1/13 lecture

Question 1

Cell wall component unique to bacteria:

A. Lipopolysaccharide
B. Teichoic acid
C. Mycolic acid
D. Peptidoglycan

Answer 1

D. Peptidoglycan

Question 2

Acid fast positive staining in Mycobacteria is to the presence of;

A. Lipopolysaccharid
B. Teichoic acid
C. Mycolic acid
D. Peptidoglycan

Answer 2

C. Mycolic acid

Question 3

Which one of the following process is the least likely virulence mechanism in bacteria?

A. Bacterial movement using flagella
B. Bacterial attachment using fimbriae
C. Biofilm production and attachment to surfaces
D. Bacterial protein production by ribosomes

Answer 3

D. Bacterial protein production by ribosomes

Note: Flagella is a virulence factor; fimbriae can attach to receptors in the cell

Question 4

Cell wall component unique to Gram positive bacteria:

A. Lipopolysaccharide
B. Teichoic acid
C. Mycolic acid
D. Peptidoglycan

Answer 4

B. Teichoic acid

Question 5

Cell wall component unique to Gram negative bacteria:

A. Lipopolysaccharide
B. Teichoic acid
C. Mycolic acid
D. Peptidoglycan

Answer 5

A. Lipopolysaccharide

Question 6

Gram positive staining in some bacteria is due to the presence of a;

A. Peptidoglycan layer
B. Teichoic acid
C. A thick peptidoglycan layer
D. Thick outer membrane

Answer 6

C. A thick peptidoglycan layer

Question 7

Gram positive bacterua retains the color of primary stain and gram negative bacteria picks up the color of the counterstain

A. True
B. False

Answer 7

A. True