Bacterial Morphology and Structure Practice Questions

Question 1

The following pathogen does not satisfy 'Koch's postulates'-

Accepted Answer

Lepra bacilli

Answer

Clostridium tetani

Answer

Mycobacterium tuberculosis

Answer

Bacillus anthracis

Question 2

Negative staining is used to demonstrate

Accepted Answer

Bacterial capsule

Answer

Bacterial fimbriae

Answer

Bacterial spore

Answer

Bacterial flagella

Question 3

Which of the following bacteria is microaerophilic?

Accepted Answer

Campylobacter

Answer

Pseudomonas

Answer

Salmonella

Answer

Vibrio cholerae

Question 4

Fever, leukopenia, disseminated intravascular coagulation, and hypotension caused by members of the Enterobacteriaceae family are most strongly associated with which of the following structures?

Accepted Answer

Lipid A

Answer

Polysaccharides

Answer

H antigens (flagellar antigens)

Answer

K antigens (capsular antigens)

Question 5

Staphylococcus is a type of:

Accepted Answer

Gram-positive cocci

Answer

Gram-negative cocci

Answer

Gram-positive bacillus

Answer

Gram-negative bacillus

Question 6

Which of the following is the MOST CHARACTERISTIC feature of Campylobacter?

Accepted Answer

Comma-shaped

Answer

Non-motile

Answer

Encapsulated

Answer

Spore-forming

Question 7

All are true about Helicobacter pylori on special stain preparation of stomach except:

Accepted Answer

S shaped non-flagellated bacteria

Answer

Steiner stain preparation

Answer

Dormant stage is coccoid form

Answer

Attaches but does not invade the cells

Question 8

In nutrient agar the concentration of agar is

Accepted Answer

1.5%

Answer

1%

Answer

3%

Answer

4%

Question 9

Gram stain shows branching filaments. Culture shows sulfur granules and grows in CO2. Which organism?

Accepted Answer

Actinomyces

Answer

Streptomyces

Answer

Nocardia

Answer

Aspergillus

Question 10

A patient presented with meningitis, and the CSF sample shows Gram-negative diplococci on Gram staining and microscopy. Which of the following features/tests will be characteristic of the organism?

Accepted Answer

Oxidase positive, catalase positive, ferments glucose and maltose

Answer

Catalase negative, optochin sensitive, alpha-hemolytic

Answer

Oxidase negative, catalase positive, coagulase positive

Answer

Catalase positive, urease positive, does not ferment glucose

Bacterial Morphology and Structure — MCQs

Bacterial Morphology and Structure — MCQs

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