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Microbiology PRC 2007 Flashcards

0
Q

The virus plaque is analogous to the

A

Bacterial colony

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1
Q

The release of viral progeny of naked viruses is usually through:

A

Cell lysis

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2
Q

What do you call the stage of growth where there is a slow loss of cells through death that is just balanced by the formation of new cells through growth and division?

A

Maximum stationary

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3
Q

Viropexis is a process of penetration and is a term used to describe:

A

Membrane fusion

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4
Q

Tinea versicolor is a superficial skin infection characterized by hypopigmented areas. The causative fungi is:

A

Malasezzia furfur

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5
Q

What specimen should not be refrigerated after collection even if it cannot be processed at once?

A

Blood

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6
Q

Changes in the regulation of cellular gene expression may occur following infection with:

A

Oncogenic viruses

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7
Q

A 30 year old man had knee surgery following a car accident. A few days after the surgery, the suture line was noted to be infected. Lab report showed gram positive coccus, coagulase positive, catalase positive Beta hemolytic. The organism is:

A

Staphylococcus aureus

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8
Q

A 45 year old male was complaining of on and off epigastric pain. The gastroenterologist had a gastroscopy and demonstrated gastritis histologically and Giemsa stains showed curved spiral organisms and are gram negative. This organism is:

A

Salmonella

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9
Q

The staphylococci produce a toxin which is responsible for the staphylococcal scalded syndrome, Ritter’s disease. This resides in:

A

Exfoliation

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10
Q

CSF is collected in three vials for laboratory examination. Which vial should not be used for bacteriology?

A

Vial 1

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11
Q

Koplik’s spots are pathognomonic of:

A

Measles

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12
Q

The most common infection due to beta hemolytic streptococcus is:

A

Scarlet fever

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13
Q

In general, viruses that are medically important are considered biosafety level?

A

2

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14
Q

There are four important genera of gram positive rods (Corynebacterium, Clostridium, Listeria, Basifica). Which is anaerobic?

A

Listeria

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15
Q

A 30 year old woman undergoing chemotherapy for acute lymphocytic leukemia came to the OPD complaining of small vesicular eruptions across her left breast. The eruptions progressed to ulceration and crusted pustules. She has a similar experience about a year before. This person could be suffering from:

A

Shingles

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16
Q

The first virus discovered was

A

Tobacco mosaic virus

17
Q

The release of progeny enveloped viruses usually involve

A

Budding

18
Q

What fungal disease presents with raised colored cauliflower like lesions and with sclerotic bodies in tissue specimens

A

Chromomycosis

19
Q

The essential antigen in pneumococcus that protects the organism from phagocytosis and is used to classify into specific antigenic types is

A

Capsular polysaccharide

20
Q

A 22 year old male complained of sore throat with fever and lymphadenopathy. There is lymphocytosis with atypical cells in sheep cell agglutination. The probable diagnosis is

A

Infectious mononucleosis

21
Q

A 42 year old post kidney transplant patient developed fever and pneumonia with marked neutropenia. Bronchial washings showed dichotomously branching filamentous fungi. The fungi involved is

A

Chlamydia

22
Q

A 30 year old male has been receiving clindamycin for an aerobic infection. He developed intractable diarrhea with abdominal pain. Colonoscopy showed yellow white pseudomembrane and an exotoxin was identified in the stool. We are probably dealing with?

A

Clostridium difficiae

23
Q

The incubation period of influenza is commonly

A

2-4 days

24
Q

The morphological unit of the virus that can be seen with the electron microscope

A

Capsomer

25
Q

Cellular infection may occur following infection with

A

Oncygenic viruses

26
Q

A 12 year old girl came to the dermatology clinic complaining of scaly patches on the scalp and the hair fluoresced under Woods light. The mother has several Siamese cats and 2 spirz dogs in the household. What is your most likely agent?

A

Microsporum canis

27
Q

A bacteriophage is a virus that infects

A

Prokaryotic cells

28
Q

The etiologic agent of about 90% of post-transfusion hepatitis is

A

Hepatitis C

29
Q

A 20 year old female patient came to you complaining of profuse vaginal discharge with fishy odor and itching of the vulva. Examination of the discharge showed vaginal epithelial cells that contain tiny pleomorphic bacilli within the cytoplasm (clue cells). The pathogen involved is

A

Gardnerella vaginalis

30
Q

The influenza virus attaches to this receptor on host cells

A

Glycophorin molecule

31
Q

A 22 year old male athlete consulted for skin lesions in the arms and trunk which appeared annular with borders containing vesicles. Scrapings was positive for typical hyphae under KOH preparation. Culture in Saboraud’s agar developed typical hyphae and conidia. Your diagnosis would be

A

Tinea corporis

32
Q

The mot frequently isolated type of H. Influenza in cases of bacterial meningitis in children between 6 months to 2 years is

A

Stereotype b: PRP

33
Q

A zone of lysis/cell-inhibition caused by virus infection of a lawn of sensitive cells

A

Plaque

34
Q

Subcutaneous mycoses are found worldwide and the organisms are common soil saprophytes. Through which route will these agents of subcutaneous mycoses be introduced to the host?

A

Traumatic implantation

35
Q

Herpes zoster produces eruptions that are basically unilateral and confined to one or more sensory dermatomes. Which is the most frequently involved?

A

Dorsal nerve of the trunk

36
Q

Blue green pus in wounds and burns is due to

A

Pseudomonas aeruginosa

37
Q

What appendage is involved in the transfer of DNA during bacterial conjugation

A

Pili

38
Q

What causes a subcutaneous fungal disease characterized by swelling of the sinus tracts with presence of sulfur granules?

A

Mycetoma

39
Q

DNA viruses generally replicate in which part of the cell?

A

Nucleus of host cells

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