Microbiology Toughest Exam: Quiz!

50 Questions | By DrMoodyDDS | Last updated: Jan 20, 2021 | Total Attempts: 93

Questions

Settings

Questions and Answers

1.

Bacteria most likely to cause sepsis.
- A.
  
  E. Coli
- B.
  
  Staph Aureus
- C.
  
  Strep Pyogenes
- D.
  
  Clostridium Difficle
- E.
  
  A and B
- F.
  
  None of the above
2.

Disinfectant effectiveness is determined by killing effectiveness of:
- A.
  
  Mycobactrium Tuberculosis
- B.
  
  Helicobacter Pylori
- C.
  
  Clostridium Difficle
- D.
  
  Bacillus sterothermophillus
3.

The greatest risk of bloodborne infections among healthcare workers:
- A.
  
  Pseudomonas Aeruginosa
- B.
  
  HBV
- C.
  
  HIV
- D.
  
  Mycobacterium Tuberculosis
4.

Peptidoglycan is a cross-linked polysaccharide of:
- A.
  
  N acetylmuramic and N acetylgalatose residues
- B.
  
  N acetylgalactose and N acetylglucosamine residues
- C.
  
  N acetylmuramic and N acetylglucosamine residues
5.

DNA transfer via virus/bacteriophage:
- A.
  
  Translation
- B.
  
  Transduction
- C.
  
  Transposon
- D.
  
  Conjugation
- E.
  
  Transformation
- F.
  
  Transfection
6.

What does Tetanus toxin do?
- A.
  
  Inhibits glycine release
- B.
  
  Inhibits protein synthesis
- C.
  
  Inhibit acetylchonine release
- D.
  
  Promotes cytokine release from t cells
7.

Which toxin promotes cytokine release from t cells?
- A.
  
  Alpha toxin
- B.
  
  Diptheria toxin
- C.
  
  Botulinium toxin
- D.
  
  TSST
8.

What does erythrogenic toxin cause?
- A.
  
  Degrades IgA
- B.
  
  Inhibits complement
- C.
  
  Destroys PMN
- D.
  
  Causes Scarlet Fever
- E.
  
  Causes Scalded Skin Syndrome
9.

What type of hemolysis do Streptolysin O, Streptolysin S, and Pneumolysin cause?
- A.
  
  Alpha- hemolysis (partial)
- B.
  
  Beta - hemolysis (complete)
- C.
  
  Gama - hemolysis (none)
10.

Which of the following is true of endotoxin?
- A.
  
  Located within the bacterial cell membrane
- B.
  
  It is lippopolysaccaride
- C.
  
  Lipid A is the toxic component
- D.
  
  Found only in Gram negative bactria
11.

Which of the following are obligate intracellular bacteria?
- A.
  
  Spirocettes
- B.
  
  Neissera gonorehea
- C.
  
  Rickettisa
- D.
  
  Chlamydia sp.
12.

Which of the following bacteria do not have a rigid and thick cell wall?
- A.
  
  Actinomyces isreales
- B.
  
  Mycoplasma
- C.
  
  Spirocettes
- D.
  
  Salmonella
13.

Which of the following are distinguishing features of Mycobacteria species?
- A.
  
  They stain via acid fast staining
- B.
  
  They lack a cell wall
- C.
  
  Has mycolic acid in its cell wall instead of peptidglycan
14.

What do obligate anaerobes lack which is responsible for they need to live in oxygen-free environments?
- A.
  
  A cell wall
- B.
  
  Factor IX (Christmas factor)
- C.
  
  Glyceraldegyde 6 phosphate dehydrogenase
- D.
  
  Superoxide dismutase and catalase
15.

All Streptococci species are catalase-negative and gram-positive.
- A.
  
  True
- B.
  
  False
16.

Group A Beta Hemolytic Streptococci are distinguished by which of the following:
- A.
  
  M protein on outer surface of cell
- B.
  
  C Carbohydrate composition of cell wall
- C.
  
  None of the above
17.

Which is true of Beta Hemolytic Streptococci:
- A.
  
  All have C Carbohydrate composition of cell wall
- B.
  
  They are also called the Lancefield group
- C.
  
  They undergo beta hemolysis
18.

Which of the following Strep species undergo beta hemolysis?
- A.
  
  Step viridans
- B.
  
  Strep pyogenes
- C.
  
  Strep agalactae
- D.
  
  Strep bovis
- E.
  
  Enterococci
- F.
  
  Strep pnemonae
19.

All Clostridium species are obligate anaerobic.
- A.
  
  True
- B.
  
  False
20.

Which of the following are major virulence factors for Streptococcus pyogenes:
- A.
  
  Protein A
- B.
  
  Hyauronidase
- C.
  
  Streptokinase
- D.
  
  Erythrogenic toxin
- E.
  
  Streptolysin O and S
- F.
  
  Exotoxin O and S
- G.
  
  Beta lactamase
- H.
  
  TSST
- I.
  
  Exfoliatin
- J.
  
  Entrotoxin
21.

Which of the following are major virulence factors for Staphylococcus aureus:
- A.
  
  Protein A
- B.
  
  Hyauronidase
- C.
  
  Staphylokinase
- D.
  
  Beta lactamase
- E.
  
  TSST
- F.
  
  Exfoliatin
- G.
  
  Enterotoxin
22.

Streptococcus pyogenes causes:
- A.
  
  Scarlet Fever
- B.
  
  Toxic Shock Syndrome
- C.
  
  Scalded skin syndrome
- D.
  
  Rheumatic fever
- E.
  
  A and D
- F.
  
  B and C
23.

Stapylococcus aureus causes:
- A.
  
  Scarlet Fever
- B.
  
  Toxic Shock Syndrome
- C.
  
  Scalded skin syndrome
- D.
  
  Rheumatic fever
- E.
  
  A and D
- F.
  
  B and C
24.

Bacterial that causes caries:
- A.
  
  Strep viridans
- B.
  
  Strep pyogenes
- C.
  
  Strep agalactae
- D.
  
  All of the above
25.

Bacteria that have IgA protease:
- A.
  
  Streptococcus pneumoniae
- B.
  
  Haemophilus influenzae
- C.
  
  Neisseria (N. gonorrhoeae, N. meningitidis)
- D.
  
  All of the above