cells: TD, TH, TA
3. Active immunization: Live vaccine and inactivated vaccine
4. Lymphocytes: B, T and P
4
2
1
3
Which one of the following statements best describes “exotoxins”?
They cause shock and hypotension.
They are produced by both gram positive and negative bacteria.
They are made of LPS (lipopolysaccharide).
They are not actively released from bacteria unless they die.
,Kuru, which is a consequence of human brain consumption, is a typical case of what type
of infection?
Slow
Opportunistic
Oncogenic
Fulminant
Case scenario:
Niraj, a 73-year-old man presents with redness confined to the corners of his mouth. He wears
dentures. Exam reveals fissuring and crusting at the angles of the mouth, with palatal
erythema. Microbiological studies confirmed gram-positive cluster-like cocci from the lesions.
This bacterium is highly transmissible via fingertips and hands. Further microbial culture has
confirmed high level of resistance to routine antibiotics.
What is the most likely diagnosis for this microbial infection?
Angular cheilitis
Fever blisters
Impetigo
Fifth disease
Which of the following bacteria is the causative agent of impetigo?
Bacillus anthracis
Clostridium perfringens
Lactobacillus acidophilus
Streptococcus pyogenes
Which one of the following terms refers to immunoglobulin?
Immunogen
Antigen
Antibody
Antiserum
Which one of the following toxins is secreted from an anaerobic, spore-forming bacterium
and prevents release of the inhibitory neurotransmitter?
Cholera
Pertussis
Diphtheria
Tetanus
, Which one of the following bacteria is a gram-positive, facultative anaerobic which can
cause dental caries and deep carious lesions?
Actinomyces
Haemophilus
Lactobacillus
Porphyromonas
What type of immunoglobulin is a pentamer?
IgE
IgA
IgG
IgM
Which of the following statements are appropriately related to the immune system?
1) T suppressors alleviate the immune response.
2) IgG is a dimer molecule present in mother’s milk.
3) Each antibody has two light and two heavy chains.
4) Major phagocytic cells are PMNs and macrophages.
1 and 2
2, 3, and 4
1, 3, and 4
4 only
Which one of the following T cells kills tumor as well as virus-infected cells, and is
characterizes as CD8+?
TD
TC
TH
TS
Food poisoning is caused by which one of the following toxins?
Epidermolytic toxin
Cytotoxin
Neurotoxin
Enterotoxin
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