Bacteria 101

1. A capsule or slime layer (glycocalyx) makes a bacteria less virulent.

True

False

2. Which of the following is not a function of the cell wall?

Holds genetic information

Maintenance of cell shape

Prevention of osmotic lysis

Anchor for external structures

Provide environmental protection

3. Which of the following would refer to a "grapelike cluster"?

Strepto-

Sarcina

Staphylo-

Tetrads

Diplo-

4. Most bacterial cell membranes contain sterols.

True

False

5. Gram Positive bacteria does NOT contain which of the following?

Peptidoglycan

Teichoic Acid

Lipid A

Lipoteichoic Acid

Lipid A is found in Gram -

Explanation

Lipid A is found in Gram -

6. Which of the following is NOT an acid fast bacteria?

E. Coli

Mycobacterium tuberculosis

Nocardia asteroides

M. leprae

E.Coli is Gram -

Explanation

E.Coli is Gram -

7. The same bacteria Davy found is swimming toward food. What word below describes his movement?

Chemotaxis

Twitching

Chemotoxicity

Phototrophic

8. Which of the following is essential to bacteria because they lack compartmentalization?

Small surface-to-volume ratio

Large surface-to-volume ratio

Large size

Large volume-to-surface ratio

9. Gram Positive bacteria contain Lipid A that contains toxins that may cause septic shock in a host.

True

False

Lipid A is found in Gram -

Explanation

Lipid A is found in Gram -

10. The A antigen in flagellum is used in typing bacterial isolates.

True

False

Flagellum contain Antigen H

Explanation

Flagellum contain Antigen H

11. Davy is looking at some bacteria under the microscope and he notices that it has 3 flagella at one end that are helping it to swim across the viewing area. This bacteria would be classified as?

Peritrichous

Amphitrichous

Lophotrichous

Monotrichous

Ciliated

12. Which of the following refers to a wavy shape?

Pleomorphic

Coccus

Vibrio

Spirochete

Spirillum

13. Which of the following is NOT true of bacterial ribosomes?

Contain 70S ribosome

Contain 30S subunit

Contain 40S subunit

Contain 50S subunit

40S and 60S subunits combine to make an 80S ribosome in Eukaryotic cells

Explanation

40S and 60S subunits combine to make an 80S ribosome in Eukaryotic cells

14. Which of the following allows you to detect the presence of a capsule when S. pneumoniae is suspected?

Quahog reaction

Quellung reaction

Acid fast reaction

Gram Staining

15. Which of the following are NOT found in Gram Negative bacteria?

Lipopolysaccharide

O antigen

Trimeric Porins

Lipid A

H antigen

H antigen is found in the flagellum

Explanation

H antigen is found in the flagellum

16. Which of the following is NOT a function of pili?

Bind to sugars using lectins

Twitching

Secreted slime layer

Adhesion to a host cell

Exchanging DNA

17. Which of the following refers to a short rod?

Coccus

Bacillus

Vibrio

Coccobacillus

Spirillum

18. What structure in Gram Negative bacteria serves as a stabilizer for the outer membrane?

Teichoic Acid

Mycolic Acid

Lipoprotein

Lipopolysaccharide

Periplasmic Space

19. What stain is used for acid fast bacteria? May choose more than one.

Ziehl-Neehlson Stain

Gram Stain

Carbol fuchsin dye

Methylene Blue

PAS

Gram stain determines Gram + or Gram -, and PAS is used in Fungi and other carbohydrate containing organisms

Explanation

Gram stain determines Gram + or Gram -, and PAS is used in Fungi and other carbohydrate containing organisms

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20. Which of the following does a bacterial cell wall contain?

Chitin

Peptidoglycan

Cellulose

Erogosterol

Mannan